Twin 717 w/single carbs, needle valve size.

[David Shore]

Finished the 717 rebuild for the GTS, finishing the first Challenger 717 rebuild and just decided to buy the whole second engine for Challenger cause it needed top and bottom rebuild.
My question is about the carb settings:
First Challenger engine has 1.5 needle valve with spec pop off.
The second carb has a 2.0 needle valve also spec pop off.
Should I replace one of the needle valves so they are the same pop off pressure?
Even though currently different size needle valves are within spec pressure.
So far I’ve been told that it was how they came, the 2.0 valve was on the engine further away from the feed?
Thanks!

 

[mikidymac]

Look at the parts diagram for your year challenger to see what size is required. Looking at a 2000 both should be 1.5.

 

[David Shore]

Look at the parts diagram for your year challenger to see what size is required. Looking at a 2000 both should be 1.5.

Yes, thank you.
I’ve read mostly in the threads not to change anything, I wasn’t sure if it was changed for a good reason but I’ll stick with spec valve.
So the bigger valve further away from source is not accurate? (FB page, I’ll stick with this forum for the right answers from now on,lol)

 

[mikidymac]

Depending what model the engine was in seadoo would change the springs and seat size.

Go with what the parts diagram shows for your model and verify the jet size alo.

Do not trust the FB groups, they are full of people that love to pretend to be experts and don't know anything.