Craftsman

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

As long as it is not less than 0.30mm, it will be OK. If the gap is too great, the engine may not start as easily. If the gap is too small (< 0.30mm), there is the risk that the coil and flywheel might touch as the flywheel heats up and expands when the engine is run.
Lawn-Boy recommends setting the clearance, also called the air gap, between the coil and flywheel at 0.010 inch.
Common armature gap ranges are . 006 – . 010″ and . 010 – .
For circular coils this spacing is equal to half the diameter of the coils; for square coils it is2 equal to 0.5445 times the length of a side.
The air gap is required to be two times the diameter of the outlet of the waste pipe, which in this case is the relief valve on the RPDA. If you connect the two RPDA waste pipes, then the pipe size shall double in size where the two pipes connect and remain the same size the rest of the length of the drain line.
If the gap is too small, the air can become ionized. When this happens, the air changes from a good insulator, to a good conductor. This is what allows an electrically charged thunderstorm cloud to suddenly release large amounts of current in a lightning strike.
Many think the larger the gap, the better. However, if the gap is too large, and the ignition system can`t provide the voltage needed to spark across the gap, or turbulence in the combustion chamber blows out the spark, misfires will occur.
016″ gap is the most common for those running stock flywheels on Predator 212, 196 Clones, GX200 Hondas, Tillotson 196, 212 & 225 engines small blocks as well as big blocks and v-twins. The stock flywheel magnets are not as strong as those in aftermarket billet flywheels.
An air gap usually presents along the coil axis between the plunger and armature when the valve is deenergized. When energized, the electromagnetic force pulls in the plunger eliminating the gap, causing the valve to transit from one flow state to another.
What should the spark plugs be gapped at? When running a magneto ignition it is not necessary to run a wide spark plug gap due to the longer duration of spark. We recommend that you set your plugs anywhere from 0.018” to 0.025” with the closer gaps being used for higher RPM applications.
In turn, contact coils heat faster and has strong power then spaced coils under the same power. The heating speed of contact coils is concentrated in the middle position, so it is easier to burn vape cotton when power is slightly too high. On the contrary, each wrap of spaced coils is same in heating speed.
(1 + a). If a constant magnetic field B. exists perpendicular to the coil, then find emf induced in coil as a function of time.
The minimum required air-gap separation shall be measured vertically from the lowest end of the potable water outlet to the flood rim of the receptacle into which the potable water discharges. This air-gap distance shall be a minimum of twice the effective opening (0) of the potable water outlet.
The use of an air gap is required by plumbing codes for certain plumbing fixtures, such as dishwashers, to prevent the backflow of potentially contaminated water into the clean water supply. If contaminated water backflows, it can cause serious health risks.
The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear.
A malfunctioning ignition coil will cause your vehicle to misfire when you accelerate. In extreme cases, a misfire could cause your vehicle to shut down while you are driving.
Replacement Plug

The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at . 030 inch.

The gap, or distance between the electrodes, should be between 0.028 and 0.031 inches.
The Spark-Plug Gap

One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.

An incorrect gap can lead to spark plug performance issues like engine misfires or increased plug wear. It won`t be as directly noticeable if the spark only fails intermittently in igniting the air fuel mixture. However, the firing failure will manifest as engine power loss and fuel inefficiency.
The safety gap used on multi cylinder magnetos which incorporate a distributor Is often located between the pickup and the body, underneath the arch of the horseshoe magnet. Another location for the safety gap on multi cylinder magnetos is on the rotor arm underneath the distributor cap.
The flywheel works with the standard OEM clone coil with a recommended coil gap of . 038-. 040″.
These plugs are pre-gapped at . 044″.
Turn the ignition ON. Start the engine, or simply turn it over if it won`t start, and watch the transparent sides of the tester. If no visible spark or glow is present, then you can be sure that no spark is occurring at the all-important tip of the spark plug.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Replacing coil pack need to know space from mag
ANSWER : Ignition module gap Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.

If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
Thank You for using FixYa.

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HOW TO TEST IGNITION COIL ON A POULAN CHAIN SAW MODEL 2000? ALSO WHAT IS THE AIR GAP ADJUSTMENT FOR THE SAME?
ANSWER : Ignition Coil Test by SmallEng.com

You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You do not have to bend up the electrode.

Ignition module gap Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when the flywheel is rotated.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

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How to replace ignition coil on asthil 029
ANSWER : Coil should be held on the saw with 2 torx t27 size screws. These will resemble a star. Remove the 2 screws, lift out the coil. The small wire should be attached with a spade connector, slide the spade off with needle nose pliers. Disconnect the spark plug wire from the spark plug, & thread it out of the saw as you remove the coil. Assembly is reverse order of removal. For clearance, loosen coil screws, alike coil away from flywheel

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My chainsaw has no spark, I have checked the spark plug and it works on another unit, i guess it may be the ignition, ho0wever as it is a small coil I have no way of checking. can the coil be simply tested, otherwise can one be purcahsed.
ANSWER : Yes the coil can be tested. you would need to know the proper specs but with a multimeter you should be able to get a resistance value from your plug wire to ground. With my experience 10000 – 30000 ohms should allow it to run. If this is no help one common thing is your kill switch. A wire should run from the coil to the switch, if this wire is shorted to ground it will not run.

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Air gap at the flywheel and coil on a 4 horse
ANSWER : Gap is .008 to .012. But use a brass feeler gauge.

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Stihl HS 80 stops after a while
ANSWER : Check the fuel tank vent, it could be creating a vaccum in the fuel tank which is stopping the carb from drawing up the fuel. Then you’re having to wait till the pressure in the fuel tank equalises again.

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What is the gap on the home lite might blower ignition coil
ANSWER : A clean and dry business card is just about the perfect thickness for the recommended .006″ gap. Rotate the magnet of the flywheel around to the module side. Put the card between the module (coil) and the magnet. Allow the module to tighten against the magnet, then tighten the screws that secure it to the crankcase. Rotate the flywheel to remove the card. Test for contact by rotating the flywheel. Check for any lateral play in the crankshaft bearing by trying to wiggle the flywheel side to side. There should be no play in the bearing.
Good luck!

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Ignition module gap setting
ANSWER : Look up the manual on the stihl site
it tells you this detail

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My name is June Strandberg, and I am a florist and gardener in San Francisco. I have been working in the industry for five years, and I love helping people find the perfect floral arrangement for their special occasions. I am also skilled in troubleshooting and fixing gardening tools, so if you are ever having trouble with your tools, please don't hesitate to reach out to me.