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I'm pretty sure it would be too big, plus the motors are mounted completely different with the open cradle frames on pit bikes. With the money and time you would put into this conversion you would be way better off getting a mod 50 motor. You can definitely make those motors RIP, a dual overhead cam fiddy would rail on a 100 motor.
 

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How long have you had the piranha motor/ how many hours do you think you've put on it? A genuine honda motor will run forever and be way more reliable than any china motor. Why put $1200 into a motor? So you can ride it for as long as you want (with regular maintenance and rebuilds, like any motor) I figured out a long time ago that trying to cut corners and get the cheap stuff for pit bikes is a terrible idea in the end. with that said, I have heard of numerous people who love YX motors, Gary from STR even told me once that he liked his more than his daytona BUT he also stripped the motor completely and changed everything China didn't do right. Personally, I hate the way china motors feel, rev, shift, ride, lol I can't stand em. Post this same thread in the 50 forum and people will laugh at the thought of putting a 100 motor in a pit bike. They are designed completely different, with the head and cylinder sitting on top of the bottom end. Even if it were done, it still wouldn't be fast because of the gained weight of the motors, but mainly because there aren't even close to as many performance parts for a 100 motor.



With all that said, if it were me, I would buy a used MOD 50 motor off the classifieds here for $500-$800.
 
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