Well, you either don't have enough spark or spark at the wrong time.
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Will a chainsaw run without the Exhaust/Muffler?
- Thread starter CFOD
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CFOD
ArboristSite Lurker
What changes when it sparks?
Is it an aftermarket coil? Is it exactly the same as the original? A lot of people set the air gap with a business card.
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CFOD
ArboristSite Lurker
OEM coil, didn't know I had the option to change the spacing, will definitely have to have a look at that
Yes, the mounting holes allow a little movement. Loosen them and put a business card between the coil and the flywheel magnet, push the coil up to it and tighten the screws, you can set it with feeler gauges but I can't remember the distance, a business card works well.
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CFOD
ArboristSite Lurker
This is becoming irritating now, the distance was about that of a business card with just a hint of friction. It has fuel, even when I force it into the cylinder, its definitely sparking and I assume definitely has compression. I'm at a loss. Doesnt even think of trying to fire, not a hint
I'm just an amateur, I don't know what to tell you. If it has fuel, air and spark just before top dead center, it should fire.
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CFOD
ArboristSite Lurker
No sorry, I wasn't expressing frustration towards you, just the chainsaw. I've had so many suggestions and it isnt even thinking of firing. I appreciate everyone's help on here, this saw is just relentless
I didn't take it as frustration towards me. I was just saying I've suggested all I know. I've learned all I know from personal experience and these forums. Somebody will give you the information you need, sometimes you just have to be patient and sometimes if you take a break from it, ideas will pop in your head and you will figure it out. Just curious, how are you checking for spark?
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CFOD
ArboristSite Lurker
Hold the plug against the cylinder and pull, can very very easily see a lot of sparking so it's definitely not short of ignition
That's the way I do it too unless I use my spark tester.
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give us a number, around 100 is not good
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But give us that number from a gauge KNOWN to work with small capacity small motors- not one designed to give correct readings off of a V8 diesel!
New piston, carb rebuild and coil, what was the reason you did this work? Was it a running saw or dead for a reason that is carried foward to now.
Carb rebuilt properly with impulse hose connected?
Vacume or pressure leaks?
You should do a proper compression test to see how the piston and rings are sealing.
When you can confirm your repairs you can move forward with other possibilities.
To further add...
Have you verified the choke butterfly works.
The H and L jets are at factory settings.
Why no muffler? Some motors like to see some back pressure, not sure if needed with your motor.
Piston installed correctly in the right direction.
Tried old coil for elimination.
Proper sparkplug, gapped correctly.
Do you have a decompression valve, if so not stuck open.
Check timing to see if flywheel key is not sheared.
List can go on and on......
Have you verified the choke butterfly works.
The H and L jets are at factory settings.
Why no muffler? Some motors like to see some back pressure, not sure if needed with your motor.
Piston installed correctly in the right direction.
Tried old coil for elimination.
Proper sparkplug, gapped correctly.
Do you have a decompression valve, if so not stuck open.
Check timing to see if flywheel key is not sheared.
List can go on and on......
It should be flooded if you squirted mix down the plug or carb, hold it wide open and pull a lot, most times 10 to 15 pulls to get it to run. Also the carb could be dumping if fuel keeping it flooded, try unhooking the fuel line and plugging it then hold wide open and try starting. If not flooded how much mix did you put down the carb, it takes more than 2 drops, about a teaspoon or so works good. Steve
Are you sure the compression is good, too low they wont start. Steve
Repeat re ignition components.
Are the ignition module and flywheel the same brand?
Air gap should be 0.3mm
Are the ignition module and flywheel the same brand?
Air gap should be 0.3mm
Cycledude
ArboristSite Operative
Have u tried putting the muffler back on ?
CFOD
ArboristSite Lurker
It didn't come with one, however I have now bought one, no luck
