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Shaun Martens
02-12-2008, 01:18 AM
what is the stock compression on the 400ex?
hornetgod13
02-12-2008, 01:43 AM
9.5:1
Shaun Martens
02-12-2008, 01:47 AM
ok thanks. Does wiseco make a 416 piston with a compression lower then 11:1. the highest octane i can get from the pumps here is 91 or 92.
hornetgod13
02-12-2008, 10:43 AM
Wiseco makes both a 10:1 and 11:1 416cc (87mm) piston kit. You can run pump gas with either of those.
Shaun Martens
02-12-2008, 05:01 PM
ok thanks
TRXRacer1
02-12-2008, 06:39 PM
I'm running the 10:1 and it will knock on 87 so I run 93. I'm a larger rider so I bet if I was at 11:1 93 wouldn't cut it. I'm sure it would be fine for your average rider.
j450rking
02-12-2008, 11:15 PM
i am 260lbs and i run 93 with my 11to1 and i have never had a problum