[Mule]

The factory oil injection settings were way too rich. Once you backed it off enough (carefully), the plug fouling went away & the engine came to life. That trick along with matching those little manifolds to the cyls and cutting back those copper rings on the exhaust plus a set of jets and it was on like Donkey Kong. Port timing on 500's was already so radical that any more would have made it undrivable. Mine was beaten twice (both avenged) due to missing gears, once to an H2 (750) and once to a sportster.