My SKS 700 seems to cut out when I have it full throttle. It only has 480 miles. Does anyone have any suggestions? The dealer says it's jetted for the area I ride in. Please help!

Check that the main jet hasn't fallen out of the needle. Does it do it right away, or does it need to be warm? Did it just start doing it, or when did you notice it. Give us some info.

It does it either cold or warm, but mainly under a load i.e. climbing. The dealer gave me some Polaris carb cleaner that they said I should run through my tank, but I have not done that yet because I haven't been out since then. It started last year toward the end of the season. I was thinking that maybe the higher air temps had an influence on it, but I was wrong because it does it in all types of air temps. I have changed the plugs (the old ones looked good, marshmellow brown color), but that did not help. Thanks for the reply. I will keep troubleshooting.

Hmmmm
TPS switch maybe??
When you say cut out....meaning stalls.....bogs.....coughs....
Just like Pockets said, give us as much detail as you can, and we will try and help you out..


BigDog Racing

It cuts out/sputters at around 6700 RPM. It is like a cough if you will. The engine does not die. It'll keep going. I am not well versed with jetting or clutching or anything like that. Any help/info is greatly appreciated. I will be out next weekend with it and hope to be able to troubleshoot it some more and bring back more information (more precise) as to how it's acting/sounding. Thanks everyone for the replies....

Wel Pockets and Nickels have much more experience than most of us...but I would start with the carbs....I doubt you have a cracked reed at 480 miles.

I know its hard to nail it down, but we will try and point you in the right direction.
I know the 04 RMK 151'' would not turn up past 7000 rpm if they were on a stand, there was some kind of load sensing built into the electronics that would make it stutter at 7000 rpm when under no load, we tried for days changing cdi's/carbs/reeds etc, until we discovered this and verified with Polaris.

Did the SKS have this Kerry/Jon????

Take it off the stand it would churn 8100 all day long.

BigDog Racing

Does it have the updated CDI?
The stock/original one enters into lame mode at a far too low water temp which could be what your prob is.....confirm with a dealer with your ser# that it is done.

Cracked or broken reed?

TPS voltage could be off?

Mice in the airbox...don't laugh...I once chased a similar demon for a month finally finding a completely occupied airbox with 2 dead mice and a ton of insulation and chewed up foam pluggin it up!!!!!!!!!

Defective stator? Not normal in quite a few yrs but possible....the early XCbig blocks had this problem.

Post very detailed prob symptoms/conditions
We/you will get er dialed in!

Terez

BTW...Get that CDI of yours updated, it needs it.
There was a recall same as your Pro-X

Hey All

Thanks for the replies. I checked the CDI box, looks like it is the updated version. Service Bulliten is S103-09 w/ a date of 2/26/03. PN is 4010958-R. I took off the air box and no mice!! I took the VES valve off and took a peak at those, they looked pretty clean. Like I said in my other reply, I guess I will have to get it out this weekend and check it out again. BTW, what is TPS stand for and how do I adjust that? I believe it has something to do with volts? Right? Thanks all. More to come.....

Most of the new engines will not rev out under a low load condition. They do not burn the fuel properly. I was going to say a VES problem, as it is close to the valve opening rpm, around 7000 rpm. I would check the ves again, clean the passages, and check for a leaking bellows. Take the main jets out, and be sure they are not blocked, and see what size they are. Use only RN57YCC plugs, and check the plug caps to be sure they are threaded onto the wires all the way, and they snap on the plugs tightly. Also that the wires are threaded into the coil all the way.

Forgot to ad, when you take the carb drains off, catch all the fuel, and put it in a container to see if there is any water in it. If there is a large amount drain the tank, put a fresh tank of fuel in, and a 1/2 liter of isopropyl alcohol. Also remove the fuel pump, and have it cleaned out. Moisture in the pump will restrict the fuel flow.

I put new plugs in and the dealer recommended NGK BPR9ES. It is what it has always had in it. Are they a bad choice for plugs?

HUTCH...throw the NGK in the trash and get the Champions RN57YCC , big no no runnng those NGK's the Poo's just don't like them,don't know if that wil help but its a start.
Do Pockets recommendations first, we don't want to give you too much at first.
Do you know how to check the VES valves to make sure they are not leaking??

BigDog Racing

10-4 ...........I had the CDI updated before I picked er up.

