When I first got the bike last year, I did a compression test and got 110/115 psi.
After two months I replaced just the rings and the compression went up to 120/125 psi.
I just got my cylinders back from Jeff with a fresh hone and bore, new pistons, top end gaskets and new seals.
I got done earlier putting the motor back togheter and when I did a compression test I got 160/165 psi.
My question is, what could be causing the 5 psi difference?
I did a leakdown test and it hold 6 psi for 6 minutes.
Also since my compression is around 165 I went and got a five gallon can of power mist
t105 racing fuel which claims to be 109 octane. Should I run a 50/50 mix?
Mods are:
+4 timing
20cc domes
FMF Gnarly
pro flow with K&N and lid on
VF3s
stock carbs, 290 main, 27.5 pilots,
needle on stock position
airscrew 1 1/2 turns out
sea level
80 degrees temperature
Thanks for any advice guys.