Alwyn wrote:

It solved the top-end richness but the bike is still very heavy on fuel if you putter around.

18's do like a drink .An 18 with the same mods as a 21 will use 2 tanks of petrol for every 1 tank of petrol that a 21 uses .
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Harley Davidson is the worlds most efficient way to turn petrol into noise without the harmful side effect of horsepower.