98 rmk trail starting question

[mtnbound]

I bought this sled for my daughter 2 years ago and the thing floods real easy while on the trailer and is a PITA to start. So to put an end to this I shut the fuel off before loading the sled. Now last year while up riding twards the end of the season we had problems starting the sled at higher elevations @ 5000'. It has a 35 pilot jets and 270 mains. It also has the Polaris ACCS (Altitude Compensating Carburetor System) That I know nothing about. Is it possible that could be the problem. or is the pilot jet too big?

Thanks for any help

John

 

[treemagnet03]

had the 97 version of this sled and I have to say that the description you give was only solved by selling the sled. 12-13 pulls on average to start. Gas would blow out the pipe after being pulled 20 or so times following rolls on the hill. We tried leaning it out a bit, played with the idle, checked the motor top to bottom, and gave up on the electrical system after spark seemed fine. Hope someone else on here has some answers...I would love to know what was up with that thing...it was a fun starter sled otherwise....

 

[sled_guy]

Well there are lots of things that could cause it...

Default mode for the ACCS is full rich. So if it fails, and you are up at higher elevation, it will be rich.

The problem could readily be bad needle/seat, especially if shutting the fuel off keeps the problem from happening.

And finally, low compression can cause the same problem.

I'd start by having someone go through the carbs and make sure they are in good shape and clean and such. I'd also have them throw a compression gauge on it to make sure you don't have a compression issue. If both of those things check out then the ACCS is probably the likely cause.

sled_guy

 

[turbolq4]

had the 97 version of this sled and I have to say that the description you give was only solved by selling the sled. 12-13 pulls on average to start. Gas would blow out the pipe after being pulled 20 or so times following rolls on the hill. We tried leaning it out a bit, played with the idle, checked the motor top to bottom, and gave up on the electrical system after spark seemed fine. Hope someone else on here has some answers...I would love to know what was up with that thing...it was a fun starter sled otherwise....

i have had the same experience, and i too like these little sleds. The solution that worked the best for us was taking the 10mm bolts out of the crank case to drain all of the gas out of there, put the bolts back in and it would fire up after about 5 pulls

 

[mtnbound]

Well there are lots of things that could cause it...

Default mode for the ACCS is full rich. So if it fails, and you are up at higher elevation, it will be rich.

The problem could readily be bad needle/seat, especially if shutting the fuel off keeps the problem from happening.

And finally, low compression can cause the same problem.

I'd start by having someone go through the carbs and make sure they are in good shape and clean and such. I'd also have them throw a compression gauge on it to make sure you don't have a compression issue. If both of those things check out then the ACCS is probably the likely cause.

sled_guy

thanks for the info I will deffinately take it to my mecch and have him check those items out

 

[dvst8r]

Check float height, and make sure the floats still float and don't have any holes in them. Quick way to test needle and seat is, drain the carb turn it upside down, blow into the fuel inlet pipe for the carb. If you can blow any air in, they are leaking.