4-stroke smokes like 2-stroke????

[slosh13]

I have a 400ex and I have been noticing that when I start it to go riding, it shoots a very large amount of blueish- smoke out of the exhaust. This lasts for about a couple or minutes or so, then all of a sudden it just stops. It runs very good after its been warmed up. Could it be just a "ritual" for getting warmed up or do I have something wrong with my motor that I should look into?
Help me out guys and girls...send me some feedback:D




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"Wow you must be fast cuz I was hauling a$% when I passed you."
:devil:

[Scott-300ex]

blue smoke=rich

its probably because you have the choke on or something.

also, your air filter could need cleaning and this w/ the choke together might lead to this, or your jetting could be off

but as long as it clears up after it is warmed up i wouldn't go crazy over it, but to try the simple things to fix it

[toby400ex]

if ur valve seals are bad they will leak oil when cold, then when warmed up they will stop leaking.

[Diedrich]

yeah i say its no biggie..i would look at the carb and adjust it a lil to see if it helps..if it dont check into the valve seals

[skemp]

Blue smoke is from burning oil, not from being rich.

Your valve seals are shot. When your quad is sitting not running for a period of time, oil will leak down through the valve seals and onto the piston. When you start it, it will burn that oil and produce the smoke you are seeing. It won't smoke as much when it is running because the parts are moving, but it will still leak. Check your oil and keep your eye on it because it is going to consume oil; and get it fixed. Valve seals are cheap.

[Scott-300ex]

oops:eek:

my bad

i didn't do that onpurpose

and the valve seals stop leaking because of the heat, since they expand

[zoom400ex]

could also just be the process for warming up.... the rings expanding stopping the smoke. the honda dealer near me told me that almost all 400's burn alittle oild anyway. he said "they are almost made to do it"

[250x#93]

the honda dealer near me told me that almost all 400's burn alittle oild anyway. he said "they are almost made to do it"

I never heard of a motor that was made to burn a little oil:huh :eek2:

[zoom400ex]

ya i know
i thought the saem thing when he said that..................i think he smoked a little crack beofre he talked to me....:huh

[Houser Cannondale]

black smoke= too much fuel
blue smoke= burning oil
could be just the motor getting wore out. all motors smoke eventually after they get rode so much.

[slosh13]

My choke isn't on when i start it....... So thats not a problem:(

[Bean]

white smoke means burning water or antifreeze to, lol


check your valve seals and your rings, maybe your bore is worn out and it needs slightly bored and re-pistoned

[Pappy]

Originally posted by skemp
Blue smoke is from burning oil, not from being rich.

Your valve seals are shot. When your quad is sitting not running for a period of time, oil will leak down through the valve seals and onto the piston. When you start it, it will burn that oil and produce the smoke you are seeing. It won't smoke as much when it is running because the parts are moving, but it will still leak. Check your oil and keep your eye on it because it is going to consume oil; and get it fixed. Valve seals are cheap.

and also preform a compression and a leak down test......

[mysticfalcon]

I've got an XR100 that smokes like a2-stroke. I think its because theres no rings. I could be wrong though. Its an old POS that I've been unsucesfully trying to kill for months.

[racinred330ex]

what u need to do is take the engine apart and check ur valve seals and u ring while ur at it u mine as well bore it over and put new pistons and rins to get a lil more perfomance