I have a 20v in my aw11, with the factory 20v extractors (4-2-1) and there are no issues with fouling of the starter motor, and I'm using the original aw11 c52 box. However the starter is mounted on the opposite side to the extractors (there's two possible locations remember). although I can't even remember what side it was mounted with the factory engine![]()
Can't answer your other questions with any certainty
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