Nikasil cylinder cleanup pics and questions.

[RedneckChainsawRepair]

I wont use acid and I still clean by hand with emery cloth and finish up with 240 Grit Aluminum Oxide to cross hatch.

240 Grit Aluminum Oxide. Copy paste info = This type is recommended for cylinder coatings such as chrome and Nikasil.
Used to lightly surface the bore of your cylinder, creating a cross hatch of scratches that helps your rings seat tightly to increase compression. They also smooth over imperfections around intake and exhaust ports.

320 Grit Silicon Carbide. " " " ". This type of hone works on all surfaces including cast iron cylinders.

 

[CristiRo]

That cylinder looks nice!

@SoopermanLuva You did a fantastic job with that piston. Cleand out nice and that piston grove thing...

Just wondering...if you clean up a piston like that, won't cause any problems because of the tolerance increasement?

 

[SoopermanLuva]

That cylinder looks nice!

@SoopermanLuva You did a fantastic job with that piston. Cleand out nice and that piston grove thing...

Just wondering...if you clean up a piston like that, won't cause any problems because of the tolerance increasement?

Thanks! Yes, it will create problems. I have a picture of the intake side on here, which I just cleaned up with some scotchbrite and it does look nice. The exhaust side is quite a bit different. I slightly sanded it to get rid of sharp edges, but the scoring is still there. I wish I didn't rush it as much and made a picture of that side as well. I'll do so the next time I pull off the muffler. The piston is not round anymore and it never will be again. It's not a long term solution. I mainly wanted to restore the cylinder and the fact that the saw runs with that piston is a nice bonus. I'll replace it with a meteor or find a guy to machine a custom pop-up piston.

 

[SoopermanLuva]

Here is the saw after a quick adjustment. Has since been adjusted with a tachometer. Idles at 2.700 now. The very first start took about 6 pulls.