Putting in new rings

101racing

New member
What do u guys do when u rering the piston. We did scotch brite on 07 ktm 300 cylinder or do you hone with a special stone?

Thanks:)
 
Hope like hell the rings fit!!
My first top end ever .. on my 06 300 really only needed new rings ... unfortunately the rings shipped did not work in the stock piston .. it turned into a little mystery as the part number was correct and the rings inside the package were correct. They just did not like the stock piston ..I had to get a new piston and rings.
 
Well some people just use scotch bright but really that Nikas lining is supper strong.

To do any realy good just take it to a shop and have them use a diamond hone. It should cost $30 at max then you know the bore is straight and what not.
 
i thought your're not supposed to hone nikasil bores?
It's pretty tough. Scotch-Brite ain't gonna touch it. If you have any aluminum on it, from a melt-down, then apply muriatic acid with a Q-tip to remove it. Might have to sand a bit too. When Q-tip is clean you should be set (no more aluminum). Better to get diamond honed, as stated.
 
Scotch brite

Did u (gasgas man) get 3 in ball hone for nikasil application and what grit did you use. I dont know if i can get diamond hone or not but i will see what my dad thinks.

Thanks for all the replies
 
Last edited:
101.
The ball hone I used is just a standard 3" version.
I don't think they make different grit hones.

The idea is just to break the glaze off.
Usually, 3 times up and down will do the job. You want a 45 degree cross hatch pattern when you're done.
Use WD40 to lube it while honing.
 
You wont be able to afford a diamond hone. The 3 ball does nothing on these cylinders because the plating is much too hard. Plus you run the risk of making un-square. Just take it to a machine shop or bike shop.
 
Wow, I have never seen a subject that has so many differing opinions! And now I will add mine....
Seems I have read that the nikasil plating is pretty thin and that neither bar-type hones or ball type are recommended because of the chance of wearing through. Scotchbrite is what was recommended and like Brian VT said muriatic acid to remove any aluminum that may be present (use appropriate safety precautions). That being said I tried scotch brite and didn't have any luck whatsoever trying to make things look the way "I thought" it should and I didn't have any aluminum to try to clean off.
If there is any cylinder taper top to bottom a bar-type hone will not clean it up until you come close to (or do) wear through the plating. That leaves the ball hone which does a good job as long as all you do is de-glaze just as gasgasman said. It will also clean uneven surfaces (cylinder taper). I have also used bar hones with a scotchbrite pad between the hone and the cylinder and that works good too. You just have to remember you are just trying to deglaze, not bore to the next size! And use plenty of clean lube.
 
Wow, I have never seen a subject that has so many differing opinions! And now I will add mine....
Seems I have read that the nikasil plating is pretty thin and that neither bar-type hones or ball type are recommended because of the chance of wearing through.

I have to agree with this statement 100%. But have to add, using a ball hone will work good for an experienced machinist about 20% of the time. THE most important thing is; NOT to nick or damage the port opening where the 'flash" raps around the port window opening.

If this area is removed or cut open, or chipped, then the plating on the cylinder wall can start to flake off or layer off, and that is a very bad thing to happen.

It is a little more work (elbow grease), but the 3M Scotch-Brite pad in the kitchen sink with warm soapy water does the best job for a plated cylinder in a top end rebuild.

Thank you,
Ron
 
scotch brite

I think i will go with the scotch brite we had good results last time. i am thinking about doing a little porting just line up everthing and smooth some corners. think thats a good idea? I am going to race in cascade this weekend! Thanks
 
I have a Scotch Brite hone. Its made up of a stack of Scotch Brite pad discs on a mandrel. While not actually designed for the application, it works great on a 250 size cylinder.
 
Scotch Brite makes a bunch of different pads, could someone tell me exactly which one is suitable for cylinder bores? Thanks
 
Back
Top