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Author Topic: High compression piston  (Read 1597 times)

petross

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High compression piston
« on: November 11, 2007, 06:07:21 PM »
  I've been eyeballing that high compression piston.  is there anything else I should do with the engine, or does the stock head and valves accept that piston??  I know thqt in a lot of cases like this, one cannot just slap parts on and go without tweaking a few other things.

dewjantim

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Re: High compression piston
« Reply #1 on: November 11, 2007, 10:15:30 PM »
I'm pretty sure that the high comp piston is plug and play, but it is always a good idea to check to see if the valves clear the piston crown when going up in compression. For even more comp use the thin head gasket.......Dew.
If it hurts, you're not dead yet!!!!!

petross

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Re: High compression piston
« Reply #2 on: November 12, 2007, 04:43:19 AM »
Right on, thanx.  I was also thinking about laping the mating surfaces on the head and jug and doing away with a head gasket.................but thats taking it too far I think.   :D

dewjantim

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Re: High compression piston
« Reply #3 on: November 13, 2007, 12:20:52 AM »
You will probably want to use a head gasket. You don't want the compression so high that you can't run pump gas. I've got 10.5:1 pistons in both an old ironhead sporty and a 1978 SR500 single Yamaha. Both are pretty noisy without octane booster, even with high test gas.....Dew.
If it hurts, you're not dead yet!!!!!