RK Tek Post

[Old Scud-doo]

That was the exact description my dealer said was the kill switch/throttle saftey switch harness problem. He had 1 come in like that last week and Polaris told him to change the harness/switch assembly. The problem went away I was told.

Funny! I just saw where you're from. That was my sled that was in the shop. If there is a problem with anything I seem to be the guy that it will happen to. I tell people if you want to buy something, bring me along. Find out which one I pick and then turn and run as fast as you can! Seriously though I do believe Brent and Sports City did fix the problem. It didn't seem to do it when I blipped around the parking lot and then loaded the sled.

 

[wellfed777]

good info guys
old scud let us know if its fix when you ride next
thanks

just remembered not sure it applies but there was a thread about
wires near the stem/bars rubbing bare ?
might check your wires everybody

 

[bcjasonj]

My sled doing the same thing..bogs around 5-6K but not all the time? I have over 12hrs on mine, running non ethanol plug and good 91 -94 octane fuel. Took it to my dealer and he told me it was my lefty throttle hanging up!! Strange as I know the diff between something stopping my throttle thumb vs my thumb going to the bar smoothly and engine stumbling. After arguing this my 1/2 hr diagnosis was written off and was told to continue to monitor it. They hooked up to cpu an no codes or anything so as far as they're concerned there is not a problem!! Not sure what to do now... I even changed my plugs after first tank of mixed fuel thinking it may have been plugs fouling from excessive oil at breakin.

 

[Old Scud-doo]

good info guys
old scud let us know if its fix when you ride next
thanks

just remembered not sure it applies but there was a thread about
wires near the stem/bars rubbing bare ?
might check your wires everybody

I will do that. I don't plan on riding until the day after Christmas so it will be a few days. I actually saw that post and had my dealer put loom around those wires when they were replacing the switch and wiring.

I know I kept checking plugs, plug wires, and all wiring connections when my sled was acting up. It really feels like you are dropping a cylinder when it happens.

 

[800poodragon]

Funny! I just saw where you're from. That was my sled that was in the shop. If there is a problem with anything I seem to be the guy that it will happen to. I tell people if you want to buy something, bring me along. Find out which one I pick and then turn and run as fast as you can! Seriously though I do believe Brent and Sports City did fix the problem. It didn't seem to do it when I blipped around the parking lot and then loaded the sled.

Yep, they said Polaris told them right away what to change like they know about a problem there. We looked at seeing if we could eliminate or bypass the throttle saftey switch but they use 2 resistors there to get a different valeu weather the switch is open or closed. Not just open or shorted.

 

[Peevo]

I had some problems between 5000-5500 rpms. I think it was the clutch, but it felt a little like it was bogging. It all disappeared after some hours.

Sad for you that have bigger issues than mine.

 

[RMKRAZIE]

I experienced the wire issue first hand, had to wrap them up with some tape and tie them up better, My Dads sled is the regular rmk (non PRO) I recommend that everyone looks at the wires, It would shut the head light off about when the bar was turned half way to the left and right but would go away at full turn or straight. But as far as the bog goes I have put 100 or so miles on it 5.2 hours or so on it to break it in (i have it tough ) absolutely no bog at all runs perfect fingers crossed it stays that way.

 

[Old Scud-doo]

good info guys
old scud let us know if its fix when you ride next
thanks

just remembered not sure it applies but there was a thread about
wires near the stem/bars rubbing bare ?
might check your wires everybody

Well my problem is not fixed. I am starting to get a little pi$$y to say the least. I have two expensive trips planned next month and I am getting tired of games. I sure hope they will atleast take it up to the hill to test it this time.

To review what my problem is....when accelerating or under full throttle the sled runs fine. Go down the trail or in the trees or any freaking place that you lightly back off the throttle and the sled almost stalls. I let me father ride my sled today and I rode his for a few minutes just so I had another person have it happen to them. He said it feels like the fuel is getting shut off. I can't be spark to one cylinder because both plugs fire at the same time. I appreciate any input or suggestions.

 

[wellfed777]

sorry dude totaly sucks when they wont run right

have you checked for dead spots on the tps ?

i was trying to think about everything that plays a part when backing out of throttle
tps,throttle safety switch,ecu, engine movment (rocking on and off power)

does it do it when the throttle is in a certain position ?
you might try figuring out testing different on off throttle situations all the info you can gather then brain storm with the mechanic and get him thinking how, why, what
good luck

 

[Murph]

The RKT post is here--in a new and improved version--

http://www.snowestonline.com/forum/showthread.php?t=245062

Sorry to hear that some are having problems. We have two Pro RMK's and they are both running great, no driveability problems.

No bogs, no stumbles, no hiccups.

Fingers crossed they both continue to be trouble free.

Oh yea, mine is at 628 miles, girlfriends is around 300 miles.

