I have an 05' Eton 70 for my daughter. The boy was/has been playing pretty rough on it. The bike came limping back with him on it, and making terrible clunking sounds barely able to stay running. I wasnt sure what the problem was so I threw in a new spark plug and it seems to start and idle even better than before. I got on the bike to ride it around camp at that time, when I find that the bike will only surge forward and inch or two sporatically. It feels like I am on a manual bike and letting the clutch out just enough to engage then back to neutral.....repeatedly.
I admit, this bike has been through a bit of abuse by the older boys ( 10-12 ), without any issues until now...but it has not been jumped much, if at all.

ANY and ALL ideas as to the problem would be greatly appreciated. ( I assume it is within the auto-trans ) And I am new to working on bikes, since we have all owned bikes for only a year now.

Thanks in advance!
-scott

 

I would open the cvt up and take a look.

 

probably burned up the belt would be my guess

 

 

I opened the cvt area where the belt is located. I dont see much of anything wrong. The belt is not real tight, but it spins the pulley on the inside pretty fast. Correct me if I am wrong...This pulley is supposed to slide toward the outside of the spindle at higher revs which engages the "transmission"? If thats the case, it does not seem to be sliding outward to engage the trans/wheels.
Still surges forward and once every 3-5 seconds, will spurt 1 foot or so.

I'll wait for clarification or direction on any mistakes in my above message, before I take anything more apart.

thanks again.
-scott

 

The rear pulley has the clutch that engages the tranny. 3 shoes are forced out with centrifugal force and catch on the clutch bell.

I would pull the front variator and inspect the rollers. Make sure nothing got turn wrong and there are no "flat" spots that would prevent them from working properly. If that is OK, then I would pull the clutch and inspect the springs and bell. I've been told if the bell is a bluish color the clutch has been getting too hot (too much slippage) and MAY need replaced.

PS - Do not start the engine without the cvt cover ON. Can cause damage.

 

I removed the rear clutch assembly and the outer bell does look like it has been "blued"
The clearance between the clutch plates and the bell seem within reason. I have about 3/32 of actual clutch pad surface. Using a screwdriver, I can move all clutch plates outward a good 1/4 inch, which would definately grab the bell for propulsion.

Do the clutch plates expand only due to gravitation forces, or does the plate the houses the belt as it slides outward actually move the clutch plates to grab the bell? Did that make sense? The reason I ask is, when I manually pull/expand the belt guide closer to the clutch assembly, the pads do not move...and wondered if they are supposed to. My thoughts are that it is strictly gravity forcing the clutch to engage.

I dont think, by examining the clutch side, that this is my problem. Do these belt go bad often? My experience in serpentine belts tells me that they dont stretch, and if they do, it is very very little. The belt looks almost new, with a small amount of fraying on the sides.

Whats a "front variator"?

-scott

 

It's centrifigul force that forces them out. There is a front and rear variator (pullies) that the belt rides on. When you slide off the front variator, you will see 6 rollers on the inside. Inspect for flat spots or for one that may have gotten turned.

 

I understand this all now. Kinda simple now that I have it all in my hands! I pulled off the front variator, and ended up getting a bunch of rollers in my hand and the ground. [img]i/expressions/face-icon-small-smile.gif[/img]

Perhaps one of them were turned. I will put it back together and see if she is fixed. If not, I will order a new clutch assembly and perhaps a new belt.
I'll post the results when completed. Hopefully I can get to it today, as it seems to be slow here at work.

Thanks Raptorlegs!

-scott

 

Does it roll easily? If not, I guess it could be the drive gears.