2014 600 RMK 144 Standard

[renegade18]

I have this over on HCS but no responses. I was thinking some people over here may have suggestions or ideas.

OK I bought my wife this sled as a left over about 3 weeks ago now. It has about 250 miles on it. I took it out and trail rode it for 40 miles with my buddy and then parked it. My wife and I then rode it a 120 miles off trail the following weekend. Everything was fine and the sled ran great all 3 times even in some really deep snow.

Then last weekend we trail rode it with our kids. We were doing 30 MPH max and did about 50 miles. Well when we were done I took it up a small hill and when I hit the throttle it fell on its face for a millisecond and came to life. The sled would also sputter at take off up to about 5K RPMs. My wife noticed the throttle had a ton of play (3/8th-1/2 inch). I thought this maybe tripping the throttle safety switch so I brought it to the dealer.

Of course the dealer could not re create the issue. They did fix the throttle cable but this weekend the sled did the same thing. The sputtering from 3800-5000 during take off is the bigger issue.

I took the sled out again this weekend and still the same symptoms. Sled did fall on its face again while my cousin was riding it. So I took the plugs out to check. Clutch side was nice and tan however the other side, mag side, was grayish almost white (obviously burning hotter). The sled runs fine on the trail and at higher RPMs. I also notice that the sled is over reving quite a bit upwards of 8500 RPMs in heavy wet snow.

Anyone have any ideas why a brand new 600 would be sputtering like this and falling on its face every once and a while.

Thanks

 

[rmscustom]

Did you change the plugs or just look at them?

 

[tdblakes]

did you verify you have the correct weights in for your elevation? Double check that the throttle cable is tight and pulls the flipper all the way closed when its sitting idle.

lose throttle cables can make the sled to some funky things...

 

[renegade18]

I did change the plugs it seemed to be a little worse once I put new ones in. The cable was tightened back up and I thought that would fix the issue but no can do.

As for the weights that is a good point. I figure if I bought here in NH it would be shipped with weights for flatlanders. My buddy I was riding with has a 13 and his ran 8200-8250. He bought it used so I will have him ask the guy he bought it from if he changed the weights.

 

[tdblakes]

The factory doesn't care where its shipping. The dealership or new owner is responsible to get the correct weights installed. Every RMK I have purchased brand new has come setup for 6k-8k feet and I buy the sled in Wisconsin.

Does it make a difference if you rev it up slowly vs punch it?

 

[renegade18]

It only sputters when you are applying the gas slowly to take off or going slow while turning. When you punch it that is when it fell on its face the 2 times it did. But even then it was not punched from a stand still. I was moving when I punched it, although slowly, and it fell flat to the point where I almost fell off.

 

[xj1978]

Check your weights to make sure it is set up for your elevation.


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[Reg2view]

Could easily be the rev limiter, that's how they act if you're too light, tho the dealer should have looked at the clutching unless you told him not to consider it. Blakes is right - clutching is purely your responsibility to confirm, all come from the factory with 6-8 setup. There is even a card they put on the bars when the sled is new warning the new buyer of this.

 

[Jkmola]

Blakes is right - clutching is purely your responsibility to confirm, all come from the factory with 6-8 setup. There is even a card they put on the bars when the sled is new warning the new buyer of this.

So having a bought a used sled, how would you confirm this? I'm getting ready to install a Gabes clutch kit, and since I'm in there, I'd like to check.

 

[Reg2view]

So having a bought a used sled, how would you confirm this? I'm getting ready to install a Gabes clutch kit, and since I'm in there, I'd like to check.

Pull out a weight while you're putting in the kit. Confirm the primary spring color, and if it's been used, I'd put a new primary spring in regardless with a new clutch kit, if the kit doesn't have a new spring, even if it's the same spring rate, just so I know, and to get the most out of the kit. New springs, new belt. Don't know what sled, mods, or elevation, the Gabe's I've seen uses stock weights. OEM the RMKs are set for 6-8000, 600's get 10-58's, black/green primary spring, 800's get 10-62's, 140/330 primary spring. Owners manual has a chart for stock sleds, if you have it.

 

[renegade18]

Yup I should have consider the weights but I just noticed it over revving this past ride. It is listed as you said and the rev limiter may be the culprit. I did notice when it did over rev off trail, then I slowed down to a stop, and applied the gas slowly to take off it would be worse than just riding at trail speeds 45-60 MPH.

Thanks for all the info and please keep the suggestions coming.

 

[retiredpop]

Rev limiter shouldn't come into play at 3800 to 5000 rpm. The greyish plug tells me there is something wrong with the injector on that side. Spec on operating rpm is 8250 plus or minus 250 so you are within specs.

 

[tdblakes]

I would think that incorrect weights throw off your fueling table and could cause stumbles and lean conditions as the table is built off the RPM and TPS. For example 25% throttle gets you 4500rpm but if your weights are too light then 25% throttle could get you 5000rpm which may be the wrong amount of fuel for the conditions you're operating in... Is that logic correct?

 

[renegade18]

My buddy also took a video of my cousin going through a small drift at WOT and you could her it misfiring. He said while videoing yup sounds like she is misfiring.

I thought of the injectors too but wouldn't it shoot a code or cause the check engine light to come on?

 

[tdblakes]

2 years ago my assault started acting strangely just out of the blue. Sometimes it would rip and sometimes it would fall on its face. It happened anywhere in the RPM range and seemed random. Took it to my dealer and couldn't recreate the issue but it was under warranty so I left it there until they found the issue. Turned out I had a broken injector wire inside a casing because when the harness was moved to a certain location it would cut out. New harness, no problems since. Maybe you have an issue like that...? Good to check thru the easy stuff first tho

 

[retiredpop]

My buddy also took a video of my cousin going through a small drift at WOT and you could her it misfiring. He said while videoing yup sounds like she is misfiring.

I thought of the injectors too but wouldn't it shoot a code or cause the check engine light to come on?

I'm thinking it would not give a code if it was not delivering the proper amount of fuel because the electronics probably just monitor the request for fuel. I could easily be wrong though. I know it is pretty old school but that plug color would worry me a lot. How much trouble is it to change a fuel injector and would the dealer do that as a trouble shooting aid especially considering the sled is almost new?

 

[renegade18]

I am not sure I new to this dealer because my old dealer no longer sells new sleds.

 

[550iq]

Just to cover the bases, take a good look at the power valves. When you do, you can also get a look at the exhaust side of the pistons. If all is well, you can cross them off the culprit list. 550iq