Lets see how smart u guys are.......

Location
Ohio
Yea I was wondering that one too.


And I did not re read all of this but did comp change after porting? As it should, right?
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
What he is saying is the same dome read's 15 psi different between a 61x piston v.s. a 62t piston are you sure you have 61x piston's ?

It has nothing to do with the pistons. A 62T cylinder has higher exhaust ports than a 61X cylinder. That's why there's less compression.
 

SUPERTUNE

Race Gas Rules
Location
Clearwater Fl.
Learn to do a cc check for the measured compression ratio and use the exhaust duration for a correction factor. My bet is a weak starter system. Note I said SYSTEM...that means everything related to the starter and including the starter.
The battery, all 3 battery cables, solenoid relay, bendix and the starter.
If any of these items are weak, your compression reading with a guage will be low.
 

LIVE2RIDE Powersports

Live & Die 2 Ride
Location
WorldWide
Learn to do a cc check for the measured compression ratio and use the exhaust duration for a correction factor. My bet is a weak starter system. Note I said SYSTEM...that means everything related to the starter and including the starter.
The battery, all 3 battery cables, solenoid relay, bendix and the starter.
If any of these items are weak, your compression reading with a guage will be low.

Wow. I will check that soon when i put my total loss on.
 
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