Originally Posted by N1EDM

Overall, the engine has been cleaned up nicely. It was just the valves that were rather gunky. Since that last post, (34524 and 34525 on page 1381) I have run the engine up with a 13x6 prop and got about 9300RPM on it. I think that was pretty good, actually. I just didn't want to pull the valves (and lose the springs) unless I had to.

I'd heard that one should try squirting some WD-40 into the intake, and other guys said not to do this. Has anyone heard of this, one way or another???

For the record, I use Denatured Alcohol quite a bit for cleaning a lot of things, but it's not that effective at getting deep castor oil off.

Thanks for the input,

Bob