Super Jet Will i need to rejet?

[Goober]

So if all goes well i should be picking up a ski this weekend. it is set up with an ada head with 33 cc domes. Just wondering if i were to switch it up to 35cc domes to bring it down to pump gas will i have to rejet.

 

[Matt_E]

Depends on what gas it's running now.
Generally, you don't need to re-jet.
If you're switching from oxygenated race fuel to pump gas, then you may need to do something. It's unlikely that someone ran full-on race fuel on 33cc domes.

 

[Goober]

No they where running 50/50 i believe is what they where told to run.. compression is 200. Not sure if i will switch it up to 35cc domes or not, but was wondering if i had to rejet if i did

 

[Tyler Zane]

from what i understand you can run 33cc domes on on 93 as long as your not running wide open. but who doesnt like to run wide open...

this if from Jetworks for my setup yours may be totally different.

edit.. just checked my notes, 34cc domes are acceptable on 93 as long as your not making wide open runs.

 

[kevbo]

from what i understand you can run 33cc domes on on 93 as long as your not running wide open. but who doesnt like to run wide open...

this if from Jetworks for my setup yours may be totally different.

Depends on how picky you are about tuning. Ideally any changes should get a high speed retune with a tach. Part throttle tune will be obvious.

 

[Tyler Zane]

Depends on how picky you are about tuning. Ideally any changes should get a high speed retune with a tach. Part throttle tune will be obvious.

i agree completely. i was just speaking in general.

 

[kevbo]

The part throttle tune will act leaner with compression reduction, timing reduction, or steeper prop. Your prop may need to be adjusted to get back some low end.