top of page
Craig Kirkman The Repair Specialist official website.jpg
Home: Welcome

WELCOME 

Here you will find Free help Download Leaflets and Free Educational Video's that will help provide you with a deeper understanding of mechanical and related technical issues. 


Please take a moment to look round my site.


Many thanks indeed. Craig

Home: Text
The Chainsaw's  'T'  Adjuster Screw - This is what it Does!
00:53
TheRepairSpecialist

The Chainsaw's 'T' Adjuster Screw - This is what it Does!

The T idling screw in a two-stroke chainsaw carburetor is essential for adjusting the engine's idle speed. The T screw, also referred to as the idle speed adjustment screw, enables users to modify the throttle plate position while the engine is idling, regulating the quantity of air that enters the engine. The engine's idle speed can be increased by slightly opening the throttle plate by rotating the T screw in a clockwise direction. On the other hand, lowering the idle speed by rotating the screw anticlockwise closes the throttle plate. Maintaining a steady and dependable idle speed, guaranteeing smooth performance, and avoiding stalling when the chainsaw is not in use all depend on the T idling screw being adjusted properly. Furthermore, reducing pollutants and maximising fuel efficiency during idle times depend heavily on the T idling screw adjustment. Chainsaw operators may guarantee that the engine runs at an ideal fuel-to-air mixture ratio while idling, minimising fuel consumption and exhaust pollutants, by fine-tuning the idle speed with the T screw. By minimising the wear and tear on internal components brought on by excessive idling or stalling, a properly regulated idle speed also contributes to an extended engine's lifespan. To preserve optimal engine performance and reduce their impact on the environment, chainsaw owners should check and adjust the T idle screw on a regular basis in accordance with manufacturer instructions. What is the 'Kirkman' Educational Carburetor Model? The 'Kirkman' Educational Carburettor Model, conceived in the United Kingdom, by a British Engineer called Craig Kirkman, was ingeniously designed to demystify the intricate workings of two-stroke carburetors, offering a simplified approach to understanding their functionality. The 'Kirkman' Educational Carburettor Model is not a physical, tangibly built and functioning carburetor. This model must not be confused with the Kirkman Carburetor, which is a carburetor model developed by the American engineer William Kirkman in the early 20th century. Instead, the 'Kirkman' Educational Carburettor Model is a theoretical concept, and teaching model, which consists of a drawing and explanation of a 2-stroke carburetor, which was designed by Craig Kirkman himself. Kirkman, A City and Guilds qualified repair engineer with a BSc Hons degree in Science and a Post Graduate Certificate, unveiled his innovative carburetor model to the public through his YouTube channel, aptly named 'The Repair Specialist', in 2016. Through his channel, Kirkman endeavors to elucidate complex repair concepts to a wide audience, and the 'Kirkman' Theoretical Education Carburettor Model serves as a prime example of his commitment to educational clarity. With a keen focus on accessibility and comprehensibility, Kirkman commonly employs his 'Kirkman' Educational Carburettor Model as a didactic tool, breaking down the intricacies of two-stroke carburetor systems in a manner that enthusiasts and novices alike can readily grasp. Have a Great Day Craig (Owner and Creator of The Repair Specialist Channel)
Chainsaw's  'L'  Adjuster Screw - You Will Finally this!
00:57
TheRepairSpecialist

Chainsaw's 'L' Adjuster Screw - You Will Finally this!

