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Dragsz09
10-07-2006, 11:32 AM
When i rev my quad in the high rpms it smokes is that bad??
bubba's400ex
10-07-2006, 12:03 PM
what color is the smoke?
Dragsz09
10-07-2006, 02:20 PM
blueish white
400eXr1d3rZ
10-07-2006, 03:09 PM
Originally posted by Dragsz09
blueish white

Replace your rings, or just get a new piston.
underpowered
10-07-2006, 03:12 PM
Originally posted by 400eXr1d3rZ
Replace your rings, or just get a new piston.

don't jump the gun on that just yet. may just be valve seals. take a compression test and see what it reads. if it has good compression i would just get new valve seals and start there.
400eXr1d3rZ
10-07-2006, 03:16 PM
Oh yes, forgot about that. I replaced my piston and it never smoked anymore. I would replace rings anyway though.
Dragsz09
10-07-2006, 03:21 PM
where can i buy thos??
underpowered
10-07-2006, 03:33 PM
your local shop is where i woudl go. or check C&D racing , the site sponsor.
xxnightraven73x
10-07-2006, 03:42 PM
mine did the same thing and my buddy thought it was the rings and the ammount of power the thing was pouring on i said no way valve seals and i was right its alway better to start cheap then go to the other things after but thats just me
400eXr1d3rZ
10-07-2006, 03:49 PM
A ring set doesn't cost that much, I got my JE ring set for 20 bucks.
billawright
10-07-2006, 05:43 PM
This question brings up something about my quad. Now before I get into i'll make it known right now my quad is only a few months ago, I bought it back in july. Now with that being said when im goofing around, doing donuts or what not a buddy of mine said he notices a good amount of smoke come out of my quad, he said its blue smoke, now it doesn't come out all the time cause i've sat on it in neutral and looked back while reving it and notice nothing. He said it could be cause I haven't changed the oil since I bought it, could that be it? I'd be pissed at myself if I ruin it somehow since I just got it.
Dragsz09
10-07-2006, 06:26 PM
yea same with me it doesnt happen all the time
DieselBoy
10-08-2006, 05:44 PM
they seem to smoke more when their under load......
vett_09
10-11-2006, 09:23 AM
Mine did the same thing. It only smoked when I was running it hard. I had to replace the rings and valve seals in mine. But then again, it was stollen for six months, so there's no telling what they did to it. How many hours does it have?
400excaleb
10-11-2006, 07:53 PM
so what do you need to change, cause when i rev mine up at high rpms, when i let out of it it smokes bluish white
xxnightraven73x
10-13-2006, 01:28 PM
id say start with the valve seals should only take an hour or so to do the give it a run and see if it still smokes if it does then youll know itll be the rings but you might as well start with something that you can get right to and get done quick and give it a run thats what i did and mines fine now
DieselBoy
10-13-2006, 01:39 PM
just so you know it is possible to change valve seals WITHOUT removing the head... its not as easy - but its doable.
dariusld
10-13-2006, 02:08 PM
2005 and he needs rings, why would he need anything? My 2000 doesn't smoke and its the original piston that has been run hard. Maybe he is running a little rich, but thats usually a dark smoke.
400eXr1d3rZ
10-13-2006, 03:20 PM
Originally posted by dariusld
2005 and he needs rings, why would he need anything? My 2000 doesn't smoke and its the original piston that has been run hard. Maybe he is running a little rich, but thats usually a dark smoke.

Bluish white smoke is oil burning.
DieselBoy
10-13-2006, 06:15 PM
do not dismiss the fact that these engines can burn oil, they are air cooled after all.
GPracer2500
10-13-2006, 06:33 PM
They can--but they shouldn't. If it's burning oil then something is worn out or not sealing like it should. I might forgive a 2 ringer slipper piston in a high strung engine for consuming a tad bit of oil, but an EX should not burn any if everything is up to snuff.
400eXr1d3rZ
10-13-2006, 07:33 PM
Will smoke come out of the exhaust if your lean?
GPracer2500
10-13-2006, 08:05 PM
Originally posted by 400eXr1d3rZ
Will smoke come out of the exhaust if your lean?

No. Leaness doesn't directly cause any smoking.

But you can damage an engine because of running lean. That could cause smoking. But then it's smoking from the damage--not directly from an lean air/fuel mixture.
400eXr1d3rZ
10-13-2006, 09:46 PM
When your lean, does your carb let alot of air in, and not enough fuel or vice versa?
GPracer2500
10-14-2006, 08:06 AM
lean is too little fuel for the amount of air
GoingBig
10-15-2006, 01:34 PM
if your exhaust seals are bad whne you start it up in the morning will it smoke real bad for a minute until it burns off the oil. Thats what mine does then it goes away the rest of the day.
400excaleb
10-15-2006, 05:12 PM
ok, mine is a little dark colored smoke, but how is mine running rich when i have the stock jetting and needle and fuel mixture screw 2 turns out with full hmf pipe, uni filter, it should be running lean.