wich is better compression to run?

[honda400ex1999]

what piston is better for ridding in the woods and short little drags on the beach?

[drew416ex]

11:1 is the highest you would want to go. Any more than that you might have heat probelms in the woods.

what else do you have or plan on doing?

[ngates788]

for your case i would just go with the 11:1 so you can still run pump fuel.. any higher and you would have to run at least 100 octane

[iownatoyota]

11:1 is nice, but i know plenty of ppl run 12 to 1 for trail riding and it works fine for them.

[dave4881]

BTW, what is the stock compression on the TRX400?

[deathcorefan2]

Originally posted by dave4881
BTW, what is the stock compression on the TRX400?

im gonna guess...and say 9:1
but i know squat about motors :(

9.1:1 to be exact

[honda400ex2003]

look at what you have in your area. If you can get premium easily no matter where you are go 11:1 if not then go down to 10:1. I like mine. It runs great and I can run midgrade if I have to. Where I ride I can not always get 92 or 93 octane gas. It made it easy for me. For a little drags and stuff go with 11:1 if you can then you can have the extra grunt for the win. Good Luck with what ever you choose. steve

[BigLuke]

12.1 comp in my 416, 93 octane is ok, but I run 110.

[jcs003]

high compreaaion is always good. the only real issues are cost of high octane and reliability of motor.