At low engine speeds, the air-fuel mixture is regulated by the L screw on a two-stroke chainsaw carburetor. Known as the low-speed adjustment screw, the L screw regulates fuel flow when operating at idle and low RPM. When the L screw is adjusted correctly, the engine will idle smoothly, respond to throttle inputs, and function consistently at lower speeds. The L screw can be turned clockwise or anticlockwise to enrich the air-fuel mixture and increase the fuel-to-air ratio or to lean the mixture out and decrease the fuel content. Optimising engine efficiency and avoiding problems like engine stalling or rough idling during low-speed operation depend on fine-tuning the L screw. The fuel-to-air ratio rises when the L screw is turned clockwise because it enriches the air-fuel combination; the fuel content decreases when the screw is turned anticlockwise. To maximise engine performance and avoid problems like engine stalling or rough idling while operating at low speeds, fine-tuning the L screw is essential. In order to maximise fuel economy and minimise environmental effect, the engine must get the proper amount of fuel for combustion, which is ensured by properly calibrated L screw settings. Users of chainsaws must carefully adjust the L screw in accordance with operating conditions and manufacturer requirements in order to preserve engine performance at its best and comply with emissions regulations. What is the 'Kirkman' Educational Carburetor Model? The 'Kirkman' Educational Carburettor Model, conceived in the United Kingdom, by a British Engineer called Craig Kirkman, was ingeniously designed to demystify the intricate workings of two-stroke carburetors, offering a simplified approach to understanding their functionality. The 'Kirkman' Educational Carburettor Model is not a physical, tangibly built and functioning carburetor. This model must not be confused with the Kirkman Carburetor, which is a carburetor model developed by the American engineer William Kirkman in the early 20th century. Instead, the 'Kirkman' Educational Carburettor Model is a theoretical concept, and teaching model, which consists of a drawing and explanation of a 2-stroke carburetor, which was designed by Craig Kirkman himself. Kirkman, A City and Guilds qualified repair engineer with a BSc Hons degree in Science and a Post Graduate Certificate, unveiled his innovative carburetor model to the public through his YouTube channel, aptly named 'The Repair Specialist', in 2016. Through his channel, Kirkman endeavors to elucidate complex repair concepts to a wide audience, and the 'Kirkman' Theoretical Education Carburettor Model serves as a prime example of his commitment to educational clarity. With a keen focus on accessibility and comprehensibility, Kirkman commonly employs his 'Kirkman' Educational Carburettor Model as a didactic tool, breaking down the intricacies of two-stroke carburetor systems in a manner that enthusiasts and novices alike can readily grasp. Have a Great Day Craig (Owner and Creator of The Repair Specialist Channel)
You Will Finally Understand this - The Chainsaw's ‘H’ Screw Settings!
00:54
TheRepairSpecialist

You Will Finally Understand this - The Chainsaw's ‘H’ Screw Settings!

At high engine speeds, the H screw on a two-stroke chainsaw carburetor plays a vital role in controlling the air-fuel mixture ratio. The engine's fuel delivery quantity is managed by the H screw, which is a component of the carburetor's adjustment mechanism. The H screw modifies the fuel flow to ensure maximum engine performance and combustion efficiency when the chainsaw is operating at high RPMs. The H screw leans out the mixture and lowers the fuel content when turned anticlockwise. Turning the screw clockwise enriches the mixture and increases the fuel-to-air ratio. Achieving maximum engine power output and avoiding problems like engine stalling or overheating during high-speed operation depend on the H screw being adjusted correctly. The H screw is also essential for adjusting the chainsaw's performance to suit different fuel types and operating conditions. To maintain maximum engine performance, chainsaw operators may need to adjust the H screw when switching between different types of fuel, such as standard petrol or ethanol mixes. Additionally, variations in temperature or altitude can have an impact on air density and, in turn, the engine's requirements for the air-fuel combination. Chainsaw operators can maximise performance and longevity by fine-tuning the H screw to guarantee that their equipment operates smoothly and efficiently under a variety of operating circumstances. What is the 'Kirkman' Educational Carburetor Model? The 'Kirkman' Educational Carburettor Model, conceived in the United Kingdom, by a British Engineer called Craig Kirkman, was ingeniously designed to demystify the intricate workings of two-stroke carburetors, offering a simplified approach to understanding their functionality. The 'Kirkman' Educational Carburettor Model is not a physical, tangibly built and functioning carburetor. This model must not be confused with the Kirkman Carburetor, which is a carburetor model developed by the American engineer William Kirkman in the early 20th century. Instead, the 'Kirkman' Educational Carburettor Model is a theoretical concept, and teaching model, which consists of a drawing and explanation of a 2-stroke carburetor, which was designed by Craig Kirkman himself. Kirkman, A City and Guilds qualified repair engineer with a BSc Hons degree in Science and a Post Graduate Certificate, unveiled his innovative carburetor model to the public through his YouTube channel, aptly named 'The Repair Specialist', in 2016. Through his channel, Kirkman endeavors to elucidate complex repair concepts to a wide audience, and the 'Kirkman' Theoretical Education Carburettor Model serves as a prime example of his commitment to educational clarity. With a keen focus on accessibility and comprehensibility, Kirkman commonly employs his 'Kirkman' Educational Carburettor Model as a didactic tool, breaking down the intricacies of two-stroke carburetor systems in a manner that enthusiasts and novices alike can readily grasp. Have a Great Day Craig (Owner and Creator of The Repair Specialist Channel)
THIS IS OUT OF YOUR CONTROL - This 1 Cause of Ignition Coil Damage to Note.
00:44
TheRepairSpecialist

