PSI pipes on a '98 Ski-Doo

[scaaatter]

Helping my old man revive his old '98 Ski-Doo Freestyle 500F and he scored a full set of PSI triples with stingers. Basically the problem now is there seems to be no info online about base jetting for these. Have you guys tried PSI pipes back in the day and remember where to start? Step-by-step please in simplest terms

 

[Doodle.tom]

I'd start around 320 mains, 40 pilots, and needle in the middle clip, air screws 1 to 1.5 turns out but that's just a ballpark though, do a plug chop and keep an eye on the temperatures

 

[icedustnomad761]

I remember a few years back when I ran some PSI triples on my buddy's sled. We kicked things off with 370 mains, 17.5 pilots, and had the needle set right in the middle clip as our starting point.

You know the drill, warm it up, go WOT, then kill it and check those plugs. You're aiming for that sweet spot, the insulator should be a light brown, and the electrode tip should have a nice silver shine. From there, just tweak the mains one size at a time until you get it just right.

By the way, what elevation are you riding at? That info can really help you nail it down quicker. Enjoy the ride!

 

[insanefandomkid]

I remember a few years back when I ran some PSI triples on my buddy's sled. We kicked things off with 370 mains, 17.5 pilots, and had the needle set right in the middle clip as our starting point.

You know the drill, warm it up, go WOT, then kill it and check those plugs. You're aiming for that sweet spot, the insulator should be a light brown, and the electrode tip should have a nice silver shine. From there, just tweak the mains one size at a time until you get it just right.

By the way, what elevation are you riding at? That info can really help you nail it down quicker. Enjoy the ride!

Thanks for the tips! did you notice any big differences in performance between clip positions or when changing temps?

 

[lalalalala]

Thanks for the tips! did you notice any big differences in performance between clip positions or when changing temps?

Not @icedustnomad761 here but I also have the same experience. For me, yeah, moving the clip definitely changes the midrange feel, and colder temps can make it run leaner. So you may need to bump up the mains a bit in winter. I mean you still got a long time till then.