Low Compression

[DesertCR]

Well I just recently got the motor back in the bike after a broken piston. Had it bored .25 over and I dont think they did a good job, the end gap was .019 (.021 is service limit) and just about a couple hours ago I decided to do a compression test. It could only muster about 110psi, (Matco comp) and I know thats low. Could it be anything else but cylinder/piston? Should I just send the jug to GSS and have him bore it over .50?

[britincali]

If it runs good stick with it, my AF has shitty ass compression and still runs tits.

[DesertCR]

Yeah I was thinking about just running it. I mean it still seems to run good but could it be anything else, pipe, etc? Also I noticed that the radiators seem to get pretty warm compared to my cr250. This was the same case in the other frame but now I have different radiators, so it cant be them. The waterpump seemed fine and rads look good too.

[100hp honda]

stock motors are pretty low compression to begin with. your rings didnt seal good it sounds like. i would just run it. did you torque the head correctly and the gasket sealed good ?

my YZ465 with 21 year old piston had 105psi and still ran good for being that old. although it was alittle low compression

[DesertCR]

She seems to run good, but how hot should the rads get? I mean my 250 seems to run much cooler than the 500. Is it common for 500's to run warmer?

[south central hoon]

is it boiling over? just ride it!