Hi, i have a Zforce 800 53" 2015.
In the first 2000 km my top speed was always between 117 and 123 km/h at 6900 rpm. Since the last 500 km my top speed is 105 km/h at 7750 rpm (cut off).
I have check the belt and she look like new . Do you have and idea??
My speedo read 103 km/h and the gps say 105 km/h.

[2015 Z Force 800 53/Trail EPS]

Might not see it but belt wear and stretch does this as well as roller wear.

Hi, i have a Zforce 800 53" 2015.
In the first 2000 km my top speed was always between 117 and 123 km/h at 6900 rpm. Since the last 500 km my top speed is 105 km/h at 7750 rpm (cut off).
I have check the belt and she look like new . Do you have and idea??
My speedo read 103 km/h and the gps say 105 km/h.

Check your air filter. The stock ones arent the best and they clog up quick.

Do you know who make a good replacement belt ?
Anyone run the DR Pulley clutching ?

All belts will sterach a little. If you were asking about rollers and adjusting the secondary spring, there is info here on that. As far as the wet clutch, I don't think dr pulleys fits the HL clutch you have.

Thanks, i Will try a new belt.
Also, i want to make the motor run higher during accélération to have better power .
The clutching seem very off to what it should be.
I want the engine at 6500 rpm during acceleration all the time. Not starting to accelerate at 4500 and climbing slowly to 6500.
On my sled, when i hammer it the engine stay at 8000 rpm all the Time .

Thanks, i Will try a new belt.
Also, i want to make the motor run higher during accélération to have better power .
The clutching seem very off to what it should be.
I want the engine at 6500 rpm during acceleration all the time. Not starting to accelerate at 4500 and climbing slowly to 6500.
On my sled, when i hammer it the engine stay at 8000 rpm all the Time .

I sure hope you arent comparing a 2 stroke snowmobile to a 4 stroke utv... because their power curves are VERY different.

I know that, but the performance will be a lot better if the engine stay in is peak performance.
Two stroke or four stroke have nothing to do with that. Try a wildcat trail or a 4 stroke Yamaha sled and you Will understand what i try to have for clutching

Our clutching are good for casual Trail ridind but for performance the backshift is way to slow (not good for iniate a drift) and the engine run to low in rpm in acceleration.

If you are running stock size tires and not real high alt. try 24g rollers/sliders to move the RPMs up and moving the secondary from B1 to A1 for a little move backshift. This should help a bit. If you want more stall than you will have to monkey with the wet clutch and right now there is not a lot of info to go on.

Thanks a lot, i will try this week end .
Do you know where a can order the roller/slider?

[2015 Z Force 800 53/Trail EPS]

I've been playing with settings myself and here are 5400 feet I run all the way up to 12000 feet with 27" tires. I started with the B2 setting and 22 gram sliders and it did lock in at between 64 and 6600 rpm on backshift but I though that went over the torque curve a bit far so I went down a notch to C1 with the same sliders. Now it backshifts to 56-5800 and holds there until full shiftout. Then the RPMs go up to the limiter. For my needs, this works well and its a killer on the trail. Almost no need for low range anymore. Here's a quick vid from today.

https://www.youtube.com/watch?v=Xe7GH7z8X2s