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96 580 powder special problems

N
Jan 3, 2008
733
311
63
34
Northern Utah
This sled used to rip for what it was. Would smoke my 700 mtn cat in a powder climb. It was my buddies who has passed away and I ended up with it. The sled is carbed and is running psi pipes. On the flats down in the valley it hits 7500 max rpms. Where do these motors want to run at? this seems low I was thinking 8200ish. Now when I go up in the foothills the sled runs horrible. Pulls a hill around 6000grand. Before my buddy died this sled ran amazing. I have changed nothing since I got it. I had the sled in higher elevations in a meadow and when I would give it gas it would let the clutches engage then just die. As I started to ride lower in elevation it ran better. Allt comp gone bad? Any idea where to start with this B? Would really like to get it going for a second sled for people to ride.
 

sdsnocop

Well-known member
Premium Member
Feb 3, 2009
1,440
2,191
113
Hot Springs, SD
Sled should run at 8000-8200 with a stock pipe (I do not know if different with performance pipe). With altitude compensator my 97 PS runs a 380 main. The compensator is designed to fail at a rich setting so check the plug color. A black oily color indicates a rich condition. I am not sure the jetting required for that sled with the compensator disconected but if it was my sled I would start with 250-260 mains at 5000-6000 feet and check plug color. If youir plug color is good (light to medium brown) I would concentrate on clutch problems.
 

m8magicandmystery

Well-known member
Lifetime Membership
Jan 20, 2008
7,786
3,724
113
Yukon
your not kidding those sleds ripped...!!!!...black magic and psi got them sleds wicked performance...and climb with the plastic paddles in those days...man alive your post brought back memories...!!!!
 
N
Jan 3, 2008
733
311
63
34
Northern Utah
Running 410 mains. In the valley its at 4600 ft and I ride up to 10000. Think I should just can the altitude compensator and start at 250? Or keep it and still jet down and see what happens
 
N
Jan 3, 2008
733
311
63
34
Northern Utah
Sled has sat for 5 years..wow. anyways my nephew wants to ride it so we started jetting it. So far wide open it rips with 270 mains. The bottom end is a dog. Its at a 75 pilot and wants more. I think something is wrong with these carbs or a possible boot leak. Anyone have an idea?
 
A
Jan 23, 2015
1
0
1
54
I'm riding a '96 PS with the altitude comp removed. My carbs are the same as the '95 (no alt. comp.) so I used the numbers from that set up. Currently running 310 mains and I'm still a bit rich (no snow down low this season so my rides have been 4000 to 6000 feet). Clutch should come in 3500 to 3800 RPM stock and should top out just above 8000.

I have the '95 book at home and could scan the carb setup page if it would help.

Gary
 
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