The tire rubbing against the chain guard could be due to the wheel fixed slightly side ways and not straight...check the left and right graduation ,used to check chain tightening alignment.
Going for 235cc with P220 piston is a good idea,provided the mechanic knows what he is doing...remember to change both the top and bottom gaskets of the cylinder head....also check for cam,rocker ,timing chain,chain tensioner, and chain guide wear.


. I told him it's a modded one from Zen mpfi and at first he couldn't digest it
( he's company trained in many earlier bikes - lol ) . Finally he adjusted it to 3.25 and I said I'll check it and change if required . It was on the return trip from there that I touched 118 - 119 on the speedo. I hadn't checked my top speed before that - mainly because my rides didn't require me going on the NH . Now I have a bench mark .
. The increase in pick up is -I think- in proportion to the increase in cc/power . I maxed out just below 120 kmph . I guess Vineeth still had juice left in his steed , but since his speedo wasn't working (suspected broken speedo gear) it didn't make sense for him to push it further . 



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