I'm not familiar with the ACCS system at all. If it is what they call the simple carb venting to airbox system that was on my Polaris 600, then it doesn't change things enough to cause big problems if it isn't hooked up right. On the other hand, if it is a full system like the aftermarket Holzman product, it could have a profound effect on your jetting and fuel consumption.
I didn't know Polaris put stock carb compensation on their sleds like Ski Doo did, but that doesn't mean it's not a possibility. I'm guessing the acronym stands for something like Altitude and Climate Compensation System, which means it can change your jetting the equivalent of MANY jet sizes.
The way these systems work is that you jet the sled as rich as it could ever need. I think they jet them for -40 degrees at sea level or something like that. The system then pressurizes the float bowl according to the air density in the airbox. Less dense air in the airbox due to warm temperatures or high elevation causes less pressure in the float bowl and therefore leaner jetting.
If this system isn't working, you could be jetted for -40F at sea level which will never work in Idaho. I'm not sure what kind of components make up this system, but I'm assuming it's a bit more complicated than a few vacuum hoses. If this is a stock Polaris system, replacement parts may be difficult to find for a 1999 sled. Maybe not.
If this was my sled, I'd probably take off the ACCS and tune the carbs just by jetting. First, I'd read plugs and piston wash to see if the jetting was off. Then I'd take apart the carbs and compare the jets to what the jetting chart says you should have. If the jets are bigger than you're supposed to have for your elevation, you can assume that ACCS is a carb compensation system. If your motor is running rich, you can assume the ACCS isn't working. That's the point that I'd take off the ACCS parts, plug the holes, and put the right jets in and see how it runs. If it runs awesome, just run it like that, or determine which ACCS parts are faulty and attempt to replace them.
Otherwise, just try routing the hoses as shown in the parts diagram. I'd work with the assumption that a 1/4" difference in hose length isn't going to make a significant difference. A couple feet might.
First order of business is to read plugs and wash to see where you stand.
Last edited by Rubi : 12-22-2014 at 11:03 PM.