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Actual chainsaw question

Chity_Avatar

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As of last week the Mac Super Pro 80 was back up and running.....until today. It was a spark issue that I thought I had cured. This saw had no spark when I got it but it was caused by the woodruff key being sheared off and the plug wire was pinched and cut through the side cover. Once I put a new key in it an replaced the plug wire it fired right up and ran. I finally got a bar and chain for it and it still ran. A couple of days later it would just "pop" whe you pulled it over. Pull the plug and it has very little spark. Couple days later it fires up on the second pull and I hadn't done anything to it. It does this starting and not starting thing several times. I replaced the condenser last week due to no spark, as the coil tested good, and it had bright blue/white spark once again. Runs and cuts great.....Today it has no spark again. Points are new and gapped to .018", plug is new, plug wire is new, condenser is one I took from another saw and obviously worked, condenser is properly held down and grounded to the case. I can disconnect the kill switch from the coil when it has no spark and still nothing. Coil is gapped .010" from the magnets on the flywheel. Magnets are strong. Can a coil work and then not work and then work again? I have had them weak or bad but never not work and then work again. The coil is my last thing to replace.
 

Mastermind

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Point type ignitions are quirky, but normally solid. One thing to check for is a bit of trash between the points, clean them with a piece of paper after sanding. As to your question on coil.......look for cracks in the plastic. If you find any rub them full of clear 100% silicone.
 

Chity_Avatar

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Point type ignitions are quirky, but normally solid. One thing to check for is a bit of trash between the points, clean them with a piece of paper after sanding. As to your question on coil.......look for cracks in the plastic. If you find any rub them full of clear 100% silicone.

Would that suggest the voltage is leaving the coil before it can go through the plug wire?
 

Chity_Avatar

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If it has cracks in it it could be arcing....

Found small cracks and fixed. Also found a wear mark in the wire from the coil to the points. Removed the flywheel to remove wire and found the woodruff key 95% sheared off again. Would the key being so far off cause enough of a change in spark timing to miss the spark all together? I need to find a way to clean the tapered part of the crank and the taper part of the flywheel to get them to fit better and tighten up better. Looks like a little bit of material transfer between the two. I will post pics when I get back in the house.
 

Mastermind

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Found small cracks and fixed. Also found a wear mark in the wire from the coil to the points. Removed the flywheel to remove wire and found the woodruff key 95% sheared off again. Would the key being so far off cause enough of a change in spark timing to miss the spark all together? I need to find a way to clean the tapered part of the crank and the taper part of the flywheel to get them to fit better and tighten up better. Looks like a little bit of material transfer between the two. I will post pics when I get back in the house.

Clean the taper as well as possible, then use valve lapping compound the make is a sweet fit......
 

TK

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I'm not sure with the points system but that could be the problem. If the flywheel is activating the points at the wrong time then the spark could be mostly wasted. Electronic ignition would just fire at the wrong time, full power.
 

thomas1

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You definitely need to clean up that crank and flywheel. Scrub that gunk out of there and then have at it with some lapping compound, like Moobs said. I'm surprised your key made it as long as it did.
 

Chity_Avatar

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You definitely need to clean up that crank and flywheel. Scrub that gunk out of there and then have at it with some lapping compound, like Moobs said. I'm surprised your key made it as long as it did.

This thread is just full of firsts. This is the first informative and help full post I have ever seen you make. Maybe I have just been looking in the wrong places all this time. Keep up the good work poopin bear.
 

TK

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This thread is just full of firsts. This is the first informative and help full post I have ever seen you make. Maybe I have just been looking in the wrong places all this time. Keep up the good work poopin bear.

All he did was copy the monkeys post but used different words.... You're too easily impressed.

Well, that explains why you hang out with that other "special needs" fella so much..... :banana:
 

Chity_Avatar

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All he did was copy the monkeys post but used different words.... You're too easily impressed.

Well, that explains why you hang out with that other "special needs" fella so much..... :banana:

Your missing the point. There was no sarcastic under tone, no changing of the topic, and no mention of my chity avatar. If I were easily impressed you would have won that prize a wile ago.:***:
 

thomas1

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All he did was copy the monkeys post but used different words.... You're too easily impressed.

Well, that explains why you hang out with that other "special needs" fella so much..... :banana:

No, I commented after seeing a photo of how much crap was on the taper mating surfaces. There's no way he is going to get a good fit with all that crap on there. He's lucky he hasn't buggered up either of the keyways, next time he might not be so lucky.

You're just mad because I posted an epic photo tutorial of how to turn subscriptions off. Don't be hatin', it took many minutes of practice to hone my photo editing skills.

:farkyou:
 

TK

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I'm not mad, quite envious actually. And thank you, as it saved me time from going in and doing it.

You should post a tutorial on how to change those settings for future thread subscriptions so he doesn't have to do it again..... Thanks and :hand:
 

TK

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Your missing the point. There was no sarcastic under tone, no changing of the topic, and no mention of my chity avatar. If I were easily impressed you would have won that prize a wile ago.:***:

I impress no one. Never have, don't intend to start now. :farkyou:
 

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