Jump to content
Sign in to follow this  

Yamaha left side Crank seal

Recommended Posts

I'm curious: I was checking a new acquisition for no spark yesterday, a '74 DT175, and when I popped the cover a couple of cups of fuel ran out. It was from the new petcock, which is probably NOS, with a hard distribution ubber.

I say, even though they said it was running, albeit a bit logey, that if the left side Crank seal was good, it would not allow fuel to leak out. I'm going to restore this, so the engine comes out anyhow. I'm just curious of any saavy concensus.

Share this post


Link to post
Share on other sites

That'd be about the only explanation for fuel on the "dry side" of the case. The motor should be sucking air as well, so probably doesn't rev down well or runs lean perhaps.

Share this post


Link to post
Share on other sites

I removed the flywheel after work today and the stator plate. the seal is a "National"; not original, and the skin around the outer edge was "puffed" from the fuel. The nice thing is i can evaluate the bike for a bit prior to restoring. How cool that it's a vertical split case, and the seal is just an outside installed conventional seal.

Thanks again, tarzy!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×