Chainsaw Repair
How To Basics - Carb Fixes + Mods - IPL and Service Manuals => How To Basics and Fixes => Topic started by: Giles on January 19, 2013, 03:09:54 pm
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I cannot take credit for this because I didn't discover it. I guess I just thought it was well known. Might be that that person is a member here and can elaborate more:
I bought a Makita DPC7311 Concrete Saw that wouldn't run. I found the ignition coil was bad and was shocked to discover it cost $145.00 new. In several weeks, I did not find a used one, so I bought a "junk" saw with hopes of receiving a good coil.
Not to be--that coil was bad also, so I kept looking.
Then I read an old post describing how to SOMETIMES Revive a defective coil.
Of course this will not work everytime because if the coil is "fried" ---it won't.
His suggestion was to remove the spark plug and also to lubricate the cylinder wall, and make sure the clearance between the flywheel and coil is correct---app. 012. Proceed to spin the flywheel with an electric drill, at about 2,000 rpm, being sure rotation is in the right direction. C/C in most cases. Flywheel may have to be spun for a length of time but I had results within a few seconds from a DEAD coil.
I am fortinate enough that I have a Lathe and it is a simple matter to set the components up and run the procedure.
As I stated, I had TWO dead coils and this worked on both and the saw has continued to work.
These modern day coils are complicated because many change the engine timing and also limit the maximum rpm.
Much better then a point type ignition because at 13,000 rpm there would be "floating" and other problems.
Good Luck--might work for you and it will cost nothing ;D ;D
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Flywheel nut better be properly torqued before trying that.
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That should go without saying, but thanks. This procedure should not be carried out aggressavely because it is not necessary. It is also a good idea to remove the drill motor while under power as to help prevent a jarring stop shock.
You work with what you have, but a variable speed drill will work much better ;)
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Ha I've got an old Sears geardrive that lived under a pine tree in Pa for what looked like decade that was given to me .Why it died on the vine some years ago was because the wire got loose on the condenser .
I about pulled my arm off trying to get that thing to go .Aha ,drill motor .I spun the flywheel off that thing about three times before I came to the conclusion that wasn't such a grand plan .Chased around the garage by a mad flywheel ,who knew . ;D