Severe smoke out of one side!

[CalsXS2]

I must bought this 75 motor for $150 with a bunch of other new part's. I knew I was taking a gamble. I'm not too worried,,,yet. The thing has been sitting for 2 year's with the guy I bought it from. He says he just fired it up once and one of the carb's was dumping gas. Then he let it sit for 2 year's. Unknown history before that.


I put it in, put my fresh carb's on, and kicked it 5 times with the switch off by accident, ,, then once I turned the switch on, it started on the first kick. I've only let it run for about 5 minutes due to needing a new sump gasket from changing the oil and filter's. Now I have a severe leak. Just waiting to get a new gasket.

So anyway. I know it could be just a stuck ring, or a hardened seal if I'm so lucky. Should I maybe squirt something like seafoam in the cylinder's. Maybe seafoam in the oil too. Or should I just ride it and see what happens. How should I proceed. Thanks.

 

[CDNTX650]

white smoke?

if so then valve stem seal.

 

[CalsXS2]

white smoke?

if so then valve stem seal.

Yep. White smoke.And it smelled like oil burning of course. Looked like a masqeuto sprayer just went by. Hmmm. I haven't seen one of those in year's.


So should I just ride it and see what happens. Or do I need to tear into it before it does more damage.

 

[sgallaty]

I recommend fixing the problem.

 

[CDNTX650]

mine was like that and it was both sides. had to tear it down as it will never go away, and do the stem seals. Then i did new rings, hone, cam chain, guides while i was in there.

 

[CalsXS2]

Well I seem to have chased the smoke from one side to the other.

Here's what I did. I hope I didn't mess up. I'm sure you guy's will tell me if I did.

I pulled the plug's and pored some seafoam in the cylinder's. I let it sit for about 15 minute's. I kicked it over a few times and blew out the excess. I let it set over night. I fired it up and the side that was smoking didn't smoke a bit. But now the other side is smoking. Not as bad as the other was. I thought maybe I switched plug's side for side. Put a different plug in the smoking side,,still smoking.

I put seafoam in the oil and let it run for about 10 minutes. Still smoking. I now have oil seeping out of the head gasket, but I guess that's to be expected. I'm going to change tho oil to some 50w like I read in the other thread.

Why do you guy's think the smoke went from one side to the other.

 

[sgallaty]

Engines will always smoke a little after seafoam if you've not done it in a while. Get new plugs just to make sure and if it's not smoking, all hail seafoam.

I recommend against changing to a single-weight oil. You've got an oil leak. There's a right way, and lots of very wrong ways to deal with this.

1) check head torque
2) replace seals
3) everything else that is the wrong thing to do

I have also found it can help to dump some seafoam in the gas tank and the oil too, to dissolve deposits. Change the oil after a 1000 miles or so after you've done that.

 

[coughing skunk]

Seafoam helps break up the carbon deposits, which will subsequently get burnt off/out and causes some smoke. Sounds like that's part of the issue at hand.