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honing nsr 150 cylinder

Discussion in 'Technical and Troubleshooting Torque' at netrider.net.au started by nicka9x, Sep 23, 2009.

  1. I am about to install new a piston and rings. The cylinder looks fine but since everything is now in pieces I thought it would pay to have the cylinder Honed. The cylinder honing tools that I have seen are fitted with 220 grit stones. 320 is available. Has anyone had their cylinder honed and what grit stone were used.

  2. I may be wrong, but I suspect that the NSR has a nikasil cylinder or similar, in which case, I'm fairly sure you're not supposed to hone it or you might bugger up the coating.
  3. Thanks for the reply patB
    I knew about the nikasil coating but did not know that it could not be honed. After doing some research on the net I found some interesting information about nikasil coating. After the plating is done, the bore has to be machined to the correct diameter. This machining process is what leaves the cross-hatch. If you attempt to hone a plated cylinder with a traditional hone, you will damage the bore surface. The hone can snag in the ports, chipping the edges of the plating. And instead of restoring the cross-hatch, the hone will simply smooth the ridges of the machined cross-hatch, giving you lesscross-hatch than you started with.
    I might just use a scotchbrite pad to clean up "piston residue" off the cylinder wall.