GP800 any idea on what kind of compression?

[Idok]

66e bored and resleeved to .5 over

Riva gas valves

Riva head with 42cc domes....




any idea as to what kinda compression Im looking at??

 

[WaveDemon]

low. maybe 150?

 

[JonnyB]

I just pulled out an old Riva Price list & tech info catalog that I have from 2000. On a GP800 66E motor with 41cc domes they say 150psi. The highest it goes on my Dome Chart is 41cc as a GUESS the 42cc domes should be 145psi

 

[surferdude345]

I think stock is 120 ?

 

[JonnyB]

I think stock is 120 ?

correct

 

[Idok]

so what I do want to run this baby at with my setup? if stock is 120 then 150 would be about right, correct?


I dont have a pipe yet, but eventually i'll probabbly throw down on the WDK dry pipe

 

[JonnyB]

your 42cc domes are perfect. I run 150psi on my gp800 twin dry pipes, Riva CDI set on limited curve, with 93oct spinning at 8050-8100 all day.

 

[Idok]

your 42cc domes are perfect. I run 150psi on my gp800 twin dry pipes, Riva CDI set on limited curve, with 93oct spinning at 8050-8100 all day.

nice.

although I cant really imagine turning 8k on a standup :brap: lol

 

[JonnyB]

nice.

although I cant really imagine turning 8k on a standup :brap: lol

:Eyecrazy: it would be fun till you fell off. If your not going to run MSD TL on the 66E. Send your CDI to protec they will bump up the rev limit and change the timing curve to a little more aggressive

 

[Idok]

how much compression can I run on pump gas??

 

[JonnyB]

I wouldn't go over 150

 

[Idok]

how bout race gas???

 

[WaveDemon]

jeff said 200 was fine for freeride. short bursts of wot only.

 

[Idok]

I doubt this setup will see much ocean time...


I might have me a little flatwater boat action for the river!!!!

 

[cookerq62]

Is this valves open or closed? The stock valves open when you hit the starter.