no acceleration past 65 + high RPM

[b4s4e]

Hi Guys,

I own a 06 Vector with 8000 miles on it. Last winter, I noticed that past 75 mph, I had almost no acceleration. The RPM would reach above 9k, but I am almost not taking speed. If I hold it full throttle for what seems a very long period, it will eventually go past 80 and continue to accelerate until top speed is reached. I suspect the clutch to be the problem, but I have absolutely no experience with this. How and what can I check for wear?

Thank you very much

 

[sxr70001]

Have you ever changed your belt or cleaned your clutches. I would start with the simple things like that.

Lots of posts to search through to find out how to do things.

 

[b4s4e]

srx70001: Yes, the belt is almost new (Yamaha), few hundreds KMs on it. About cleaning the clutches, except with compressed air, no. I did search and read a few topics, but that didn't give me enough info on how to determine the wear on the clutches.

 

[sxr70001]

Here's one to get started. http://www.ty4stroke.com/threads/removing-and-cleaning-clutches.121784/

The main thing to determine is everything opening and closing smoothly and are the plastic buttons worn on the secondary. Some guys put them in the dishwasher and some spray them off with brake cleaner.

Personally, I just remove the belt and take off the clutches, clean with brake cleaner and rags, visually inspect everything looking for cracks and worn areas and put back together. Do not use any type of lubricant! You need a clutch puller to remove the primary, but you can take the cover off and clean it on the sled if needed.

The primary has 6 10mm bolts on it that you take off to remove the spring and get pressure off the clutch so you can move it through it's range of motion and the secondary has 3 nuts that you take off to remove the helix.

Pay attention to what holes the spring is in on the secondary and keep pressure on the top of the clutches as you remove the nuts or bolts so you don't mess up any threads. Also the primary cover has an x on it that needs to be matched up with the x on the clutch for balancing purposes.

When done I use light emery cloth to finish cleaning the surfaces where the belt rides and it wouldn't hurt to run that new belt through the dishwasher. Make sure you're belt deflection is set properly too. (another search)

If your sled is still acting up after that at least you will have clean clutches

Hopefully someone else will jump in and give their input too.

 

[4strokeluvr111]

I suspect that one or both of your clutches is the problem. Have you every had the clutches fully disassembled, checked and cleaned?

If not, personally, I would contact Travis at Barn of Parts and see what he's got for low mileage primary and secondary clutches. Will likely be cheaper just to swap out clutches than to buy all new parts to bring your clutches back up to par. Trust me, I know...the parts are EXPENSIVE!!!!

Be happy to help more if needed. PM me if you want.