THIS IS OUT OF YOUR CONTROL - This 1 Cause of Ignition Coil Damage to Note.

Insulation surrounding the coil windings is essential for eliminating electrical shorts and guaranteeing dependable performance in small engine ignition coil production. However, when the manufacturer pours the dielectric glue to wrap the coils, tiny air bubbles may unintentionally occur within the insulation. As the resin hardens, these air bubbles get caught in it, creating air pockets inside the insulation. These air bubbles may look harmless, but when the ignition coil runs under typical engine conditions, they can be a serious problem. Thermal expansion causes the trapped air in the insulation to expand when the coil heats up during operation. By opening up channels for electrical current to pass through the air bubbles, this expansion effectively shorts out the coil and impairs its operation. Air bubbles in the insulation of ignition coils for small engines can damage the coil over time and cause performance problems. The heat produced by the electrical current passing through the coil when it is operating aggravates the trapped air bubbles in the insulation. This expansion reduces the insulation's resistance to voltage spikes and fluctuations in addition to raising the risk of electrical shorts. As a result, the coil can suffer from random spark timing, sporadic misfires, or total ignition failure. In order to reduce these dangers and preserve the dependability of small engine ignition coils, producers must take careful quality control precautions during the resin encapsulating process. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
DON'T let the Ignition Coil Damage itself - Here's how!
01:00
TheRepairSpecialist

DON'T let the Ignition Coil Damage itself - Here's how!

The ignition coil plays a vital role in producing the high-voltage electrical spark required to ignite the air-fuel mixture inside the combustion chamber of a tiny petrol lawnmower engine. The coil tries to make up for the lack of spark by up-regulating its voltage generation when it detects that not enough spark is reaching the spark plug. With this modification, the engine will run more smoothly and a stronger spark will be produced by increasing the current flow to the plug. But as a result of the increased strain this increased voltage production places on the ignition coil, it produces more heat as it strives to meet the increased demand for electrical energy. Over time, thermal damage may result from the ignition coil's increased heat production as it tries to feed more current to the spark plug. The coil's internal components may experience thermal stress and degradation as a result of operating at temperatures above their intended capacity. The breakdown of the insulating materials surrounding the coil windings could result in electrical arcing or short circuits. Furthermore, too much heat may degrade the coil's magnetic characteristics, reducing its capacity to provide the voltage required for spark creation. In the end, the little petrol lawnmower engine's cycle of overcompensation and overheating may lead to frequent engine misfires, decreased power output, and a higher chance of coil failure. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
This Ignition Coil worked brilliantly for Years - BUT THEN.......
00:19
TheRepairSpecialist

This Ignition Coil worked brilliantly for Years - BUT THEN.......

