Building a new engine

[toolman]

I'm finally getting around to building a engine for a roller I bought a year ago. I bought most of the parts from the members here. I have used cases new trued and weled crank, wiseco pistons 65.5mm fresh bore on the cylinders pro circuit pipes (Fatties) Single 33 PKW carb and a Pro design cool head that came with 19cc domes. This is my question are the domes to small for a basic trail bike running at about 600 ft sea level. I would like to run pump gas. I run 927 castor for oil. Where is the best place to get new orings for the cool head.

 

Thanks

Tim

[Sammy]

With 19cc domes I would definitely run at least some 110 in it. How much timing are you going to run?

[278]

Yeah they probably are to small, but the best way to find out is to put the motor together and do a comp test

[wacko2000]

Im at sea level, and to run pump gas you are going to need 21-22cc domes.

With 18c domes you will have like 180-190 psi and will def need 110 octane

[toolman]

Forgot the timing I usally run plus4. Noss has a chart on their web site if remember right 19cc runs about 170 psi at sea level.

So I might have a set of 19cc dome forsale or trade. I will wait and put it togather and check the compression.

[swrbansheeboy]

i've got a bike running 19cc domes and +4 timing, it's got 165 lbs or compression and i've been running it on a 50/50 mix of 110 and 92 for about 5 years with no problems...