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snowmobiler14
02-08-2010, 04:17 PM
Hey my 400ex will smoke when cold but once warm it wont smoke anymore, but i go through about a quart of oil in a few hours of riding. would any of you guys know what the problem could be?
Foxhound013
02-08-2010, 04:26 PM
Have you looked it over for oil leaks, if your losing oil that fast you have to be leaking it somewhere. Check everything over really well.
honda400ex2003
02-08-2010, 04:42 PM
it could be the valve seals but you wont be losing that kind of oil that quick with just that. it must be leaking somewhere to be looks quarts in hours. steve
snowmobiler14
02-08-2010, 04:44 PM
well i used a bit under a quart in about 5 hours but i checked it over for leaks and i couldn't find leaks anywhere i looked.
UNBROKEN
02-08-2010, 04:53 PM
Originally posted by snowmobiler14
well i used a bit under a quart in about 5 hours but i checked it over for leaks and i couldn't find leaks anywhere i looked.

yea im bettin ure pistion rings are shot
snowmobiler14
02-08-2010, 04:56 PM
is that all you think ill need then?
snowmobiler14
02-08-2010, 05:27 PM
so if my rings were bad would it hurt it to keep riding it?
UNBROKEN
02-08-2010, 05:39 PM
Originally posted by snowmobiler14
so if my rings were bad would it hurt it to keep riding it?


no ure cylender is prob egged out so in that case u will need a rebore then piston, rings , crf450r timming chain, gasket kit also valve seals thats what my old 400 needed i was burning a quart every 3 hours of riding , i still road mine for a long while because i was waiting for parts to come , also now is the time to do any performace upgrades such as a cam or porting
2001trx400ex
02-09-2010, 08:23 AM
Ya i had the same problem, sounds like your piston rings are probably shot or on their way out, starts as a light white smoke and then when its real bad like mine got its blue and burns oil like crazy, i wouldnt ride it unless your planning on buying a high compression piston and boring out the cylinder otherwise your gonna scortch the cylinder walls or at least take a chance at doin it.
snowmobiler14
02-09-2010, 12:12 PM
yea i was just riding in a big snow storm we got just around my yard and now it won't even start i got it to start but not run great. so how much money should i have expected in this rebuild wise?
UNBROKEN
02-09-2010, 02:43 PM
i spent a thousand on mine but i had to have my head sent out and valves replaced and the seats recut so it depends