Sophomore Rider
Currently Offline
Posts: 168
Likes: 1
Joined: May 6, 2013 8:28:08 GMT -5
|
Post by keltex78 on Feb 14, 2014 11:08:09 GMT -5
Jonway YY250T, 244cc Honda clone:
I've recently been chasing down some unsual clatter from the variator side of my CVT. In an attempt to troubleshoot the issue, I removed the variator, then cranked the bike and noted that the clatter had stopped. I then reinstalled the variator with a new belt and new Dr. Pulley rollers, but on cranking the bike, I noted that the clatter had returned. Is tihs a normal clatter for a CVT/Variator or is this something more serious? At this time, the bike runs great, no hesitation or bogging. The clatter is constant up until ~30mph when it smooths out.
The change in volume at the halfway point was my moving the microphone away from the bike slightly...
|
|
|
|
Post by alleyoop on Feb 14, 2014 13:19:47 GMT -5
Most of the 250s have grease in the VARIATOR and a cover over it with either 3 or 4 screws holding the cover onto the Variator. They put that grease in to silence the variator. It appears that the rollers used in the 250s are little undersize and have to much play in the ramps. So if you cleaned out the grease you will hear more shatter from the rollers. Alleyoop This is a HELIX VARIATOR:   |
|
Sophomore Rider
Currently Offline
Posts: 168
Likes: 1
Joined: May 6, 2013 8:28:08 GMT -5
|
Post by keltex78 on Feb 14, 2014 14:41:11 GMT -5
Alleyoop, Yes, my variator had an extremely thick and sticky grease from the factory. It appeared to have mostly been slung to the outside edge of the variator where it harderend in place, and none was left on the ramps. When I replaced my rollers, I thouroughly cleaned the variator and installed the new Dr. Pulley rollers. Per directions received here, I did NOT relube the variator and new rollers. I purchased new rollers that were 23*18, the same as the factory rollers, and the same as recommended for my bike. Should I have purchased 24*18 rollers? I'm beginning to think my next step would be to purchase a new variator, but a Dr. Pulley is $170!  |
|
|
|
Post by alleyoop on Feb 14, 2014 14:54:31 GMT -5
What I think you should do is fine out which way are the rollers undersize HEIGHT wise or WIDTH wise. And then try to find 1 size bigger. The first number is the Height and the 2nd number is the width. So to find out which one is undersize I would clean out the Variator completely put a weight in there and shake side ways to see if it bounces off the side of the ramps and then up and down to see if the height is undersize and is loose against the PLATE.
Alleyoop
|
|
Sophomore Rider
Currently Offline
Posts: 168
Likes: 1
Joined: May 6, 2013 8:28:08 GMT -5
|
Post by keltex78 on Feb 14, 2014 14:59:20 GMT -5
Hmmmm... okay... and that would also explain why my rollers don't seem that secure. When I completely assemble the variator, then shake it upside down, rollers can be dislodged from their ramps. I mentioned that in my other thread and no one seemed concerned...
|
|
|
|
Post by rockynv on Feb 16, 2014 19:32:10 GMT -5
As a general note one should be carefull about running a 250 without the variator in place as on some designs such as the Piaggio the variator presses against the timing gear to keep it properly positioned on the crank so if you run without it the timing gear can come off and slip the timing chain or break it. If the key comes off or the chain breaks then you may have to split the case to put everything back in order.
|
|
|
|
Post by nulldevice on Feb 16, 2014 20:57:17 GMT -5
Sounds more like a really loose valve adjustment or exhaust leak to me.
|
|
|
|
Post by alleyoop on Feb 17, 2014 16:22:24 GMT -5
He already varified it was the rollers making the noise, He took the variator off and started the motor no shatter, put the variator back on and shatter.
Alleyoop
|
|
..BAD TO THE BONE..
