[Cosmosdan]

My rear prop shaft u joints are shot. I haven't taken it apart yet but I think the   sliding joint is bad too. Just hit 1k miles and with the other issues I've had, I don't have the guts to tell the wife yet.

[NMKawierider]

My front shaft has always had some play..mostly on the splines and some in the u-joints themselves. Lately I had been feeling what I would classify as an out of alignment wobble or whip in that driveline when in 4wd. Today when I had it pulled-down re-clocking the secondary I gave it a good look and shake. The splines are significantly looser and has some definite sag. I have almost 700 miles. So for me too looks like something will have to be done by or before 1000 miles. I think I am going to pull the complete driveline and take it down to our local driveline specialists who make custom stuff and see if they can build a new one...except much better. 

[Cosmosdan]

My front is pretty loud but I'm ignoring right now. I'm currently getting a loud clunking noise from the rear over bumps. The popping and crunching noise back there also getting worse. Happens when letting off the gas or down hill. It's driving me nuts, the only thing I can find it the shaft.

[Scottzforce800]

There is a carrier bearing in the center of the two shafts. It houses two bearings between snap rings. They are wore out. Replace them and your vibration and knocking will go away. Of course my U-joints were still good, so this fixed mine.

[NMKawierider]

There is a carrier bearing in the center of the two shafts. It houses two bearings between snap rings. They are wore out. Replace them and your vibration and knocking will go away. Of course my U-joints were still good, so this fixed mine.

On mine I can see the movement on the splines. The bearing section is still tight.

[Scottzforce800]

That is strange. Did your Ujoints fail and cause this. Usually movement somewhere else will cause splines to wear out. Plus yours don't have many miles!!  Mine carrier failed at 4000 mile. But I really don't ride very hard.

[NMKawierider]

That is strange. Did your Ujoints fail and cause this. Usually movement somewhere else will cause splines to wear out. Plus yours don't have many miles!!  Mine carrier failed at 4000 mile. But I really don't ride very hard.

The U-joints are about the same as they were new..a slight bit of play which is weird for a new joint. The splines have always fit loosely though and I think under load and being out of alignment makes them wear oddly and faster. At least that's all I can come up with. And when I feel the "whipping" I can back-off the throttle and reset and it goes away. When it gets worse I'll deal with it. For now I can deal with it as it's not that bad.

[Cosmosdan]

I don't think there are carrier bearings.  The rear is very short.

http://www.alpha-sports.com/cfmoto_parts.htm

[Scottzforce800]

Cosmo, I am talking about the drive lines going to front stump (diff). There are two connected with carrier brg. Mine was wore out causing vibration between 20 and 45 in two wheel drive and thumping in 4x4 at low speeds.

[gfmoto]

Noticed mine making that "cluncking" noise. But only in high 2WD. When in low it doesn't do it. Like you said giving it gas and leaving up or going over small bumps. But again only in high. Which I try not to use anyway on the trails. Thought it was just to high of a gear to run on slightly rough terrain. Doesn't do it while on the road.  Maybe I'll do a video and see if this is what you're talking about and if it's worth a call to the dealer to get fixed.

[gfmoto]

Little worse when on bigger bumps.

[NMKawierider]

My Z8 has so much play in.. everything..starting in the transmission it's hard to nail-down where all this popping and noises are coming from. Just moving it from a stop in forward and reverse makes me think something is bad but its no different then when it was new. So I'm not going to worry about it until something happens.

[Cosmosdan]

Scott, the z6 doesn't have the carrier bearings. Just a longer 2 piece shaft up front. I get noise from there, but it is slop at the splines. I put very thick grease in there and it did last a little bit  but the noise came back. My rear shaft is the offender right now. It's very short and has play in almost every direction. I think the u joints and the spline all are bad. Made noise from new but it's driving me nuts now.

[JJIGLESIAS]

Same with my 625-3 many noises, nothing evidently broken, run like new otherwise