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Yes there should be a little fitting with a screen clamped on that has a check valve inside of it to filter particulates and stop fuel from backflow for easy startup.

Update: Pulled the pickups out of the tank, everything looks good there, check valves are working on the pickups. So I pulled the mag cover.... And found rusty colored dust covering everything, and some water on the flywheel and in the bottom of the enclosure. I'm going to ohm everything out...

Yes but have tried 2 new sets... Needle and seat is working good also. I think that if it was an air leak in the fuel system pulling the choke slightly and richening the fuel screw would make an improvement on the way it runs. Runs best about 1-1.5 turns out either direction it suffers, and if I...

replaced parts and sprayed everything out

Did the coil seem to help the issue at all? Mine runs the same on deserve as it does "on" when I had the carb apart I pulled the needle out of the seat and hit the start button and it sprayed fuel everywhere like it should on both selectors. Seems to me the more i run it the worse it gets....

Ok guys, I recently rebuilt my 90 SP and this year when I fired it up its not running very good, spitting and sputtering. It has 147lbs of compression per side, I rebuilt the carb and if its running(barely) I can get it to rev up intermittently and if I grab the choke it dies right now so I know...

Awesome, thanks for the info. Sounds like a cheap easy fix for me!

Moving the steering doesn't change the condition. When I lean the low speed adjustment to get it to start without throttle it runs too lean under 1/3 throttle and my plugs turn white IE too lean. Crank them back out now there a nice golden brown but needs a little throttle to start it, after...

All of my old rotary valve sleds were the same, if you lean it out to the point where it starts without throttle the plugs start turning white when cruising low speed... Is the kill switch an open or closed loop on this? And is there an OHM reading I can test for?

Ok guys, I bought a 93 sp cheap. It runs great but starting it is kind of a pain when its warm. The way I start this thing is push the kill switch push start button(when its cold obviously pull the choke) then release the start button and it pops right off. When its warmed up its a bit of a pain...

I'm not 100% sure, i might ask my old man to drop off his radar gun to find out when i put it on the water tonight. Did anyone make a better exhaust for this thing? And does anyone know if the twin carb exhaust makes more power? I'm going to squish test it this weekend just to see what kind of...

Thanks for the info, maybe with a few extra hp it won't dog as much. Anyone bump the timing up and raise the rev limiter in the CDI box?

Seriously kid go troll another forum with your 20 year old ski. My sled would roost your ass on water. I asked a simple question and your being a d-bag.

Not sensitive at all, if I've read your opinion once and acknowledged it I don't need to hear it 3 more times. At that point you are a troll. I'm asking for performance options not whether or not I should. Dootalk is a snowmobile forum for all facets of skidoo snowmobiles, from mountain...

I said 70-75hp, the sled makes 110hp now your just taking things out of context. Been here 5mins it already feels like dootalk.com...

Because I port two strokes, and have a machinist that does my head cutting for me for $20. If I can get my hands on a twin carb setup I could have the hp in your ski for about $100 Keep in mind there are snobby people out there that would say the same to your 96....

What is wrong with engine upgrades as long as I add the required fuel to sustain it? Remember the snowmobile version of this engine puts out 110hp....

First of all Hi, I am new to the forum. Im looking for ways to improve performance on the 90 sp 587 I just picked up. its in near mint shape good compression, no chips or bends in the prop. I build performance 2 stroke snowmobile engines on the side. I know a lot about the engine as it is...