The ignitions are interchangeable and will definitely give a different feel to the power of the bike. The heavier (and milder) ignition has wires that come out of the motor at 2 o'clock. In my experience it will soften the hit more than the lighter ignition with a 10 oz. flywheel weight.
I'm a slow "C" rider and I prefer the heavier ignition on my 300 for the tight trails I ride. On the 250 I'm happy with either ignition as long as the lighter one has a flywheel weight added. Faster riders probably prefer the lighter ignition on both the 250 and 300 and add weight to suit riding conditions. - Ken
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