No power flathead

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Bikes: '48 WL '94 Buell ST2 Thunderbolt, '55 T140V Triton, '76 Honda ST70/125.
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No power flathead


Post by ignatzcatz » Thu May 24, 2007 11:31 am

Description: No power from my 1948 WL

I posted a message in the 'members section' regarding problems I have with no power from my '48 WL. I guess I shoulda put it here but if any budding mechs can check it out and let me know of your recomendations I'd be most grateful.

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Re: No power flathead


Post by Cotten » Thu May 24, 2007 12:53 pm

Diagnostic #1:

Diagnostic #1a:
Then turn the motor through to pressurize each cylinder so you can test the sparkplugs and headgaskets as well.

Diagnostic #1b:
While the cylinders are pressurized, listen carefully for excessive leakage at the open timing inspection hole, and at the end of the exhaust. You can crank the pressure up 20-30 psi (2 atm) for this one, or put the pressure directly to the sparkplug hole.

If your manifold, cylinderheads, rings, and exhaust valves seem to be in good order, we can go on to the simple stuff.


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