I have a 97 Polaris SP Ltd (with the evolved chassis and 38mm carbs) - with a little work we managed to get a set of SLP pipes(I think they were the xcr/xc #09-5979) in there - I was told by the company they never made a set specifically for the evolved chassis because they did not like the set up of the chassis. Originally we totally screwed up the jetting and blew the motor - SLP said to increase the jetting 3 sizes over stock, We did that, worked well, no major problems for over 1000 miles ( the plugs have been looking from burnt marshmallowy to dark and oily and compression is 124 across the board). The only thing that has been happening was that if it is around -5 degrees centigrade or warmer or if I go through a deep snow I would bog right out, (not stuck but just bog down). I am thinking that maybe I should decrease the jetting by one size? Should anything else on the carbs be changed? It also goes through a ton of gas, max I would get about 65 miles to a tank. max temperature we would ever ride is -30 degrees centigrade and we are at 0-3000ft. Someone also said to go one size up in plugs so if it were BR9's go BR10's? Any suggestions? Thanks.

I would suspect the bogging may be clutch related, the cause being a poor backshift. What are you running for clutching now? Also a gear change would be recomended, at least to 20/39 from the stock 21/39. You should not need to run the needles any richer than the stock position, #3, and run the air screws at 1.5 turns out to start with. Make sure the carb ventlines are connected to the airbox, and it would be a good idea to gut the airbox, at least remove the foam inside. You only need to run BR9ES or RN2C plugs. With the pipes if you want to jet for safety at -30C, you will need to change the jets for -10C and warmer, or it will not run properly. Triple pipes on these engines require jet changes, you cannot get away from it, unless you install a tempaflow, or a ATACC. Also have the needle valves checked, and if needed changed to the newer viton tip ones, and the float heights verified.

Thanks Pockets

I did have new viton tip needle and seats installed at the beginning of the season. Sounds like the first step will be to add a Tempa flow system, just checked out their web site and it sounds good.

The clutch weights and springs have been changed at when the pipes were installed - so hopefully that will be fine. Not sure what you mean by back shift?

Now when I install the Tempa flow should I leave the jetting at 3 over stock or increase it one size? Who knows what the right jetting would be for that sled at
-30, SLP originally said 3 over should be fine, but maybe I should increase it one, but I guess I can play with that when the season starts.

make sure the tips of your pipes don't hang below your bellypan causing them to fill with snow. I have seen this on two sets of AAEAN pipes.

By backshift I mean the secondary clutch downshifting for the increased load of the deeper snow. You should be running 88-9000 rpm at wide open, and have 10MW weights. You secondary clutch should have a hot seat white, or SLP black ideally. The stock polaris red is a bit light for the best backshift with pipes. If oyu have ran down to -30C with no problems now, there will be no need to richen the jetting with the tempaflow.

Yeah I checked they don't hang below, thanks