cr250 worse (fouling+smoking)

[Eddels509]

So i changed my crank seals. I may have screwed up the right crank seal when i replaced it. It wasn't set in there right so i pulled it out and put it back in. But now its worse the thing won't idle. And will not hit power band. to get any power out of it i have to short short shift. So i was just curious if it could be something else? what would it be or is it the crank seal..kinda leaning towards the seal cause its worse. but i just wanted to hear what you guys thought it could posibly be. Thanks guys/gals.

 

[sharky243]

If it is smokeing alot and smells like burnt engine oil, it's definatly the crank seal. It's easy and cheap enough to change, so i would replace it again. Most likely you damaged it when you took it out.

 

[_JOE_]

It should be consuming tranny oil if it's running that poorly. It's pretty easy to mess the seal up going in and out like that.

 

[Eddels509]

Yea i kinda figured putting it in and taking it back out would of done that. Thanks. Also i was thinking since its splooging so much should i repack my silencer i have noticed over time it has seemed like its not silencing so well anymore.

 

[sharky243]

Sure !!! re-pack it. It is cheap and easy to do, and you can't really hurt anything by doing it. If it is burning tranny oil, you will notice more oily goo coming from the exhaust.

 

[whenfoxforks-ruled]

Depending on the actual usage, at least once a month on the packing. You will notice the difference stronger than changing plugs. Vintage Bob

 

[Matt90GT]

What year bike is this again? Be sure to examine that the power valves are working properly, especially easy on the 92-01 bikes. Those bikes if you dont put the 2 shafts lined up when installing the cylinder, the power valves will not work.

 

[Eddels509]

its an 86 cr250. the powervalves are working i'm pretty sure are working. it did have powerband a little while ago. but it was kinda weak. now there is none.

 

[whenfoxforks-ruled]

Sure sounds like a tired engine. On a fresh rebuild, and a leaky seal, you should still be able to find the power band, without a seeing eye dog. Vintage Bob

 

[_JOE_]

My buddy had an 88 that hit pretty hard. You've got mechanical issues.

 

[julien_d]

double and triple check the power valve.

 

[whenfoxforks-ruled]

86 and 87 was the production rule years. That bike rips! In decent mechanical condition. Roger Decoster said nobody could ride that bike to its full potential. Vintage Bob

 

[Eddels509]

yea the bike is a sick bike when its running properly..really strong bottom end. but if the powervalves are sticking (i'll check tomorrow) but if they are why whould it smoke? could it just be my luck that the seal and powervalve gave at the same time? would they get stuck from a ton of spooge? cause its spooging a rediculous amount. almost like its spraying out of the exhaust. thanks for the help.

 

[Eddels509]

so i pulled off my powervalve cover and the powervalve was open. shouldn't it be closed? but it moved freely i'll fire it up and see if its working tomorrow.

 

[whenfoxforks-ruled]

So far, so good. Vintage Bob