1981 WR 250 - Fuel in Transmission

Left the pit-cock open on my fuel tank coming out of the mountains of CO. on my way back to Dallas. Started the bike when I got to Dallas and it spit out of the breather tube, transmission oil with fuel mixed in. Obviously, the altitude pressure forced the fuel from the tank through the carb and into the cylinder. I drained the transmission and flushed it with new oil a couple of times.

My questions are: Does the transmission oil, lube the lower end of the crank too or do I have a situation where a seal has failed allowing fuel to get into the transmission therefore requiring me to tear into the engine? My second question would be, has anyone experienced this before and what was your experience / repair?

I'm hoping that it is just a case of raw fuel being forced past the piston rings and that my flushing the oil will have resolved the issue.

Thanks for the help.

Regards,

Luckypuck77

to add to Motosportz..
in the past iv done the same..whats happened, is the fuel gets past the rings or if the piston is at TDC or close to it, it fills the lower end..if you would have push started the bike, it would have a fountain of fuel comming out the pipe..
you could have a wheepy center case gasket as well, really had nothing to do with Alt, change.
just leaving the petcock on, you may replace the fuel valve,,{needle and seat}.

Your story is rather strange. I have flooded the lower end a few times by leaving the gas on and the needle valve in the carb didn't work well. I never could start the bike without turning the bike upside down and taking the plug out and kicking it through and then airing it out. Well once after going upside down a guy pulled me with his pickup and it started but the next time I went riding a reed broke and I did a lot of walking so I won't try that again. The fuel must be coming in from that seal on the drive side of the crankshaft, can't see how altitude has anything to do with it.

I concur. The same thing just happened to me; filled the entire bottom end with premix because my petcock is shot. Fortunately the gas did not leak into the tranny. I've cleaned up my original petcock a few times but I guess after 26 years it has finally decided it no longer wants the job.

For what it's worth, I just bought a brand new petcock from Hall's Cycle in Illinois for $22 (in stock). Just arrived today so it's not even mounted yet.

I have a 1/16th pipe plug in the bottom of the case in all of mine. 250's have to be carefull of the "double wall" crankcase. Big bores is easy. Guy who told me that had watched me try to start my flooded 500. Finally got a tow. I have a bad back and cant tip my bike over so I pull the plug. Scott

pretty sure

from splitting my engine on 390 cr right side bearing is mist lubricated by premix and left side is lubricated by gearbox oil hence seal on inside on left side,as left side is mehed in oil same as other gearbox bearings.

John,

I still haven't mounted mine so the p/n on the package is 800043592. I don't know what the original Husky p/n is though. Just so you know, the new petcock package does not come with the two tank mounting screws. Here's another tidbit, the new petcock has a reserve position My original one does not. Happy spending!

Tom