Mine was running at 26hp before the piston failure on a tsr exhaust and 30mm carb with an li150 box, that was on a 58/107 crank, I’m upping it to 60 to hopefully gain a bit more torque and be able to rev out fully all the time rather than just on still days, it’s a good all rounder at the moment being thrashed down dual carriage ways to work and back every day but I just think it’s got more in it
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Monza rebuild options?
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