Yamaha Starbike Forum banner

1 - 20 of 21 Posts

·
Registered
Joined
·
362 Posts
Discussion Starter #1
My bike has 7700 miles and started making a noise that appears to be coming from the rear drive. I first notice it above 20 mph, in all gears, accelerating, holding constant, decelerating and coasting (clutch in). Sound is like a small pebble bouncing around inside the case. I need to do more diagnostics, but my first inclination is a bearing failure. A quick google reveals a common bearing failure in the gear case. Some quick questions: does anyone have access to the actual bearing numbers used (some prices look hefty on part sites); is Clymers or Haynes a better repair manual; are special tools required or can the average bear tackle the job? I greased all the splines at 7000 miles and the gear case is full of oil. I plan to get a stethoscope and run the bike on my lift to see if I can locate the source of the noise. thanks.
 

·
Registered
Joined
·
6,626 Posts
maybe there is something loose inside the gear side or the drum brake side

but I would think anything loose in there would bounce around at low speeds, and get pinned to the wall at higher RPMs

you can google Yamaha V Star 650 Factory Service Manual, and find it online as a free pdf download
 

·
Registered
Joined
·
362 Posts
Discussion Starter #4
KCW. Thanks, already have owner and shop manuals and all OEM parts diagrams. What worries me are posts #1 and #13 discussed on this site... https://www.venturerider.org/forum/showthread.php?28581-My-VStar-650-Final-drive-story.
Seems like they are pointing at bearing no.10. on the attached diagram being a common failure. Ever heard of it? https://www.partzilla.com/catalog/yamaha/motorcycle/2007/v-star-650-silverado-xvs65atw/drive-shaft. Sorry for the links.. couldnt find a way to copy/paste.
 

·
Registered
Joined
·
893 Posts
did you check the coupler spline between the drive shaft and the differential.This is a common spline to miss. You have to take the 4 bolt nose off of the differential. also grease the rubber boot with the spring that the drive shaft goes thru. If it is not lubed it will create a groove in the drive shaft allowing water,sand and other nasty things into that coupler. I have replaced that coupler twice, the drive shaft once and the differential once. All of my failures were inside that nose. ( this was over the course of 120k miles on my XVS 650) and they were all spline failures , when that coupler is starting to go, it will pop and rumble at all speeds. It will also have slack between drive shaft and differential that you can feel with someone holding rear brake and you trying to turn drive shaft by hand using channel locks on the drive shaft. There is nothing worse then sitting at a light , letting out the clutch and having that coipler let go . It is a horrible noise that you would swear the whole world is coming apart right under you.
 

·
Registered
Joined
·
362 Posts
Discussion Starter #6
did you check the coupler spline between the drive shaft and the differential.This is a common spline to miss. You have to take the 4 bolt nose off of the differential. also grease the rubber boot with the spring that the drive shaft goes thru. If it is not lubed it will create a groove in the drive shaft allowing water,sand and other nasty things into that coupler. I have replaced that coupler twice, the drive shaft once and the differential once. All of my failures were inside that nose.
thanks for the feedback Jspree. Yes, I did pull back the cone, removed coupler, cleaned out all old grease and re-lubed all splines with Loctite 80-12. You have given me several more things to check. Much appreciated.
 

·
Registered
Joined
·
298 Posts
When was the last time the final gear oil was replaced?. Not that it matters in this case, but check to make sure there is gear oil in the case.
 

