Posted by Leland Jordon on March 26, 1999 at 13:06:55:
In Reply to: Sticky Piston Valves posted by Paul H on March 25, 1999 at 18:43:07:
Yet another possibility, in case it hasn't been checked:
Are the valve guides free of blemishes & burrs? The plastic guide has an ability to allow slight nicks to adversely affect performance. If that's the problem, try smoothing the guides edges just a bit with a few touches from a nail file or emery board (VERY carefully, of course, to avoid scratching the piston).
Even with that problem, I much prefer an easy-to-replace plastic guide than a really-difficult-to-replace metal one anyway. That's a piece that's going to get ground down no matter what, and easy maintenance wins in my book.
Seeya,
Leland