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Old 11-30-2006, 09:43 AM
buggyman buggyman is offline
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Default Jackshaft

I'm going to be using a weed trimmer motor. The original jackshaft is very small (on the order of 1/4 inch"). Aside from the obvious stress that is going to be cuased by tapering or stepping the jackshaft from 1/4 to 3/4 inch (to fit the clutch), what possible problems can I run into?

Also, what holds the jackshaft in the engine? I don't see any way, other than lock tite to keep the jackshaft from just comming out of the engine.
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Old 12-01-2006, 04:21 PM
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robertdjung robertdjung is offline
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got a pic?

Jackshaft on the trimmer? You mean the main output shaft, right?

About what keeps it in the engine -- if you're talking about the main shaft, that's the crankshaft -- which attaches to the connecting rod, then to the piston. There are internal bearings and machined surfaces that keep it all in place.

I'm not really sure we're talking on the same page? Let me know if I'm close.
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Old 12-04-2006, 09:57 AM
buggyman buggyman is offline
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Sorry you are correct it is the crank shaft. I ended up opening the engine and found a solution. The recepticle for the crank shaft was simply bolted ont the fly wheel. I will therefore simply make a 3/4 inch crank shaft that is threaded to match the flywheel bolt and key if for the clutch.
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