Primary clutch issues (ulmer)

[Hammer70]

Yamamarc, that pic of your belt in secondary, is it the 8JP? I'm running with 8JP and even using my adjuster mine sits a bit lower. It adjusted just enough to avoid the squeal. I have 6-1 wrap on secondary, not sure if that plays a role in getting belt to sit higher in secondary.

What kit do you have I think yamamarc is running a 8dn same as mine

 

[rbell14]

Got it, I have the big venom kit from thunder products.

 

[yamamarc]

Yamamarc, that pic of your belt in secondary, is it the 8JP? I'm running with 8JP and even using my adjuster mine sits a bit lower. It adjusted just enough to avoid the squeal. I have 6-1 wrap on secondary, not sure if that plays a role in getting belt to sit higher in secondary.

Mine is 8dn rbell I also have the osp adjuster

 

[jeffgilbert]

i would take the clutches off and make sure you don't have any broken or worn parts first. I could never get any good out of the 8dn I always went back to 8JP. when my rtx was N/A i was running OPO spring 2 washers and 1 tungsten in the heal 1 washer in the tip 6-2 wrap with a red spring but had a H helex. I always liked that setup it was very good for low end pull and great back shifting i wasn't worried about top end because my sled is the rtx le 1.7 with the lower gears.

Call Ulmer he will be able to help you out, if you cant get him right away leave a message and he will gets back to you as soon as he can, usually within the day.

 

[Hammer70]

i would take the clutches off and make sure you don't have any broken or worn parts first. I could never get any good out of the 8dn I always went back to 8JP. when my rtx was N/A i was running OPO spring 2 washers and 1 tungsten in the heal 1 washer in the tip 6-2 wrap with a red spring but had a H helex. I always liked that setup it was very good for low end pull and great back shifting i wasn't worried about top end because my sled is the rtx le 1.7 with the lower gears.

Call Ulmer he will be able to help you out, if you cant get him right away leave a message and he will gets back to you as soon as he can, usually within the day.

Hi Jeff I pulled both clutches off cleaned and inspected , no issues all good and smooth. The belt width was the only thing that was out to thin 8dn. So what I did was had a 8jp belt with 100 Kms on it did 6/1 wrap set belt up try it out this Saturday. Ulmer is a great guy,I did leave a message Tuesday he usually gets back must be real busy. Thanks for your input

 

[AndyB]

Not to take away from Hammer70's issue but I also am having some issues with my 2014 SR Viper LTX SE getting anywhere near the max RPM's. I also had Allen Ulmer machine both the primary and secondary and set up both clutches for the low elevation sport trail riding that I do out here in Maine; using the 8DN belt. Amongst a plethora of other modifications on this sled it has the Ulmer air intake system, re-flashed ECU by EVO Powersports with the "2.5 flash" (9800 rev limit, timing adjustment based on 91 octane minimum), a Bikeman Performance open exhaust (LOUD!) and a different gearing ratio Allen suggested so I could get the sled around 105-110 MPH. Total weight on sled (rider and all gear) when riding is around 265 lbs. I also verified that at WOT the throttle bodies are indeed opening up all the way and they are... I originally thought this might be the culprit.

The original primary clutch setup from Ulmer had the cam arms weight at 6-0-3 (heel to toe). 2 washers to the left side and 4 washers to the right side on the heel--- nothing in the middle--- 3 washers to the left side at the toe. Primary clutch has a black spring. The secondary has the red spring in it with a different helix Allen put in there. I have no squealing and the belt sits "ever so slightly" above the secondary. The deflection is good as well.... only 1- 1mm washer per bolt on the backside of the secondary. I have no wear marks on the primary or secondary from the belt. The clutches run pretty darn cool anytime I put my hand on them to see if they are getting hot after riding for a bit.... the actual sheaves have some heat on them but placing my hand on the front of the primary or secondary there is very little heat.

My dilemma is that at WOT I was only getting 8400 RPM MAX! I spoke to Allen last week and he said to take off ALL the toe weight which I did and that got me up to 8600 RPM MAX. I am WAY LOW from where I should be. I would think with all these mods I should be able to run around 9600 give or take. The sled is topping out at 85 mph even with the gearing change. The sled originally had good low end pull and felt good all the way to WOT. After taking off all the toe weight I feel I lost a tiny bit on the low end pull but seemed to pull nicer in the mid range.... again just my "feelings."

I do not know if the belt is traveling all the way to the top in the primary or all the way to the bottom in the secondary. Not sure how to test this? Can I put the sled on a stand and go to WOT with no load on the track? I would think I can't do that.? Is there another way to verify this? Sharpie marks on the sheaves and see if they get worn maybe?

Trail conditions here in Maine are pretty darn solid... that is the actual trails! GREAT conditions for trying to go as fast as possible in a straight line... not so great for cornering! (there have been a few deaths in the state already from the icey conditions and people dying from "blunt force trauma" hitting trees going around corners at excessive speed)

I left a voicemail with Allen the other day on the results of the toe weight being removed. I am just waiting for a call back now.... he's SUPER BUSY this time of year I know... and he's in "hot demand" by us all trying to get his expert opinions! I am leaving for a weekend riding trip tomorrow so I am hoping to get some input on what other changes I can make to get me closer to the 9600 RPM (105-110 mph) or so.

thanks in advance... Andy B.

 

[TD Max]

i would take the clutches off and make sure you don't have any broken or worn parts first. I could never get any good out of the 8dn I always went back to 8JP. when my rtx was N/A i was running OPO spring 2 washers and 1 tungsten in the heal 1 washer in the tip 6-2 wrap with a red spring but had a H helex. I always liked that setup it was very good for low end pull and great back shifting i wasn't worried about top end because my sled is the rtx le 1.7 with the lower gears.

Call Ulmer he will be able to help you out, if you cant get him right away leave a message and he will gets back to you as soon as he can, usually within the day.

Same here except I use the 8DN. I did try the 8JP and as I recall I kind of liked it initially, but as I recall it faded as it got warm.

 

[Rye_Guy78]

Same here except I use the 8DN. I did try the 8JP and as I recall I kind of liked it initially, but as I recall it faded as it got warm.

I have found the same thing with 8JP, feels good, early morning blast across the lake no problem. Come across the same lake after a day of riding and I hit my max rpm but then start to lose rpm, pulled it down to 8000 before I let off. I will be putting the 8DN back in.

 

[TD Max]

I'm running the Gates 4340 I believe which should be the 8DN equivalent. I'm contemplating trying the Gate 8JP equivalent. Wondering if maybe the shorter belt might be the answer. I would assume that Gates uses pretty much the same compound.