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Title: 400EX smokes what to do Post by: SPLDan on May 13, 2006, 01:55:42 PM I'm thinking about pickin up this 400EX that smokes a little bit and just figureed I should clear up a few thigns before and get some input ..
It somes a lil on start-up and has a steady stream once its warmed up and your on it .. Its not to bad but enough to notice it . I was going to do a .40 over 11:1 Weisco piston , bore and hone it and a new topend gasket set with a cometic HG ... What about a cam will this be a good time to do it or should I wait it out ? Quad is only gonna run on 100 Octane Sunoco GT Fuel so I dont think detonation wil be a problem I figure this will run me around 250 $'s and some downtime on the quad probally a weekend at most . Do the 416cc quads pull much harder than a regular 400EX . I'm not gonna put no rev box on it and it has a Full HMF Exhuast and Jet Kit already . Title: Re: 400EX smokes what to do Post by: Chevy1500z71 on May 13, 2006, 03:10:21 PM it will be definitly beter with a 416...
Title: Re: 400EX smokes what to do Post by: kfx400rob on May 13, 2006, 03:12:42 PM get a z
Title: Re: 400EX smokes what to do Post by: Chevy1500z71 on May 13, 2006, 04:02:15 PM get a ltr ;)
Title: Re: 400EX smokes what to do Post by: Yamaha72 on May 13, 2006, 07:46:16 PM It smokes because the rings are shot, so yes putting a new piston in is not a bad idea at all... The JE piston will run you 150-175, the bore will run you from 60-80 depending where you go, so your guesses where pretty accurate, but the JE pistons do require the cutting of your rings to custom fit them. Detonation will not be a problem, you could run a little hotter plug, and for the cam, you don't need it unless you want that extra power, but a cam will run you 160-190 depending on which brand and that is with your core exchange...
Title: Re: 400EX smokes what to do Post by: Chuck_Norris on May 14, 2006, 08:13:43 AM with 11:1 you would still be OK for 93 octane.
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