Clutch rattle noise experiment

[rough rider]

I was bored today and pulled off my clutch on my 08 vector, rattles so much and did some inspecting, found that the weights were really sloppy from side to side with the stock yamaha shims ,so I went to local fleet and farm store and found some thicker fiber washers, I installed 1 of those and reused 1 stock yamaha washer on each weight and reassy It really tightened up weight, but I made sure it flipped up and down without binding up and reassy and ran , the clutch made alot less noise, better than what is was, but I still think alot of the noise is coming from the stub shaft that slides onto crankshaft ,if u grab on to clutch u can rotate clutch to the left and to the right a small amount ,it seems like the spline have excess play in them, This summer im pulling the stub shaft out and going to investigate alittle more,, Lifes short ride hard...

 

[jimo368]

I have noticed excess clutch noise from my 08 Vector as well. Mine has the same end play as yours so lets hope this is normal. Maybe the noise is only noticable because the engine is mostly quiet and the exhaust exits at the rear. Just guessing but, I will have it looked at during my first sevice. Other than useless handwarmers and windshield, I like the sled overall.

 

[HyperMax]

I also think the noise is from the stub shaft on my 08. What I wonder about is why my wifes 05 is super quiet. Some tolerance in the engine (stub shaft?) seems to have changed. My 08 has more free play than the 05.

 

[Len Todd]

What happens when you set the idle to 1600-1700 RPMs. On the RXes, the rattle goes away.

 

[rough rider]

I checked my freinds o6 vector and his clutch stub freeplay is way less than my 08 also and his is super quite, Why are the 08s having this issue??????

 

[Yeller]

My 07 nytro has the clutch noise as well and I'm just learning to accept it. Not sure how it compares to the noise coming from the 08s though. I can still hear it after engagement and at slow riding speeds but once I get rolling it's gone.

 

[sniperviper]

I checked my freinds o6 vector and his clutch stub freeplay is way less than my 08 also and his is super quite, Why are the 08s having this issue??????

From what I have heard and seen, the ratteling noice you are talking about does not come from the primary clutch. I know a yamaha mechanic and he told me that the noice came from the spline between the crankshaft and crankshaft assy (were your primary is mounted). The clearance/tolerance between this parts are bigger on the 08models than on the earlier models.

He told me that they have worked a whole lot with this rattleing noice issue, because of unhappy customers complayning about this. They have tested different clutches that did not make any noice on the sled they were taken from (earlier models that did not make this sound), but on this 08models the noice was the same as with the stock clutch on.

He also told me that they had tryed the shaft assy (nr.16 og pic) from a 07 model to see if it maybe could be this part that was "out" of clearance/tolerance specs but the internal movement between this part was just as big as with the 08 and stock shaft assy. He sayd that it seems that it was the spline on the 08 crank that was smaller than on the earlier models.

I know this sound very strange but I have seen the "bigger movement-between earlier mentioned parts" myself on the 08models compared to 07 and 06 models.

Hope you understand what I mean - sorry for bad english...

Posted earlier in this thread:
http://www.ty4stroke.com/viewtopic.php? ... highlight=

 

[twomorestrokes]

Your '08's are louder than the older versions??? That's the first time I've heard someone refer to the '05 as being quiet. We've all been fighting this noise since the Genesis 120 came out in '05. Tricks with the 4 cylinder do not apply as it is the odd firing impulses of the 3 cylinder that causes the clutch to be noisey. The '05's had an update program for the clutch that helped somewhat.

 

[sniperviper]

Your '08's are louder than the older versions??? That's the first time I've heard someone refer to the '05 as being quiet. We've all been fighting this noise since the Genesis 120 came out in '05. Tricks with the 4 cylinder do not apply as it is the odd firing impulses of the 3 cylinder that causes the clutch to be noisey. The '05's had an update program for the clutch that helped somewhat.

Guess that you havent heard a 08 idle?

 

[twomorestrokes]

Have you heard an '05 idle? Rattles like a diesel.

 

[sniperviper]

Yes but on this model you could add a "noice reduction kit" to make it a little less noisy, on the 08 this wont help because this noise kit is already installed (stock) and its not the clutch that make the noise.

 

[rough rider]

Sniperviper, Im glad you know what im talking about, I have checked a few vec tors from 05 -08s and the the clearance Or should i say slop between the splines on my 08 is much greater than the previos year models. All my buddys vectors including the 05s with the oring kit installed are all 10 times quieter than my 08 , I hope Yamaha tech guys read these posts so they know there is a issue, just like the handwarmers problems.

 

[bluemissile]

just because it's noisy dosen't mean there is a problem. my cummins rattles like mad because it's supposed to. just because it's something we dont like dosen't mean there is anything wrong with it. my nytro clutch rattles i say so what i don't care it still moves.

 

[LazyBastard]

First a disclaimer: I haven't tried this or known anybody who has tried this. If it works, great. If it messes up your engine and kills your dog, its your own fault for being dumb and doing something that you read on the internet.


The problem here is stated very clearly - the splined shaft at the end of the crankshaft has too much slop resulting in the output shaft chattering against the splines on the crankshaft.

I really have to question why they would use a splined shaft at all in this location. You would think that it would be simpler to just make the crankshaft longer and bolt the clutch straight on to it. If not that, then at least thread the clutch shaft onto the crankshaft.

Solution: lock the shafts together. Unfortunate problem is that it is difficult to come up with anything that can get stuffed into the splines that will fill the space and remain in place besides a LIQUID. I'm thinking perhaps something along the lines of loctite green or possibly some kind of epoxy.... something like that might work, however there are a few *possible* issues that I can think of with this approach;

1) balancing the quantity of loctite added to fully cover the splines and NOT LEAK into the engine when the shafts are assembled,
2) providing necessary air to the joint for the loctite to dry (not applicable in the case that epoxy is used),
3) will it remain in place permanently or will it ultimately fall apart and drop bits into the engine?

Again, I'm not advising anyone to actually try this, but rather to just THINK about this as well as other potential solutions.

 

[LJ 452]

At first, I thought, wow, this Nytro sounds weird at idle. The clutch is kind of rattling and making all kinds of strange sounds. Then I rode the sled. I no longer worry about the noise, as stated, my Cummins makes a rattle too, thing is I like the benefits of the Diesel more than the noise bothers me; (I actually like the sound). Anyway since it only really does it at idle I just say forget about it and ride. Since it's totally normal and isn't causing any harm learn to live with it. It's similar to the Mono transfer rod clunk, everyone gets so uptight about the clunk noise, who cares as long as the machine is running as it should. As LB stated the only thing that's really going to help it is to pack the spines with something, then you run the risk of it breaking down and getting into the bottom end. I'd prefer to keep the reliability of the noise then the danger of silence.