A small lawnmower ignition coil's susceptibility to many conditions that can lead to coil failure increases with age. The insulation components of the coil may deteriorate with time as a result of exposure to heat, moisture, and outside pollutants. As a result of this deterioration, the coil is more vulnerable to electrical shorts and arcing between windings. Furthermore, the internal coil components may expand and contract as a result of extended exposure to the high temperatures produced during engine operation, which could eventually result in fatigue and mechanical stress. These stresses build up over time in the coil, thereby impairing its structural integrity and functionality. Moreover, heat cycling and electrical stressors may cause the primary and secondary windings of the ignition coil's electrical components to deteriorate with time. Increased electrical resistance within the coil as a result of this degradation may hinder current flow and lower the voltage output required for spark creation. This could lead to problems with the lawnmower engine, like sporadic misfires, hard starting, or total ignition failure. Electrical issues may also be made worse by oxidation or corrosion of the coil's connections and terminals due to ageing. In the end, a tiny lawnmower ignition coil's ageing generally reduces its dependability and efficiency, thus it must be replaced to maintain engine performance at its best. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
NEVER use Incorrect HT LEAD, or this could happen!
00:56
TheRepairSpecialist

NEVER use Incorrect HT LEAD, or this could happen!

The high-tension (HT) lead of a small gasoline lawnmower engine is essential for transferring electrical charge from the ignition coil to the spark plug, which starts the engine's combustion. Improper installation or damage to the HT lead might interfere with the electrical current, causing irregular sparks or even total ignition failure. The ignition coil must work harder as a result of this disruption to make up for the energy lost, which causes it to operate for extended periods of time under increased stress. The ignition coil may eventually overwork itself to the point of overheating due to the excess heat it produces. The coil's insulating materials may deteriorate when the temperature goes above its ideal range, which would eventually cause damage to the coil and a reduction in performance. The danger of mechanical failure can also be exacerbated by the increased workload, which can hasten the deterioration of other engine parts. Furthermore, the effects of a mismatched HT lead go beyond short-term problems with engine performance and can cause long-term harm. When an incorrect current flow causes the coil to overheat, its interior components are exposed to thermal stress and eventual damage. The coil windings' surrounding insulation may start to deteriorate, which could result in electrical arcing or short circuits. Furthermore, an extended period of exposure to high temperatures may damage the coil's magnetic characteristics and reduce its capacity to provide the voltage required for spark creation. In the end, this may lead to recurrent engine misfires, less power, and higher fuel usage. Thus, maintaining the longevity and optimum performance of a tiny petrol lawnmower engine requires careful installation and maintenance of the HT lead. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
CAREFUL - Lawnmower Excessive Vibration does this to the Ignition Coil!
00:41
TheRepairSpecialist

CAREFUL - Lawnmower Excessive Vibration does this to the Ignition Coil!

Because it continuously stresses the construction of the ignition coil, excessive vibration in a tiny pedestrian lawnmower is very dangerous. The vibrations produced by a lawnmower's engine travel throughout the entire apparatus, including parts such as the ignition coil. The structural integrity of the coil may be progressively compromised by these vibrations, which could result in microfractures or internal component slipping. Furthermore, the vibration problem is made worse if the lawnmower's crankshaft is deformed or the cutter blade is unbalanced. unequal rotation is caused by an unbalanced blade or a bent crankshaft, which results in unequal forces that put additional strain on the ignition coil. This could lead to faster wear and tear on the coil, impairing its insulating qualities and raising the possibility of electrical shorts. Excessive vibration might cause serious harm to the insulating qualities of the ignition coil. The coil's insulating materials may deteriorate and eventually break down as a result of vibration. This malfunction increases the possibility of electrical shorts by exposing the coil winding's to one another and outside factors like moisture or dirt. These shorts have the potential to stop the ignition system's power from flowing, which could result in inconsistent sparks or total ignition failure. To make matters worse, the heat produced by electrical arcing during short circuits can erode the insulation of the coil even further. In the end, a bent crankshaft, uneven cutter blades, and excessive vibration can seriously harm the ignition coil, endangering the dependability and performance of the lawnmower. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
Don't Use Incorrect Spark plugs - Look What Happens!
00:58
This is Why SO MANY Lawnmower Coils Cut Out when HOT
01:00
TheRepairSpecialist

