My '89 KX250 smokes like crazy and I've been going on the assumption that it has a leaky crank seal. Trying to build a pressure tester but haven't found a suitable plug for the exhaust port. Here's some specifics on the bike and I do appreciate any assistance:
Compression: 173 psi
Fuel: 32:1 Yamalube semi-synthetic/89 octane pump gas.
Carb: New Keihin PWK39 from Carb Parts Warehouse (prejetted by them and I didn't check what they put in it).
Bike smoked when I bought it (with the old stock carb). I screwed up and soaked the carb body, killing those special o-rings, hence new carb.
It sat from 7/02 until last weekend when I revived it. Some yahoo had stripped the tranny drainplug in the past so over time it leaks it all out. I started the motor the other day with no visible oil in the site glass since I figured I was just testing the motor and not the drivetrain. The glass is low on the engine, maybe lower than the crank seal itself. It still smoked like crazy so how can it be burning tranny fluid if it didn't have any in it? I topped up the tranny and it made no difference in the amount of smoke. What else could be causing this embarrasing excess smoke?? I'm afraid to take the thing into public but would love to ride it.
Thanks!
Steve Bleakley
A BMW guy with a few old dirtbikes.
Compression: 173 psi
Fuel: 32:1 Yamalube semi-synthetic/89 octane pump gas.
Carb: New Keihin PWK39 from Carb Parts Warehouse (prejetted by them and I didn't check what they put in it).
Bike smoked when I bought it (with the old stock carb). I screwed up and soaked the carb body, killing those special o-rings, hence new carb.
It sat from 7/02 until last weekend when I revived it. Some yahoo had stripped the tranny drainplug in the past so over time it leaks it all out. I started the motor the other day with no visible oil in the site glass since I figured I was just testing the motor and not the drivetrain. The glass is low on the engine, maybe lower than the crank seal itself. It still smoked like crazy so how can it be burning tranny fluid if it didn't have any in it? I topped up the tranny and it made no difference in the amount of smoke. What else could be causing this embarrasing excess smoke?? I'm afraid to take the thing into public but would love to ride it.
Thanks!
Steve Bleakley
A BMW guy with a few old dirtbikes.