LOWERING XTX ENGAGEMENT

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Just wondering what kind of clutching you xtx guys are running to get engagement RPM down. I'm sick of the jerky take off and it's got to be hard on the belt when just putzing around. Also I've already blown a belt in 450 miles. Gota do somthing different. I thought I saw where someone changed springs but I can't find it on the serch. Thanks

T
 
I had the same issue untill I adjusted the belt deflection, ,much smother now.

try that first worked great for me
 
Its really hard to beat Yamaha's stock clutching, especially to try to lower the rpms. 450 miles seems a bit short, I wonder if you may have had a defective belt? I have just about that many HARD miles on my XTX, and the belt looks just fine.
You may also want to check the belt height in the secondary. If it's sitting too low, that may raise your rpm's somewhat.
 
There are four ways to lower engagement

1. Softer Pr-eload Primary spring

2. If you have a Fly weight like a heel clicker that allows you to add weight to the heel of the weight

3. shift the movable sheave over slightly. This is called "changing the Neutral position. You can do this with a Mega Power Dial engauge or a high tech 911 primary clutch cover

4. the last thing you can do is cut or shim the Spider. This isn't recommended for a trail sled
 
Turk said:
Smaller diameter roller
inner mass added to stock flyweight(minimal tho)
Click to expand...


Forgot about the Rollers. I wasn't sure id the Hole in the stock weight was far enough back to affect the engagement. Thanks for adding those Mr Turk ;)!
 
My stock clutches work great. No surprise, that's a Yamaha trademark as far as I'm concerned. Before I changed anything I'd make sure the clutches are properly adjusted, I'd clean the sheaves with a scotchbrite pad, and if the current belt has seen dirty sheaves I'd clean it with water, dish soap, and a soft brush.

I'm very careful to break in new belts properly. My spare belt gets broken in before it's stowed as the spare, too.

SB
 
stewartb said:
My stock clutches work great. No surprise, that's a Yamaha trademark as far as I'm concerned. Before I changed anything I'd make sure the clutches are properly adjusted, I'd clean the sheaves with a scotchbrite pad, and if the current belt has seen dirty sheaves I'd clean it with water, dish soap, and a soft brush.

I'm very careful to break in new belts properly. My spare belt gets broken in before it's stowed as the spare, too.

SB
Click to expand...


My sled does exactly what his sled does. It's just how they are setup. It's not a smooth engagement. It has nothing to do with a poor clutch setup from Yamaha, A dirty belt or dirty clutches. I'm guessing it's the profile of the weight that is causing the snap in engagement.
 
As you said earlier dirkdiggler, a new softer initial preload primary spring is needed to lower engagement.
 
I'm thinking about a softer spring but I'm scared I'll create a chain of other things I'm going to have to change to make it work right. When your baging this sled the clutches work fine it's the slow piddleing around that's giving me the slippage. I'm getting the nice black ring around the bottom of my primary. The 1.75 track probably doesn't help but I am verry carfull not to be too hard on the throttle when the sled is cold. What are you running Turk?

T
 
T T T said:
I'm thinking about a softer spring but I'm scared I'll create a chain of other things I'm going to have to change to make it work right. When your baging this sled the clutches work fine it's the slow piddleing around that's giving me the slippage. I'm getting the nice black ring around the bottom of my primary. The 1.75 track probably doesn't help but I am verry carfull not to be too hard on the throttle when the sled is cold. What are you running Turk?

T
Click to expand...


Honestly if you want to get rid of that black ring you need to take a look at the Clutching from Ulmer racing or The Drag and Fly heel clickers. I just bought a set of Drag and Flys. I'll post here tomorrow night what I think of them.

the reason you have that black ring is the weights aren't squeezing the belt hard enough on the bottom and the belt is slipping in your clutch. this is happening at slow speeds. The Heel Clickers and the Super tips Allen sells grab the belt better all the way through
 
dont be afraid at all,i put in a b-p-b primary spring,replaced the aluminum rivet(.85g) in the weight with a 2.44g rivet and set the secondary spring wind down to 60 from the stock 70,sled pulls harder out of the hole,lowers the engagement so no herky jerky and pulled a 108 on groomed trails with an rpm of 8700-8750,it dropped my 50mph cruising rpm from 6500 down to about 5900,no more slipping the belt when trying to load it on the trailer or turn slow around ,sled only has 300 miles so as it gets stronger i might have to load it down some more
 
i forgot to comment about the dirtiness of the clutches after 150 miles of riding with very few hard hits to the throttle,it was worse than ive ever seen a set of clutches and ive owned sleds since 91,factory clutching has way too little belt squeeze when you try to ease into the throttle and the secondary is set real tight to make up for the long track i guess,this sled is geared low enough that it doesnt hurt it at all to load the clutches,the 108 was with about 50lbs of ice underneath the tunnel so when i melt it off should see more speed,gonna go after the tunnel protectors in the morning to help ice problem,it even had ice all the way around both sides of the drive sprockets in the front not to get off subject too much
 
not to knock any clutch kits from all our aftermarket guys but i spent 3 dollars on the rivets for the stock weights and no more belt slipping on slow speeds,will it perform as well as the aftermarkets weights ,not sure but sure cheaper to start with this fix
 
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