Maintenance & Technical > KX500 Original

Nikisel / Cylinder and piston ? Pic's MERGE TOPICS

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hughes:

--- Quote from: don46 on March 06, 2007, 09:43:09 AM ---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.

--- End quote ---

I agree that a ball hone might cause an issue with plated clyinders. I have used them in my plated cylinders with great results. The key is getting the correct size hone, and speed in which you trun the hone, and the grit. My only fear has been that the ball hone my chip the plating on one of the port edges. If a 2-stroke engine has sleeves installed then a ball is great with no ill effects. I have tried KXCAMM22's method and it works. I like the results that those brush style hone give you. 

don46:
Hughes is exactly right a ball hone can chip the edges of the ports, wiseco has really trick hones that eliminate issues with chipping, but are flexible. A rigid hone works well also, not the spring loaded types purchased at a local auto parts store, but something on the order of a sunnen hone. I'm not sure I would do the sandpaper and wd40 deal, I guess it would sork but the whole idea is to maintain a uniform cross hatch pattern around the cylinder.

hughes:
I have seen the results of those brush style hones and it's cool. I just have not used them myself. These things look like a brush and it de-glazes the cylinder a lays down a nice cross hatch. I'll if I can find one on-line. Lukesracing.com will clean and hone the cylinder for around 50.00

hughes:
http://www.coolskunk.com/Two%20stroke%20into.htm

Scroll down to: Honing the clyinder bore. Eric Gorr uses ball hones on his 2-stroke rebuilds.

CAduner:
I was wondering if anyone has redone the top end and not had the cylinder re-plated?  And, if so what happened?

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