Maintenance & Technical > KX500 Original

KX500 BIG BORE KITS

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monster malibu:
Anybody know who makes big bore kits for the KX500? I'm not sure yet if I want one, but would like to know where to get one. My bike has alot of power, but more is always better.

Hillclimb#42:
 There are all kinds of upgrades on here to get power where you need it, but I'm not sure about the big bore kit. You already have a reed spacer, pipe and silencer, and fresh piston? I suppose you can get a new sleeve and bore it to whatever size, but the Kaws have the Electrofuse coating, which I think is an advantage over other mfg's. Stock cylinders are strong and easy to get pistons for. Like I said already, there are options to get more ponies easier. I would refer you to my engine builder @ Thomas Racing Service for a big bore app. I am 100% sure that he can do it in the same turn around as any stock cylinder, but I would not be in a hurry until you get alot of feedback about the pros and cons of the mod. This will be an interesting thread to watch, because I'm sure there are alot of opinions about this topic.

stewart:
i think you can make a lot of power very relieabley with stock bore and stroke

maddoggy:
i'm not completely sure but i think a big bore kit would involve boring out the cyl. large and sleeving it to whatever the desired size. heres the problem. anyone whos worked on diesel engines alot knows about the problems associated with sleeves. they tend to wear holes in them from internal electrolisis(or harmonic induced cavitation). the wear occurs on the water side of the sleeve due to tiny bubble explosions that are vibration induced. knowing the revs on these k5s are high, in my opinoin, the sleeve wear on a 2 stroke would probably be worse than on a large low rev diesel. however, if a sleeve kit is chosen then change coolant at least 1 or 2 times per riding season. the sleeve wear is excellerated when running out of spec. coolant in the engine. my opinion only,  MADDOGGY

BigGreenMachine:
Pretty sure Kustom Kraft does bigbore kits for the 500. They are a great company and have been into motor building for over 20 years now.

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