Maintenance & Technical > KX500 Original

Can you tell me if this is normal for piston ? pic inside

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500bigbore2k7:
My piston has scuffs on one side of it and the cylinder has the same scuffs on it to is that normal ?  Is there anything i can do to remove the scuffs from the cylinder wall ? Is there any thing special i need to do before i install the new piston and rings ? My compression was at 90 psi when i tore it down, what should  the compression be around when i put the new wiseco kit in it and will it be much faster ?? thanks

Platypus:
105-164 psi...found that info in someone elses thread.

dcollins4328:
It sounds like it has been a while since someone did a top end.  I might recommend that you get your cylinder resleeved with nikaseal, and then put a new piston and rings in, otherwise you will wear out the new ones if you put them in a worn out cylinder.  It cost Big $$ though

500bigbore2k7:
i looked at the cylinder again and it seems to be come right off when i rub it, its more like grime than actual scuffs in the piston and cylinder.  do i need to re hone the cylinder or what can i scrub it off with ?  Also how do you get the torque specs right on  the 4 nuts on the bottom of the cylinder when i put it back together. i had to grind  a wrench to get enough clearance to get the nuts off. thanks

Polar-Bus:

--- Quote from: 500bigbore2k7 on April 02, 2007, 07:38:22 PM ---i looked at the cylinder again and it seems to be come right off when i rub it, its more like grime than actual scuffs in the piston and cylinder.  do i need to re hone the cylinder or what can i scrub it off with ?  Also how do you get the torque specs right on  the 4 nuts on the bottom of the cylinder when i put it back together. i had to grind  a wrench to get enough clearance to get the nuts off. thanks

--- End quote ---

It's impossible for us to diagnose the severity of your cyl. scuffs without actually looking at them. Generally I tell people if you can feel them with your fingernail, the cyl is junk and needs to be repaired. That piston you have pictured siezed from dirt.

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