Maintenance & Technical > KX500 Original

Nikisel / Cylinder and piston ? Pic's MERGE TOPICS

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jigggawatt:
I pulled my motor apart today. This is what I found. It ran good and the cylinder feels smooth. Should I have it replated ? If so who should I have do the work? What else should I have done to it while apart? The piston looks washed out on one side . What would've caused this?

                                                          Thanks,Jim

hughes:
The piston is done throw it in the trash and order new topend kit. The clyinder doesn't look bad at all. You can still see the cross hatch in the clyinder walls. Check for cracks around the ports, check the plating around the port openings to see if is chipped away, A ball hone can clean up that clyinder if there is no scoring. Looks like light scratches in the cylinder and no alumn. transfer. If you question the clyinder have it replated by lukesracing.com. From the photo's I would ball hone it and run with it. How's the lower end of the engine? Does the crank roll over smooth?

don46:
I agree with Hughes regarding the piston, trash it. With regard to the ball hone, you shouldn't use a ball hone on a plated 2 stroke cylinder, the balls fall in the ports and due to the design of the hone they jump out and slap the cylinder, this can cuse the plating to fail. Wiesco has flexible hones that do not have balls on the ends and are reccommended for 2 stoke cylinders. I would look around the exhaust port, that seems to be the first place the plating starts to flake, there was a spot on one of the photos that looked like aluminum showing, check it real good.

Plated Cylinders: (Includes nickel ceramic coatings (Nikasil), chrome, Electrofusion, and boron composite.) If the plated cylinder is in good
condition, honing may not be necessary. If deglazing is necessary, DO NOT use a ball hone. Use a rigid or brush type diamond hone. Plated
cylinders cannot be bored oversize without replating or resleeving.

jigggawatt:
Thanks I give lukes a shot . I just split the cases and put new crank seals in, bearings are ok.

KXcam22:
I only use ball hones in a 4-stroke with no ports. On plated cylinders I like to hone by hand with some 400 wet & dry and wd40. That way I can concentrate on the areas that need it but remove only the minimum material possible. It's easy to get a nice cross hatch by hand. Cam.

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