Re: Bad Mating Surface?
First off, get the mating surfaces as level as you can. Sure a slow drop can crack it, but its even more likely if the repair is high, and the cover is deflected and put under tension whenyou tighten down the bolts. I would rather the mating surfaces be .020" low that .010" high. Like LTL said, use whats called a semi-drying sealer. Yamabond is good, as is Three Bond 1104. It is all that is used for sealing cases on 2 strokes and the like. Clean all surfaces with laquor thinner before sealing.