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[QUOTE="KX_OUTLAW, post: 1383272, member: 119129"]
I have a KX85 with a 100 big bore/port kit. 
The first cylinder I put on it got externally damaged so I ordered one with the same specs. With the 1st cly it had a gallon of fuel run through it, I just took a cold comp test before pulling it, it was 180 psi.

The replacement cyl was done to the same spec, and I measured everything also, used the same head, same piston, new rings, new oem gaskets.

1st cly I broke in as recommended which was just warm it up, take it easy up to 3rd, don't go wot for about 30 minutes, let it cool and it's done.

When I took that apart there were about five .125(inch) wide lines that wore the cross hatch off, the piston looked new.

The new cylinder I broke it in using this method:

Now it has about a gallon of gas run through it, it's always had more of a ping sound to the pipe (the normal 2 stroke sound), and it runs stronger.

Only thing is it has about 150 psi hot with 10 kicks, maybe 165 cold.

Same oil, same cold temp.

Normally I wouldn't have even checked since it runs so good, but I read to much I think.

Nothing to worry about?
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