whats the best overbore for kx85
#1
whats the best overbore for kx85
whats the best or easyest overbore for the 2002 kx85 i was wondering if a kx100 cylinder will fit on easy? if so what jetting to use or just use kx100 carb? i seen a bunch of companies that have kits but they cost as mutch as a kx 100 motor on ebay. the girl that races this bike is not big enough for a bigger bike yet. but she needs more power NOW as she is racing against other girls on full size bikes.any help or ideas would be greatly apreciated
#2
RE: whats the best overbore for kx85
If I'm not mistaken I think a kx 100 has the same frame. Just like a big wheel kit and a bigger cc engine. As far as the engine heads interchanging I can find in about a week and I will post you back.
#3
RE: whats the best overbore for kx85
thanks id apreciate that we just got a pro circuit exaust system but she needs a lot more i already know the 85 and 100 frame is the same thats why the 100 motor is an option i also found a company that uses the 85 cyl on the 100 motor to make a 99 cc but they dont say if theres any machining and they get like 850.00 and thats what i see 100 motors going for on ebay
#4
RE: whats the best overbore for kx85
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These guys do nice 99cc overbore kits for about $800, a 105cc bore and stroke for $1800: http://www.maxpower-engines.com/big-bore-kits/kx99.htm
Or you can put in a 2mm stroker crank from Hot Rods for about $200 during a normal overhaul.
#5
For the 2001-2013, the bottom end for the KX85 is the same as the KX85. Gaskets, cylinder, piston, rings, head from the 100 bolt right on to the 85. If you can find a used cylinder in good condition, ship it to PowerSeal for re-nic. They do an amazing job, good price, and the bike will absolutely wake up. I did it for my son. We started with a used 100 cylinder and he liked it. When we blew the top end, I sent my backup 100 jug to Powerseal. When he got it back he said it absolutely lit up, and wondered what else had I done to it (did you add nitro, Dad??).
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