whats the difference.... i know it has something to do with running racing gas but will the power be much different...im going 87mm (416) bore....

and with my mods listed below, just guessing, how much horsepower you think ill be pulling out of this....my future mods after christmas will be a curtis sparks adv key, and YZ 400 39mm carb....
thanks for the help...im putting my quad in the shop this friday so any help about the piston would be grateful!

 

If you don't plan on running race gas be carefull increasing the compression AND adding the spark advance flywheel key... you might run into problems on pump gas.

Leo

 

how high can you go without runnin race gas??? I thought it was 12:1...... I need to know this cuz I'm gonna try to build a 330.....

 

If you are going to put the money in the motor why are you concerened spending a few bucks at the pump?

Klotz 113 costs $45 for 5 gallons at Syrdykes in St. Louis. I know you can buy race gas a whole lot cheaper, but this is good stuff.

Why sacrifice? Your motor will run cooler and Klotz has lubricant qualities which equals to less wear and tear. You will have to jet for the stuff.

 

It depends on many factors, but on average 11:1 seems to be the upper limit for premium. I run a 50/50 mix of premium and race gas in my 11:1 engine, I don't believe it really needs it, but I like the safety margin, as I tend to abuse it.