The TPS is the Throttle Position Switch.
It is located on the side of the mag side carb body, it is a small black plastic fitting that is plugged into the wiring harness.
It senses the throttle position and this info is relayed to the CDI to make ignition curve adjustments.
The setting of this is critical. I am not totally familiar with calibrating or testing the unit. It needs to be something on the order of 3.75 volts.
Get someone who knows how and or has the right tools or see the dealer.
They are usually ok and come set from the factory but every once and a while you get one that is wonky or poorly set.

I will get some new plugs tomorrow and throw them in! I always thought NGK was a good plug! Oh well!
I do not know how to test to make sure the VES valves are leaking. I would guess that I would start her up and feel around for airflow or use some soapy water to see if there are bubbles?? Thanks again all! Like I said, hopefully this weekend I will get to fiddle around with it!

the NGK BPR9ES plugs will work fine in the sled. just make sure they are not BR9ES plugs. the difference is the added reach on the BPR's. the standard BR's leave the spark gap in the threaded hole on the head and don't exactly promote a good flame pattern. also check your throttle flipper play. there is a safety system in the throttle block designed to shut-down the motor with stuck throttle with no pressure on the flipper. they are usually loose from the factory. i know some guys that use the palm of their hand more than their thumb, they ended up disconnecting the system to avoid recurring problems. the suggestions the other guys gave you are most likely the source of the problem, but i thought i would throw this out as something else to check.

Check the clear breather tubes that connect to the air box to make shure that they are not pinched or broken.

Thanks Butler. Clear tubes not pinched! Last night I drained the carbs to make sure there was no water. I believe there was a little water in the reddish colored tubes. All gone now. Also cleaned the fuel pump out. I am off tomorrow to find some powder! Hopefully she'll be a runner! Going out w/ a couple friends with new sleds. They want to run that first tank of gas mixed w/ oil for break in. One guy has the new 800 Summit and the other the new 900 Switchback w/ 2" paddle!

Does anyone run the ignition switch on premium on the '03 SKS? If so, what octane of fuel are you using? I can only get 90 from the pump. Does anyone run any octane boost? Thanks all!

P.S. Attached is a pic of me on our '03 Ski Doo Summit. Wife bought it while I was in Iraq!!

Hutch

Yeah........Definitely run the ignition in the premium mode as long as you are using 91 or better octane fuel.
There is a noticeable difference in power as the ignition curve is hotter.

Use the regular position when you can only get reg and or you feel you may be on the lean side...Really cold/bad or watery gas....that kind of thing.

Hello All

Well I went for a short ride today near the Willow side of Hatcher's Pass. Not much snow to have a lot of fun, but a good time to break in a couple of my friends new sleds. Anyway, after tinkering around with the sled before going out it still cut out/dogged out around 6500 RPM. My buddy tested it out and said it was my jets. I had a set of 440's in it and he took them down to 430's. What a WORLD of difference! It's fixed and now I know how to do it!! Cool. At around 1500-2200 feet in elevation it ran fine, but when I was 2300-3400 it was sputtering bad/loading up.....the different jets fixed it all.
Oh, my buddy was rding his new (900 '06 Switchback/2" paddle) and he ran it into a huge rock and bent the lower front driver's side A-arm (correct term). That is the only bad thing that happened....need deeper snow! Thanks all!

Hutch

Install a Tempaflow or ATAAC on your sled and jetting woes will go away. Another thing to watch out for is a faulty temp sensor which was not common recently but can happen. OUCH for your buddy, first rides around rocks are notorious for taking out t&a arms.

Go down to 420 mains.
Runs great @ sea level and is safe.

Lot's of us running 420 mains @ sea level in stupid Cold with no probs.
For me, over 8000 miles in 2 yrs @ sea level in very cold with no probs.
03 PROX7

Post or PM me your experience/reports on your SKS if you would.

Just bought an 03 SKS 700 new noncurrent, hasn't seen snow yet.

Thanks

:div20: :div20:

Once again, thanks everyone. Terez, I will keep you posted with any occurances on the SKS. I went and bought a set of 420 mains today. Next time I am out, I will see how they work.

Hutch

My dads 04' 700 switchback was cutting out but wouldn't quit running and pop a bit then run ok again (did it more often and more prolonged) and kept taking it back to the dealer. After shortening the pulse hose to the fuel pump(1st trip) then putting on a new temp sensor(2nd trip) then a TPS check and bought a CDI Box out of pocket (3rd trip) Then took it to another dealer who fixed a bad wire going to the stator (No more trips!!) Sounds like the same deal.......