Superjet has no lowend power

[BlueBreadTruck]

Thanks!

Like I said though, the engine is still makeing a gurgling at low/mid rpms and vibrates...it isnt smooth...it "cleans" out at wot though...even though it isnt all that fast.

ok, as of right now, the Hooker impeller is a 9/15
The ocean pro steering nozzle has the divider, and is longer
I will see if i can get the headpipe screws to move...maby that is my problem? too much water?

I did NOT measure the headpipe or manifold.. I will take it apart and see

 

[PitStop504]

Any new developments? Not to hijack the thread, but I'm having similar problems with my 95 Superjet, in addition to hard starting. Rather than start a new thread I figured maybe I could revive this one so as to not recreate the wheel...

I've got the old-school Factory Pipe with only top and middle adjusters. Mid adjuster is seized closed. I put a screw in to close off the bottom (per a phone conversation I had with Factory Pipe). The top was also seized so I had to drill and tap it. Accidentally drilled a little to far and opened up the hole on the inside a little bit, but I can get the pipe to sizzle so I don't think I'm getting too much water. Runs strong on top.

In addition to the lack of low-end throttle response, the ski is tough to start in the water. I have to get off and tilt it so the exhaust exit is out of the water and work the throttle. I can't get a consistent idle out if it, either.

I've got a 1.5 n/s and a 95 gram spring which yeilds a pop off of around 42. 120 pilot and 145 main (which is what Factory recommends on their site - too rich?). I tried going 2 turns out on the low speed but it just will not start. Best starting and idling are around 1/4-1/2 turns out (which I know seems really lean).

I think part of my problem could be the k&n oval filter with the metal lid missing - just has a nylon pre-charger sock over it. I just got the ski and have been working out all the bugs. A stock flame arrestor is on the way.

Could the prop be causing any of the hard starting and idling problems? I only ask because it starts fine on the hose and I have to turn the idle adjuster a full turn down to keep it from screaming RPMs on the hose. It has a Solas YB-SC-A, which I was told by solas is a discontinued 12-17 pitch. Maybe too much prop for low speeds?