This is Why SO MANY Lawnmower Coils Cut Out when HOT

The information given in this video is NOT the only reason why a Lawnmower might Cut-Out when HOT. However, too much heat can cause a lawnmower ignition coil to fail for a number of reasons, chief among them being the insulation between the main and secondary coils. To stop electrical leaks and preserve the integrity of the coil's operation, the insulation acts as a barrier. However, the materials that make up the insulation may deteriorate when exposed to high temperatures, like those produced during extended engine operation. Heat expansion can worsen even tiny cracks or defects in the insulation, opening up channels for electric current to flow from the primary coil to the secondary coil or outside. This leakage reduces the effectiveness of voltage transfer and may eventually cause the ignition system to fail. Moreover, the issue is made worse by the cyclical nature of heating and cooling. Any existing insulating fractures or vulnerabilities may enlarge as the ignition coil heats up during engine running, allowing additional electric current to escape. Nevertheless, these cracks close up again when the engine is turned off and the coil cools. This contraction can bring the coil back to life temporarily, enabling it to run sporadically until it warms up again. This cycle of expansion and contraction over time may exacerbate pre-existing damage and ultimately result in the ignition coil failing entirely. Consequently, it is essential to preserve appropriate cooling systems and guarantee the integrity of the insulation to avoid overheating-related ignition coil failures in lawnmowers. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
How a Lawnmower Ignition Coil Pack Works
01:00
TheRepairSpecialist

How a Lawnmower Ignition Coil Pack Works

The way a lawnmower's flywheel ignition coil pack works is essential to producing the electrical spark that the engine needs to ignite. This system's flywheel, which is held in place by strong magnets, is its central component. The trigger coil is usually situated close to the flywheel, which creates a magnetic field surrounding it as it rotates in tandem with the engine's motion. As the magnets pass past, the trigger coil acts as a sensor, picking up on changes in the magnetic field. The main coil is subsequently informed of this. The battery or magneto's energy is gathered by the primary coil, which then converts it into high-voltage pulses. This energy is quickly built up by the primary coil when it receives a signal from the trigger coil. Mutual induction is then used to transfer the higher voltage from the primary coil to the secondary coil. The voltage is further amplified by the secondary coil, which has a lot more windings than the primary coil. Through the process of electromagnetic induction, which produces a considerably higher voltage in the secondary coil due to the main coil's fluctuating magnetic field, this amplification is accomplished. The voltage discharges via the spark plug and produces a high-energy spark across the electrodes when it exceeds a crucial threshold. The power stroke of the engine is started when this spark ignites the air-fuel mixture inside the combustion chamber. The complex interaction of the flywheel, trigger coil, primary coil, and secondary coil guarantees dependable ignition and effective running of the lawnmower engine in this manner. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
Lawnmower Stops when HOT. 1 Common Reason!
01:00
TheRepairSpecialist

Lawnmower Stops when HOT. 1 Common Reason!

