Uneven cylinder pressure

[SuperDave4x4]

I just had my 650 bored .75 over with all new pistons, rings, gaskets and seals. I got the engine back togther and just finished putting it in the ski, but I checked my cylinder pressure and its 150 in the front and 155 in the back. What is going on here???

The engine has:
44sbn
BCW intake manifold
westcoast head with 30cc domes
Coffman exhaust and Coffman waterbox

The reason I had to bore it out was bc the front piston had a hole in it when I got it. Some of you may have seen my thread on the other forum....

Any ideas on what is going on?

 

[Boris]

Have you run the motor yet ?

5 psi is nothing to worry about.

 

[Jayski]

If its before you have run it, its prob because you have oil in the front pot from when you assembled it.. helping seal the rings... only other option is the O-rings on the head are leaking, often happends when the head isnt flush-

 

[SuperDave4x4]

Have you run the motor yet ?

5 psi is nothing to worry about.

Nope, sure haven't. I just got it in the boat last night.

 

[Freakrider]

Have you run the motor yet ?

5 psi is nothing to worry about.

agree...could be the difference in oil in cyl...be happy you are within 5 psi...

 

[ADDict]

I've had them come in 10 psi off before, and be even after the first ride. As posted above, I wouldn't be worry about 5 psi, if you came in 25 psi off, might be a different story. Go ride!

 

[SuperDave4x4]

Well thanks for the encouraging words fellas! I've almost finished running the cooling lines and what not then I'm gonna back it into our little pond on a trailer to check the water flow.

Ill let yall know how it turns out.