Durnt

I have a Polaris sl1050 PWC that is completely stock except for motor. 2 years ago, the stock motor seized (i think due to oil system issue. This has since been removed and been running mixed gas).

The following year (last year) I bought a 1200 engine and put it in. The engine runs great at high speed (flat water 60+ MPH) but between idle and 1/2 throttle, the engine acts up. I believe the low speed carb was not properly set. Due to my need to fiddle, I foolishly changed the low speed settings without first checking what they were at.

Now the engine is a alright to start at first, but gets harder when it gets warmer. Also the it won't idle at all (pulsing the throttle trigger keeps it running). Also if I go 30ish-40ish MPH and let off completely for 1 second, then no matter what I do after that second, the motor dies.

Back to the point of the post, what is the stock low speed needle settings (for the 1200 engine since that is what I'm running)? How do I know if engine is running too rich/too lean? It was actually running reasonable before i fiddled, it was sluggish at lower speeds throttle transitions it but actually ran at consistent RPMs.

As a note: the 1050 model does not have a high speed carb adjustment. Also, are there any tuning tips for a triple carb? It is a pain to adjust while it is in the ski.

Ruffy

What I do is turn the low and high idle screw all the way in (count each rotation and remember it!). Then I turn both of them out 2 turns and go from there.
Another way is to have it running and turn the low idle screw in but listen to the exhaust. Once it starts to bog down stop and turn it forward 1/8th-1/4. Now for high idle screw. If it seems like your not getting enough RPM and bogs/lack of power then turn it out a 1/4 turn each time then test it again.

I posted on this site a week ago about a fuel rail and never got an answer back. So I hope this helps you out