250!?! WOW, where'd you get that one? I paid well under 200 WITH shipping for all of mine.

People have fitted other carbs quite successfully- Walbro, Mikuni and Del'Orto's.

B5HS NGK plugs work great, as for the coil, there are folks working on that as we speak.

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If it ain't broke, and you mess with it long enough, it will be.