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Tool Talk Discussion Forum

Chainsaw air gap

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Harry Mo.

10-14-2007 05:00:10




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Hey all. I'm having trouble with my Homelite VI Super 2 16" saw, purchased in 1984. It's been a great saw. I was cutting a downed tree last week when the plug wire kept coming off. The boot was hard & dry rotted & the spring connector was sprung etc. I replaced the coil & can't get it to start since. I noticed the coil mounting base was slotted where it bolts on, then got to reading about air gap. Does anyone know the correct air gap setting & what you use to measure this setting with? Maybe it's time to buy a new saw.I use the saw fairly often on 10 acres & wouldn't leave for deer camp without it.The 16" size & weight is about all I need. Thanks for any & all advice, Harry

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Harry Mo.

10-16-2007 01:58:50




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 Re: Chainsaw air gap in reply to Harry Mo., 10-14-2007 05:00:10  
Thanks,I'll give it a try. Harry



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Kentb of SWMO

10-14-2007 16:10:50




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 Re: Chainsaw air gap in reply to Harry Mo., 10-14-2007 05:00:10  
I use a bussiness card or the box top from the box the coil comes in the set the air gap.

Kent



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jdemaris

10-14-2007 06:37:23




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 Re: Chainsaw air gap in reply to Harry Mo., 10-14-2007 05:00:10  
The air gap isn't critical - but it is supposed to be between .01" to .015.



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kidbob

10-15-2007 07:36:03




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 Re: Chainsaw air gap in reply to jdemaris, 10-14-2007 06:37:23  
The air gap is very important. If you double the air gap you cut the generated electricity 75%.



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jdemaris

10-15-2007 08:18:21




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 Re: Chainsaw air gap in reply to kidbob, 10-15-2007 07:36:03  
That's simply not true across the board. If you double the air gap from .0005" to .001", or .001" to .002" a flywheel magneto will make more than enough spark. Now, if you go from .002" to .004" it gets weak, and if you go from .004" to .008" - well yeah.

When I said "not critical" - I meant, and still do - that a few thousanths either way makes little difference - within reason. Many of the engine companies will tell you - via their tech manuals - to just stick a double sheet of paper between the flywheel and armature and it will be good enough.

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paulinkansas

10-14-2007 09:42:39




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 Re: Chainsaw air gap in reply to jdemaris, 10-14-2007 06:37:23  
Whenever I have to redo the gap between those points, I take a crisp dollar bill and fold it in half. I use that as sort of a gap tool between the wheel that spins and the other 2 pieces. Once I've tightened everything down I remove the bill. It should be snug enough to spin with the bill still in there.



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