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durabaak 12-22-2014 09:51 AM

Now an ACCS question...
After changing reeds and fixing fuel leaks etc., on my 99 600 RMK, I read up on the ACCS and from looking at the polaris diagram on vintage snow the ACCS is routed all wrong. It shows a vacuum hose from the bottom of the ACCS on the air box routed directly to the vacuum outlet on the inside of the inside carb. The other line from the ACCS on the top is T'd in two locations and then to each carb's vent outlets. Mine wasn't put together anywhere close to this routing. The questions are; to reroute it correctly with new vacuum lines is there a specific length? I mean if the lengths are wrong by say 1/4 inch, is that a major issue? And other question is would this have helped to cause the excessive fuel use? Thanks in advance for the help you all. I really appreciate the feed back.

Rubi 12-22-2014 10:00 PM

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.

durabaak 12-23-2014 05:52 AM

Rubi...Thanks you so much for the detailed explanation! At over 400+ dollars for an OEM replacement ACCS unit, I won't be keeping this system if it is faulty. I am
going to replace the hoses today and then read the plugs. If they look right, I'll go run it and see how the mileage and throttle responses at altitude. All of the areas I run in are between 4500 and 6500 ASL so I'm sure a jet change, if necessary, will take care of a rich/lean problem if there is one. Thanks so much again for taking the time to write such a detailed and informative reply. It's always a good thing when I learn something! :)

durabaak 12-25-2014 04:50 PM

BTW.. That replacment ACCS was 289 on a few web sites.. Lol

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