No adjustment on the opposed twin, however make certain that you have a really solid ground to that engine. I have seen more people throw starting related parts at these, only to find a poor ground connection.

Thanks for that information mr. bushleague, I will clean off the old ground connection and maybe add a second ground...

Good advise above, but none the less- they eat starters. If it is an oil burner, there maybe some benifit to decarbonize the cylinders.