Originally Posted by
John_M_
Try Berts suggestion, red loctite or the loctite Bearing retainer, which should wick in under a vacuum for sure, good idea actually.
I saw it used in repairing cracked car windows, and I believe it also is sometimes used to fix difficult leaks in oldtimer parts. It won't work in larger engines, but I think it could work in small fourstrokes, especially at the intake seat, which does not get particularly hot...