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View Full Version : valve tolerance


coreyownz
03-17-2010, 04:39 PM
my 400 is ticking so my dad said we should check the valves and we dont have the book for it so i was hoping someone would know what the valve tolerances were and if they were done warm or cold
honda400ex2003
03-17-2010, 04:48 PM
intake .004" and exhaust .005" for stockers.

hotcam is .005" intake and .006" exhaust.

steve
coreyownz
03-17-2010, 05:30 PM
thankyou so much i need to get it running for this weekend. would this be making it knock?
honda400ex2003
03-17-2010, 05:43 PM
very well could be, they tend to make quite a bit of noise when they get out of adjustment a bit. if anything it is cheap assurance and if it is still doing this then that can be ruled out. steve
coreyownz
03-17-2010, 06:16 PM
ok thanks and are these for when the motors warm or cold?
honda400ex2003
03-17-2010, 07:57 PM
these are for cold, good luck with it. steve
coreyownz
03-17-2010, 08:24 PM
ok thanks again
honda400ex2003
03-17-2010, 08:27 PM
any time dude, steve

heres a little guide for your first time.
http://www.atvriders.com/articles/valveadjustment400ex.html
coreyownz
03-18-2010, 06:43 PM
well the valves were just barely off so im lost on whats knocking. could it be the cam or chain?
honda400ex2003
03-18-2010, 06:47 PM
With an 04 the cam chain can be starting to get wore out a bit. If it starts to wear it can start to make noise, it starts to slap the slides a bit more and make noise. i would also take your tensioner off and make sure it is functioning properly, it should go out by itself but should not go in at all without turning the flat head screw in from the back side. there is a tool to lock it but if two of you do it you can hold the tensioner in until it is bolted down then release it to get the proper tension again. steve