friend rebuilt his bottom end, and pours smoke!

[1998RM250]

My friend ordered all the parts from suzuki, had everything done properly on his 1993 rm 250 and it's blowing out tons of white smoke now. He said the antifreeze looks a tiny bit cloudy, but we think its oil? It also rev's like crazy when idling, he says. What could the problem possibly be, if indeed everything was done properly? :bang:

 

[_JOE_]

Hmmm. Sounds like maybe more than 1 problem. White smoke is antifreeze burning. Should have a distinct odor to the exhaust too. I would make sure the head gasket, probly o-rings, aren't damaged. The high revs would be an air leak somewhere. Look very closely around the center crankcase seal to make sure it's all in place.

 

[1998RM250]

He said he just checked the oil, its not really low but appears to be really black.
Thanks for the advice!

 

[whenfoxforks-ruled]

Take the radiator cap off and start it, look for air bubbles in the antifreeze. A bad head gasket seal sounds about right. Or, a bad water pump seal and air leak somewhere. Look at the plug, lean? Start the bike and hold a steady idle, then spray non-chlorinated brake cleaner around the intake manifold, case gasket, base gasket and left seal. If it revs up, you found it.

 

[1998RM250]

I told him to try the above, and he's going to soon. He said it's deff blowing oil right out the exhaust, and you can smell that its oil burning.

 

[GarbatyA4]

White smoke is burning antifreeze. Lots of oil could mean bottom end seals no sealing properly.

 

[whenfoxforks-ruled]

Oil in the combustion chamber, a backwards or damaged right crank seal. But the white smoke would be antifreeze for sure. Kind of a sweet smelling heavy white smoke. The liquid that comes out is black and sticky, both oil and antifreeze will leave that, spooge is spooge, its not supposed to be there.

 

[f4stunter]

I just had to rebuild my new to me cr250 because the PO installed the crank seals backwards. it was spooging bad like you say.

 

[whenfoxforks-ruled]

If you look at a parts micro fiche closely, it will show the proper direction they go. Usually, springs to the inside. I believe its Suzuki that makes an odd seal on the right side. If that is what is wrong, it can be changed without tearing it down, or so I have heard? I would take it back apart, what else is wrong?

 

[1998RM250]

My friend is going to tear it down soon, I bet it is that seal on the right side you are talking about... Where can i find more info on this? Thanks everyone, you guys are awesome!

 

[gregorious77]

http://www.google.co.uk/books?id=n_me_Is5-18C&pg=PA428&dq=1993+rm+250#PPP1,M1
Try getting this manual. you may be able to see the pages you need on here.