·
Registered
Joined
·
6,626 Posts
if the wheel bearings are suspect you can also check for play or wobble in the wheel, with the tire off the ground
 

·
Registered
Joined
·
362 Posts
Discussion Starter #9
if the wheel bearings are suspect you can also check for play or wobble in the wheel, with the tire off the ground
thanks.. already on my checklist below. Hope to get 'er done first day of warmer weather... maybe next week.
[ ] Isolate noise w/stethoscope
[ ] Replace drive gear oil, check for metal
[ ] check runout/wheel play- dial indicator
[ ] Check for Loose spokes
[ ] Universal joint nut tight
[ ] check universal bearings
[ ] Spring clips secure on boots
[ ] Check coupler slop- hold brake, twist drive shaft
[ ] inspect universal to drive shaft spline
[ ] inspect drive Shaft to coupler spline
[ ] inspect coupler to pinion shaft splines
[ ] inspect final drive splines
[ ] check pinion shaft bearings
[ ] check rear wheel bearings
[ ] check for loose brake parts
[ ] check for bent axle shaft
[ ] Assembly verification- all parts, right order
[ ] Lube seal- cone to drive shaft
[ ] Lube hub spacer on axle bolt
[ ] drive to wheel hub alignment-add shims if needed
[ ] Final drive torquing sop
 

·
Registered
Joined
·
6,626 Posts
only think I can add to your list: make sure nothing is loose under the fender, like a cable dragging on the wheel, or a saddle bag mount bolt....
 

·
Registered
Joined
·
3,062 Posts
if I don't fix the noise, I may have to take up drinking (a lot!). Have a favorite beer to recommend??
Not really i am a beer sewer not connoisseur. I have learned to expand my horizon. BlueMoon from miller is a good go to beer. Daily drinkers Coors Light, Bushlight.Leininkugles has a vast array of good beers Honey Weiss Summer Shanty
 

·
Registered
Joined
·
362 Posts
Discussion Starter #18
thanks.. already on my checklist below. Hope to get 'er done first day of warmer weather... maybe next week.
[ ] Isolate noise w/stethoscope
[ ] Replace drive gear oil, check for metal
[ ] check runout/wheel play- dial indicator
[ ] Check for Loose spokes
[ ] Universal joint nut tight
[ ] check universal bearings
[ ] Spring clips secure on boots
[ ] Check coupler slop- hold brake, twist drive shaft
[ ] inspect universal to drive shaft spline
[ ] inspect drive Shaft to coupler spline
[ ] inspect coupler to pinion shaft splines
[ ] inspect final drive splines
[ ] check pinion shaft bearings
[ ] check rear wheel bearings
[ ] check for loose brake parts
[ ] check for bent axle shaft
[ ] Assembly verification- all parts, right order
[ ] Lube seal- cone to drive shaft
[ ] Lube hub spacer on axle bolt
[ ] drive to wheel hub alignment-add shims if needed
[ ] Final drive torquing sop
I wanted to post the hopeful resolution of my noise in the final drive, in case it might help someone else down the road. It was a metallic dinging that showed up after the wheel was removed for a new tire and spline lube.
I had convinced myself that it had to be an internal bearing failure. Turns out, it was the axle bolt that was not true. The axle bolt is 14mm in diameter and is stationary in the swing arm after being torqued. The wheel bearings which are pressed in the hub then slide over the axle and are are loose fit at 15mm id. Between the wheel bearings are a spacer and shaft collar that rotate around the axle.
I eliminated the noise with these steps:
  • raised motorcycle on lift so that rear wheel was just barely touching the floor (take load off wheel bearings)
  • marked position of axle bolt head, completely loosened axle and tapped out very little so bolt head flange wasnt dragging on swing arm slot.
  • rotated the bolt thru several revolutions to find a point where it turned most freely in its full revolution (tricked I picked up in another old posting)
  • marked the bolt to ensure it did not shift when torqued down.
This resulted in the axle bolt being turned about 90 degrees from where I started. Noise was eliminated and hasnt returned after 3 fifty mile trips. It was showing up before continually. I have read that "bent" axles are common even when new. My advice... mark the bolt head before removing the axle bolt to make sure you get it back to its original position. Sorry for the lengthy update.
 

·
Registered
Joined
·
6,626 Posts
that cant be good in the long run

if the axle is bent it will side load the wheel bearings -

sounds like one of those times where you nail a pot hole at 50mph - and..... oh geeze the bike seems to be ok - whew!

and then you find this
 

·
Registered
Joined
·
6,626 Posts
1 - 20 of 21 Posts
Top