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  1. #1

    Join Date
    May 2013
    Dallas, Texas

    Installing 1200 cylinders onto 63m???

    I am a second round newbie to this site. I was active on here back in 07 when I had a RXP but now I am giving 2 strokes a go and have read almost every thread you can read over a 63m but still have a few questions.

    I have seen the info on boring vs 1200 cylinders to get to 1200cc (actually less) but was wondering if I used 1200 cylinders can i bore them and install over sized pistons? and if so, what mm pistons would they be and how big would that make the engine?

  2. #2
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Madison, WI, USA
    86mm is the largest GP1200(65U) pistons I know of and that puts the engine at 1185cc.
    Stock is 84mm and 1131cc

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