Super Jet Time for a rebuild?

[r12xmark]

I have a 2013 superjet with basic mods, ada high compression head 35cc domes, jetted carbs, factory b pipe. Ski has over 100 hours on it, tune is pretty good but lately i feel the power just isnt there anymore. Has a hooker 9/15 prop with blowsion freestyle cone too.

What should my
Compression reading be when i compression test the ski? And if its low does anyone reccomend a piston setup for this ski? Always lookin for more power.

Let me know some input

 

[Vumad]

Compression numbers should be available on ADAs website. I believe off hand the 35cc domes are 180psi. This number can change depending on your porting, base gasket, etc.

I have been pleased repeatedly by pro-X pistons.

 

[r12xmark]

It says 185lbs on ada's site for the head I have. So im guessing I should be close to 185psi when i compression test it later. Is it accurate to get the reading when the motor is cold or when it is at full running temp? Also compression reading with throttle held WOT right?

 

[Vumad]

I always check it cold, held WOT, and crank it until the needle stops going up.

Extra oil in the cylinders can artificially raise the compression, but that shouldn't apply to your situation.

 

[r12xmark]

Alright. Ill
Check it tonight and post my
Numbers

 

[r12xmark]

Dead cold ski havent ridden it in a week. Compression tested it holding throttle WOT and readings are 180/182

Maybe im just used to the power or needs better tuning

 

[Quinc]

It is also late summer and hot out side. The warmer the air the less power you will have compared to when you where riding in early spring.

 

[tor*p*do]

the little basket strainers in your carbs
may be filling with crud making ski less responsive
clean them out

 

[r12xmark]

Well rode the ski yesturday and it felt absolutly amazing This ski
Seems like night or day sometimes it amazes me and other times it feels weak i guess ill just go with that the ski is perfectly fine lol

Guess ill work on other mods to the ski now

 

[Vumad]

Well rode the ski yesturday and it felt absolutly amazing This ski
Seems like night or day sometimes it amazes me and other times it feels weak i guess ill just go with that the ski is perfectly fine lol

Guess ill work on other mods to the ski now

Are you married? Because if I had to guess, the ski works awesome all the time, but you only get to bring your balls sometimes. That is a common cause of performance inconsistencies. It's okay. We're all friends here and we've been there too.