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schinner16 10-29-2007, 02:38 PM does anyone know of a big bore kit for a Rotax series III 800 twin motor??? we have a few spare...scored up cylinders sitting around and were wondering if there were any big bore kits or whatever for it. 800MXZ 10-29-2007, 05:38 PM Crank Shop does a 870 I think. Just not allot of room in the 800 jugs though. rotax800 11-24-2007, 10:23 AM Cudneyracing does a 830 kit & from what I have heard it works really good & very reliable. Check out www.cudneyracing.com for more info on it or send them an e-mail. Bill Cudney is a great guy to deal with. I have bought many things from him & had no problems :D floyds57 01-12-2012, 07:38 PM Crank Shop does a 870 I think. Just not allot of room in the 800 jugs though. go to the web site rktech they make a 830 and a 860 kit. i have just installed the 830 kit am waiting for clutch parts then ready to rip supposadly 170hp for the 830 kit....floyd | ||