The only time I have run in to chain skip problems is when the bottom jamb nut for the chain adjustment was not tight, or when the bushings wore out. I have since replaced the front eng. mount bushings with nylon bushings as well as the rear case bushing which I had to make myself. Also the adjuster bushing I replaced using an automotive polyurethane bushing custom fitting it since you want some flex in this bushing. I have had no problems with chain skip since. Most don't realise that the rubber eng. mount bushings do wear and get weak allowing for excessive flex in the engine, also most don't tighten the lower jamb nut when adjusting the chain.
TOM
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