A malfunctioning ignition coil may be the reason behind a lawnmower that shuts off when it becomes too hot. The high-voltage electrical spark required to ignite the fuel-air combination in the engine's combustion chamber is produced by the ignition coil. When the ignition coil starts to malfunction, it might operate correctly when it's cold but not when it gets hot. After the engine reaches a particular temperature, this may lead to a weaker or sporadic spark, which could cause the engine to misfire or stall. Furthermore, when exposed to heat, a malfunctioning ignition coil may develop internal shorts or insulation failure, which would result in total loss of spark and engine shutdown. It can be difficult to diagnose an ignition coil problem because the symptoms may not appear right away when the engine is heating up. Engine stalling or misfiring while the engine is under load or at higher temperatures are common indicators that the ignition coil is deteriorating. Other symptoms include weak or sporadic spark. Ignition coil problems can be detected with the use of diagnostic testing, such as measuring the resistance of the coil or performing a spark test. To fix the issue and guarantee dependable engine performance, especially in hot weather, the defective ignition coil must usually be replaced with a new one that meets the right requirements. To maintain the lawnmower operating smoothly for the duration of its life, ignition coil failures can be avoided with routine inspection and repair of the system's component parts. Have a great day Craig (Owner and Creator of The Repair Specialist Channel)
Home: Latest Videos
The Repair Specialist Logo Craig Kirkman

FREE

If your chainsaw is experiencing starting, or running, problems then why not try this FREE easy to follow step-by-step printable download checklist guide to see if it gets your chainsaw back up and running again.

Home: Image

USEFUL PRODUCTS

Home: Text

CHAINSAW SPARK PLUG

High Quality

NGK 4626 BPMR7A Spark Plug.

  • Genuine NGK Spark Plug

  • BPMR7A

  • Long Life

  • Original Equipment

  • Always Check Owners Manual Before Fitment

This product is sold by an Amazon third party seller, not us. Please also read the product description on Amazon to verify this before purchasing. Thank you!

Home: HTML Embed

CARBURETTOR CLEANING SPRAY

MANNOL Carburetor Cleaner Spray for all petrol engines 9970 400ml

  • Professional Carburettor Cleaning For Twin and Viertaktbe Nzin engines with or without catalytic converter

  • Removes high temperature deposits from the inner and outer surface of the carburettor

  • Removes dirt and debris on the housing, throttle and nozzle

  • With 120 mm long plastic tube for the perfect grip

  • Volume: 400 ML

This product is sold by an Amazon third party seller, not us. Please also read the product description on Amazon to verify this before purchasing. Thank you!

Home: HTML Embed

CARBURETTOR JET CLEANING TOOL

Carburetor Jet Dirt Cleaner

Includes 13 Cleaning Wires Set + 10 Cleaning Needles + 5 Nylon Brushes Tool Kit for Motorcycle ATV Moped Welder Carb

  • NON-UNIVERSAL: Only fit Carburetor Engine Moto, Carbon Dirt Deposit Remove.

  • WIRE SET WITH CARRYING CASE: Made of high quality steel, come with a lightweight and compact aluminum carrying case, a great tool keep on hand.( Product Dimension: 10.2 x 2.3 x 1.2cm/4 x 0.9 x 0.47in)

  • DIFFERENT DIAMETERS: This wires set come with 13 different diameters, especially designed to clean out the tiny jets and carb passages from all dirt.

  • CLEANING NEEDLES AND BRUSHES: Perfect for clearing out blockages or obstructions in the narrow passage of auto motorcycle carburetor.

  • MATERIAL OF NEEDLES & BRUSHES: Stainless steel & Nylon, spiral bristle make it easy to get access to the inner side, making the washing clearly and thoroughly.

This product is sold by an Amazon third party seller, not us. Please also read the product description on Amazon to verify this before purchasing. Thank you!

Home: HTML Embed

BRIGGS & STRATTON

Carburettor Diaphragm/Gasket Kit. 795083

For Briggs and Stratton Classic, Sprint, Quattro, Series 400​, Series 450 and Series 500.

  • Genuine Briggs & Stratton Carburettor Diaphragm Kit

  • Part Number : 795083 replaces 495770

This product is sold by an Amazon third party seller, not us. Please also read the product description on Amazon to verify this before purchasing. Thank you!

Home: HTML Embed
bottom of page