09' won't hold rpm's

[wpeak]

I also have new hi torque rollers in my secondary. mrquick68, sounds like we are having the same problem, also sounds like most everyone believes this to be a clutching issue. I think I will start with a new secondary spring, only problem is I might have to wait until next winter to try it unless this weather pattern changes

 

[caper11]

Don't know what to tell you then. My sled was doing the same dang thing and those were the culprits. Holding the new ones and the old ones next to each other I couldn't see or feel a difference. But appantely at 8300 RPM the clutch can tell the difference. One or both slip just a little and you lose RPM.

You issue is definately a clutching problem.

I can't get my head around this one. If something mics to spec and there is no cracks in the bushings. How is that part bad? I replaced the sliding bushing on my 09 because it was at the upper end of the tolerance. But I didn't change the spring cover because the bushing had 2 tho wear. This was on my 09 with 1500 miles on it and my sled had no rpm issues. The original poster said it always did this and hoped the clutch kit would help with the problem.

 

[PJ-Hunter]

I guess it could be a couple other things. The DPM solenoid is sticking under a load. But he said the DPM checked out.

The only other thing is that he may be a touch fat on the main jet circuit, just enough to load up, hence dropping RPMs. Not on a steep hill and on a flat where the load is not as heavy, it'll take less fuel to maintain 8300 rpm. Now this can mean a couple things, the main jet is a size too large or we end up going back to the DPM sticking whick will create a "rich" condition under a load.

So, pull the DPM solenoid and squirt some lubricant (WD40 or whatever) on the solenoid. If that doesn't cure the problem then drop down a size in the main jet. If he had EGTs then he'd know for sure if it was a fueling issue.

 

[wpeak]

I've tried WD-40 on the DPM. I guess jetting is a possibilty, but plugs look good

 

[Wapow]

It's possible for the newly installed bushings on the primary to bind, which could lead to the issue you're having. I would start with swapping primaries off of a good running Ptek, to see if you can hold RPMs. If you have the same symptoms, swap the secondary. That process will tell you if it's a clutching issue, and if so, which one.

 

[winter brew]

Another thing to try before getting the wrenches out....swap for a fresh -377 belt. Belts do wear and over time they can drop RPM, even without visible wear.
Are there ANY mods to the sled....some things that commonly cause RPM drop are: head, pipe or secondary tower brace....not in every case, but a mismatch of parts or jetting frequently results in performance/RPM drop.

 

[PJ-Hunter]

I've tried WD-40 on the DPM. I guess jetting is a possibilty, but plugs look good

And they will, unless you kill the sled right then and there when the RPMs drop. If it's just a shake rich under load, any extra oil and fuel on the plug will be burned off when you go back into the needle or pilot circuit or the bottom end of the main jet circuit, ie going back down the hill and circling around to your buddies at the bottom. I use an EGT guage and I know exactly where I can reduce my jetting.

WB is right too. Change to a new belt and see. An older belt can get glazed or a "cupping" effect happens on the side and the belt slips. I just learned that you can prolong the life of a belt by scuffing the sides with scotchbrite or 80 grit and then washing in the dishwasher. I just did that with 2 belts and they look brand new now. Waiting for snow to try them out.

 

[wpeak]

Winter Brew no other mods except clutch tower brace. Whats with the clutch tower Brace?

 

[winter brew]

Take it off for a ride.....you'll be surprised.

 

[snowpatrol]

09 ptek

Thanks for the help, ready to pull my hair out. One more idea, could quick clickers cause this?

if they are the total factory clicker replacement bolts, they could be bad. ask dynamo joe. make sure you are using the factory clicker.

 

[snowpatrol]

09 ptek

Take it off for a ride.....you'll be surprised.

would you care to elaborate on the clutch tower brace? what are your finding's?

 

[wpeak]

Take it off for a ride.....you'll be surprised.

This will be the first thing I'll try..............if the snow ever comes

 

[winter brew]

would you care to elaborate on the clutch tower brace? what are your finding's?

Just something we have run across quite consistantly with customers.
I have never ran them on my sleds.

 

[wpeak]

That would make since, as this sled has always had this problem. I wrecked a 08', which I was happy with, pulled everything off that sled and installed in 09' and have never been happy with how it ran. ( clutch tower brace was one of the components )

 

[mrquick68]

interesting. i don't have a tower brace. i've got my parts all in the truck so 'brew and i will test my secondary spring and look over the clutch to see how it all looks. I'll post results on Thursday night.

 

[mrquick68]

Found out my secondary spring was sacked out. Seems like this was indeed the problem in my case. We'll find out this weekend if we can find some fresh to test our theory.

 

[wpeak]

Let me know what you find out, My problem could be a culmination of tower brace and bad secondary spring. Thanks for the input!

 

[snowpatrol]

can somebody out there tell me how a clutch tower brace is going to have a negative impact on performance or rpm's?