new to me '08 Nytro RTX -- clutch noise

[Mills]

Just picked up a new to me '08 Nytro RTX (my first 4-stoke) and really like it except all the clutch noise. I have read here on T.Y. that this is common complaint. Are there any fixes to the noise? What is the root cause of the noise? I have been trying to search the General Nytro forum but don't see anything on the root cause or if there are any fixes.
Mills

 

[natedawgedog]

it isnt the clutch so much that is making the noise its the stub shaft between the clutch and crank. there is a long discussion on this subject if you use the search.

 

[1975FA]

If you are talking about the rattle at an idle, it's because the clutch is mounted on a stub shaft that is splined to the crankshaft. The splines jingle. With the engine off grab the clutch and try and rotate it back and forth, you can feel the play.

 

[natedawgedog]

http://www.ty4stroke.com/viewtopic.php? ... tch+rattle

here is the discussion, long story short, many have tried none have gotten rid of it permanently

 

[Mills]

Thanks for the link, I will be sure to read through it. Being a design engineer I may have some knowledge that I can apply to the problem to see if I can create a cure to the cause rather than a control of the symptom. I will report back on the linked discussion what I find.

One other question, with the sled shut off i can grab and rotate the secondary back and forth through about 30 degrees of free rotation before coming to what seems to be a hard stop somewhere in either direction. Is this because of the reverse gear system in the chain case or do I have something going wrong in the drive train?

Mills

 

[Nine2Nine]

Normal

 

[Mills]

It good to hear this is normal but, what is allowing it? I would like to understand this from a mechanical standpoint i.e. what parts are involved.

I have noticed that when I back off to slow down and then get back on the throttle to accelerate there is a little clunck in the drive train that I believe is coming from this issue. Is this normal as well and is it coming from the same mechanical parts that allow the secondary to rotate freely like I had explained in my original post?
Thanks,
Mills

 

[1975FA]

It good to hear this is normal but, what is allowing it? I would like to understand this from a mechanical standpoint i.e. what parts are involved.

I have noticed that when I back off to slow down and then get back on the throttle to accelerate there is a little clunck in the drive train that I believe is coming from this issue. Is this normal as well and is it coming from the same mechanical parts that allow the secondary to rotate freely like I had explained in my original post?
Thanks,
Mills

With the engine shut off grab the primary clutch and rotate it forward and backward. You will feel the looseness in the splines. Under load presure is held on the splines, you hear it clunk as the splines are pulled one way.

 

[Mills]

what about the secondary clutc rotation what is allowoing that

 

[Mills]

Bump^^^

What about the secondary being able to rotate +/- 30 degrees by hand. I was told it is normal but, I want to know what is allowing that to happen.

 

[1975FA]

Bump^^^

What about the secondary being able to rotate +/- 30 degrees by hand. I was told it is normal but, I want to know what is allowing that to happen.

It's chain slack. To check chain ajustment, screw in the ajuster screw finger tight and back it out 1/4 turn.