Pistons

I'm having trouble getting hold of a standard 12.5 to 1 piston, but can get hold of a 13.5 to 1 compression piston. Has anyone tried the 13.5 to 1 ? Any other changes required? Does it make any difference?

Mike

Originally posted by MXH:

I'm having trouble getting hold of a standard 12.5 to 1 piston

Mike,

Are you talking about a stock piston or any 12.5 to piston???

Ernie

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--Life is too short, work hard...play hard--

Sponsored by Yamaha of Cucamonga, Larry Roeseler's Stroker Fourstroke Speed Equipment and Answer Racing

Well, I was referring to the difference in compression ratio, but are you going to suggest a difference in different makes of piston as well?

Mike

I am running a 13.5 to 1 97mm wiseco.

After setting the deck height/squish with 22cc of chamber volume the static compression is around 14 to 1.

The other changes include putting grip tape on the seat cover so I can hang on!

(THANKS TUNER!)

SFO, what fuel are you burning? What gearing are you running? I had to go up a tooth on the front to be able to use first gear at all.

Ain't that motor wonderful?

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MX Tuner

Tuner,

I am reading right out of Riches bible. Thank you for hooking me up with him.

The bike is on the dyno right now.

I am comparing strait B37 to B37 with MTBE and am also running some unleaded nutec to see how it compares.

I am also running a Arrow pipe and the falicon cam sprockets set at intake 105 lca and exhaust 106 lca.

I also took 50 grams out of the piston/wristpin. The dyno will tell if I made stuff too light...

I also brought all the needles from TT and JD.

Dale Lineaweaver, (my friend with the dyno) laughs and pulls out a box that has at least 500 needles in it. He says that he thinks he has it covered.

Dale is looking at the 97mm setup for a husaberg to contest his Pace championship.

Yup, this thing flat out hauls the mail.

I will post the #'s as soon as I know.

I hope it lives.

Oh yea, midrange hit is too mild a description for what this thing does.

I am still running my woods gearing, 14-52.

now the first two gears are unusable.

It reminds me of my old yz490, keep the bike in a taller gear than you think always, or end up on your head!

[This message has been edited by SFO (edited October 06, 2001).]

[This message has been edited by SFO (edited October 06, 2001).]

[This message has been edited by SFO (edited October 06, 2001).]

Remember what they say: "Too much horsepower is *just* enough".

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MX Tuner

52 dynojet rear wheel hp.

will post the chart if you are interested.

The arrow pipe is great!

I will post the db #'s tommorow.

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