when you say comparable times with a P1......it your lads cadet chassis ballasted up to the MSA minimum of 103kG with him in it?..... or are you say 90kg?......again that also makes a whopping great difference and could be masking the truth of the matter.
"higher moment of rotational inertia".....you sound like an engineer!
the problem with honda engine on the right is most pronounced under hard breaking, where the kart will pull to the left.......like andy says the big heavy cast iron flywheel is well out on the right hand side.
when we transferred from an intrepid Maky (engine on right) to a 2012 P1 (engine on left), we immediately went 3 seconds per lap faster at rye-house and using the same engine and tyres, I just couldnt believe it......a mate also did the exact same swap from Maky to P1 and found 2 seconds at Wild-trax......they really are that crap.
yes anti-clockwise circuits will help, but its not the norm.......on a clockwise circuit it will be too much weight on the rear right and the chassis will not release properly off the corners, a fundamental requirement for a cadet kart to perform well.
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