Power Valves

[El Camexican]

Any thoughts on this?

Two cylinders, same make and model bike, same part # cast into them, identical in all ways but one. The one in the first picture has a 3mm hole above the exhaust port and the second one doesn’t. I always assumed that hole was there to keep positive pressure on the power valve to keep it from fluttering, but why wouldn’t the second cylinder have the same hole? I have no reason that hole was put there by anyone other than the factory.

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[El Camexican]

Did some reading....

Seems if you were having a hard time kicking these over you could get the dealer to drill a 3mm hole 10mm above the port and it would act like a decompression valve without adversely affecting the performance.

[El Camexican]

Power valves .................we don`t need your stinking power valves ...................why don`t jew axe dem about your .......BULGES !!! ...........crickets ?.........dats cause your dee only one here .....Nico Suave ........pinche' power trip ......balls

Don't you have some crankshaft seals that need changing..... for the past 10 years?

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