PDA

View Full Version : Stock 400 compression


motojedi
10-23-2006, 02:33 PM
Hi guys,i was just wondering what the stock compression #'s should be for the 400?
krt400ex
10-23-2006, 02:37 PM
well, in PSI i dunno, but i know that is should be 9.1:1 stock.
GPracer2500
10-23-2006, 03:17 PM
OEM service manual calls for 100-130 psi. The auto-decompression mechanism on the stock cam is responsible for that low range. An aftermarket cam with no auto-decomp will create a much higher reading.
motojedi
10-23-2006, 04:28 PM
Thanks for the info.This is my 3rd 400 of my 15 or so machines.I got this 02 off a friend at work for $500.He rolled it and wasted the steering stem and ovaled the front rims(wheelie wipe out).I got it running and great after sitting for almost 2 years outside and he gave new rear plastics and a new front master cylinder.So i'm psyched for the deal and to rip my 4 kids around with me.

Later
George :D :D