 

[Old Scud-doo]

I am don't know what it is. I know the motor isn't rocking since it's not like completely letting off the throttle. Just barely backing off and on the throttle will cause the symptoms. Taking the sled in this morning and dropping it off. See what they come up with.

Dad's Pro has zero problems so I know it's probably an isolated problem...I hope.

 

[crf118r]

Yep, they said Polaris told them right away what to change like they know about a problem there. We looked at seeing if we could eliminate or bypass the throttle saftey switch but they use 2 resistors there to get a different valeu weather the switch is open or closed. Not just open or shorted.

Un-tape it and remove the push-pin with the metal connect portion on it and tape it back up. This will "remove" your throttle safety switch and allow the proper impedance value sent to the ECM. I had to do this to swap throttle blocks and delete the kill switch to add a tether.

 

[AndrettiDog]

So...are people with the bog issue at a lower elevation? I'm just curious because mine runs great. I really hope I don't see any issues (don't we all?), but I like to get as much info as possible. The guys down low would be running a little leaner than me (9k-11k).

 

[Old Scud-doo]

SWEET!!! Dealer called and said they believe the problem I am having is an injector problem and two new injectors are being shipped today. Overnight freight at my expense but I have to thank my dealer for being willing to get it done and back to me before the weekend.

 

[mountainhorse]

I've heard that from 2 different sources besides you... In all 3 cases... Polaris Factory Tech/Warranty is telling the dealer to replace the injectors.

Would you be willing to try cleaning the spark plug boots and re-gapping the spark plugs BEFORE pulling the sled apart to do the injectors?

It costs Zero $$ and can be done in a few minutes. If this fixes your problem... you will not be on the hook for the VDO express charges.

Polaris has had some problems with intermittent injectors.. they have authorized the dealers to change out injectors..

This would help other sledders too who might find themselves in the same situation.
....
OR.. you can do what we did to fix our problems...

1) Blow out the spark plug cap with air and make sure that they are on tight to the coil wire.. and to the top of your plug... There is resistive build up in the gap and the spark energy is getting redirected to this resistive build up and causing a mis-fire..

2) Re-gap the plugs to .018".

3) Make sure your (spark plug) cap is not loose (when you push it down onto the spark plug)

Try this.. and see if your problems disappear...

IT COSTS NOTHING TO TRY!!!

This is NOT a deto problem or a limp mode problem.. the ECU will store all fault codes.. Ours had none and neither have many others...

NOT all sleds are plagued with this issue.. but MANY are!!!


Kelsey

 

[Old Scud-doo]

Mountainhorse: My problem is not the bog or cutting out that others are more commonly experiencing. I've talked to a number of Polaris service people and we all agree that it's not a bog or a miss fire that seems to be a pretty common problem. I am going to personally check my plugs and have them regapped so I don't have that problem. I am being told that the injector is not closing at low rpm and or low load which is causing a flooding of that cylinder. It sounds and feels like a jake brake is being applied. Maybe not but I am willing to try it since Kurt at Kurt's Polaris and Brent at Sports City all believe it's an injector.

 

[Johnny]

Service manager at my dealer also said today that he was told by polaris to replace injectors if he has a sled come in with the above symptoms. Said that polaris suspects that there may have been a bad batch of injectors.

 

[rmk727]

To be specific our trouble is; when you mash the throttle the sled will take off then suddenly quit ( as if the spark has stopped ), then take off again. The severityof it is so far a broken consol by a knee. We just did the plug blow out and regap and checked all connections and it did not change anything.Next is a new kill switch, will advise on that.

 

[800poodragon]

I have the same dealer as Old Scud-doo as well. I did give them a hard copy of Kelseys work around that they tried on my sled as it was something easy for them to try. It did not make any difference on my sled tho it very well may on others. Appreciated Kelseys idea. I will try it again myself if the injector idea does not pan out. They have been great on having a mechanic work on it all day trying everything they could. They switched the kill start harness, changed plugs, Changed the spark plug boots, changed ethanol chip, tested fuel pressure and I do not know what all else. They are putting new injectors in mine as well per Polaris directive. My problem was a little different than Old Scud-Doo's as his happened at lower rpm,s and mine is at wide open throttle it would pull hard than seem like you would lift off the throttle and then pin it again...even tho you never lifted off the throttle. We shall see what it does...

 

[ENDO1]

I've heard that from 2 different sources besides you... In all 3 cases... Polaris Factory Tech/Warranty is telling the dealer to replace the injectors.

Would you be willing to try cleaning the spark plug boots and re-gapping the spark plugs BEFORE pulling the sled apart to do the injectors?

It costs Zero $$ and can be done in a few minutes. If this fixes your problem... you will not be on the hook for the VDO express charges.

I have a set of Iridium plugs that I am going to try, do you think I should change the gap on them to ? I had the bog for the first time last week only did it once as I started up the hill than recovered and could not make it do it again,
have over 300 miles on sled.