I have 2 different oil pump types, one has a cover held on with 3 screws, the other is the more common one where the mounting screws hold the cover on. Both are made by Mikuni. Wondering if there is any functional difference? The gears and shafts are slightly different. I am wanting to replace it because the shaft on the current one is chewed up on the circlip groove from a previous clutch explosion, and I can't just swap the shaft.
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