Maintenance & Technical > KX500 Original

replace piston and rings without replating cylinder?

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moreccsthanlbs:
just curious, i have a 2000 kx500 with 500,000,000,000 hours on it :-D still runs great, good compression, starts up 2nd kick every time, but it is starting to smoke a little bit. i'm guessin it could use a new set of rings just to freshin it up. i figure since i'm gonna be in there, i might as well put a new piston in also. do i need to have cylinder replated? if everything looks good can i just slap a new piston and rings in it? thanx in advance.
p.s..... or should i just leave it alone, like i said, it does run VERY strong still

kaw rider:
check your compression first.

Texas Champ.:
If it's smoking it the mix oil/fuel...on 2 stk. engines the rings don't control the crank case oil...that's in a seperate area of the motor...the only way you can get the bottom end oil into the top end is to have bad crank seals or the case to case seal is leaking...km

KXcam22:
On my 92 I replaced the piston and rings after 14 years of service. Feel at the kick starter told the story and a compression test confirmed it.  The cylinder plating and KIPS wear was fine so all I needed was a piston and rings.  A visual inspection of the cylinder should show if the cylinder needs replating.  Tough bike. Cam.

adrenalinejunky81:
New piston/rings is never a bad idea. Use some wd40 and a green scrubby to de-film the cylinder liner before installing, but as you probably already know, dont hone it. Just removing the carbon/oil residue is all thats needed if measurements are in spec. Giant piston=large surface area and less wear, probably a big reason 125s get rebuilt every season.

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