Measured the compression on my new to me Daytona (16k miles) and got a measly 65lbs per cylinder. Bike is still running well and making plenty of power.. any reason not to wait a few more months before a rebore?
you absolutely sure the gauge is accurate? 65 is pathetic, I rebuild at 90 ish. I got bit by a low reading gauge once, I'd verify it's accuracy 1st
Quote from: m in sc on June 23, 2025, 10:56:01 AMyou absolutely sure the gauge is accurate? 65 is pathetic, I rebuild at 90 ish. I got bit by a low reading gauge once, I'd verify it's accuracy 1st
I found that a lot of good looking economy priced pressure gauges read low. I have several good gauges that I use, but you also have to pay attention to the throttles which must be wide oen and did you kick it once or keep kicking until it peaked - typically 5 or 6 kicks?
Make sure your gauge has a schrader valve right in the piece you screw in the spark plug hole.
Quote from: m in sc on June 23, 2025, 10:56:01 AMyou absolutely sure the gauge is accurate? 65 is pathetic, I rebuild at 90 ish. I got bit by a low reading gauge once, I'd verify it's accuracy 1st
Do you test hot (running temp) or cold?
65 is very low , if the bike is running well then surely the gauge is not accurate , 120 125 is the start on stock and 90 is the bottom line I guess..
Get the readings with some other gauge and check !
Cheers,
Pravin