Whenever I downshift and let the engine rev down or whenever I go down a hill and engine brake, I get a lot of smoke when I get back on the throttle. Is this normal? If not, what's the problem. It runs and idles great otherwise. This is a new recon I'm talking about and I'm running Honda GN4 10w40. Thanks.

 

No, that's not normal.

Assuming the smoke is bluish, oil can get into the combustion chamber either by rings, valve guides, or breather.

Is the oil level correct (checked w/o screwing the dipstick back in) and is the engine broken in?

 

It's got about 15 hours on it. The oil level is right in the middle of the marks without screwing it in. It's not blue smoke, it's more white and I notice I have spooge coming out the muffler... greasy black stuff. I checked the compression and it was correct at 185psi. Should I be concerned?

 

Well, you got me... Sometimes an engine that is REALLY rich will make white smoke, but if it's that rich it wouldn't run well, or run very long without fouling the spark plug. Engine braking, like going down a hill will normally make the mixture richer, but the black greasy spooge coming out of the muffler?

Could you have gotten water (say when washing it), mud, or anything else in the muffler?

 

I was looking over the service manual last night and I am starting to think that the valve seals are leaking and letting oil suck down into the combustion chamber. Does that make sense? When you're engine braking or down shifting, the cylinder is trying to suck from the carb, but it's closed off, so that would put an increased suction on the valve seals. Just a thought... The spark plug is black, but it's not wet or oil fouled. I have been playing with jetting leaning it up a bit, but that's not doing anything to the smoke. It runs just fine otherwise.

 

Sounds like you're sucking oil in somehow. Too much fuel would be black smoke. Oil is blue or white with a blue hue. Water is white with a gray hue. I'd bring it back and let them worry about it. Could be something like a pcv or the equivelent.

 

With only 15 hours on the machine I would be taking it back the dealer and making a scene [img]i/expressions/face-icon-small-shocked.gif[/img]

 

dont touch it and bring it back to the dealer, say you want every penny back and dont back down

*cough*glock*cough*

haha jk..... [img]i/expressions/face-icon-small-smile.gif[/img]

 

Taking it back under warranty sounds like a good idea to me, too.

Leaking valve guides usually smoke on startup. I wonder if you've got a problem with rings... I read a thread a while back about a Foreman that smoked, and it turned out it was mis-assembled from the factory and the piston's wrist pin was riding against the cylinder wall... Could be something like that...

Anyhow, take it to the dealer and see what they say.

 

I wouldnt touch, or tell them you checked compression, or tried anything yourself. Sometimes that can be a more expensive lesson than you think