Bearing & Brake Question

B

blew by you

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Nov 27, 2007
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Thunder Bay ,Ont.
I just removed my drive axle should I be able to see to see the ball bearings from inside the tunnel in the bearing? (chain case side)Is this bearing not sealed? Also should there be a little bit of play with the brake disc on the jack shaft?Any and all info would be appriciated.
 

1) yes you can see the ball bearings from inside of the tunnel when the drive shaft is removed....
2) this bearing has the seal removed on the tunnel side but is present on the chaincase side... this is how Yamaha arranges the seals/ lack of seals on this, and the jackshaft bearing...
3) seems there is always a little play between the brake disk and jack shaft... a little is normal..
 
Last edited:
There is a seperate seal that you have to look through to see this bearing.

#5 is the seal that works with #35.

#3 is the bearing you see.
 

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  • Smoker Chain Lower seal.jpg
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If you have your drive axle out, it is a great time to pull the chaincase completely out and check / replace the bearings and seals. If you are not going to do this, then some grease the bearing and some don't. Yamaha chose to leave the backside seal off so the bearing would actually seep a small amount of oil (somewhat filtered) from the chaincase for lubrication. I feel that it is most important to ensure that the seal and he O-ring in the collar is lubricated and I usually put a new bearing in which comes lubricated. If you cram the cavity full of grease the oiling effect will likely not occur, but I suppose this could be ok as long as you keep it greased.
 
Not mentioned yet is the standard practice to replace the left side bearing. The one behind the secondary clutch. That one is the one that usually goes bad first.

When I had my case apart when I changed my track I replaced 3 of the 4 bearings. Upper and lower in the case and the lonely one on the other side that is part of the speedo takeoff.
 
FuzzButt said:
Not mentioned yet is the standard practice to replace the left side bearing. The one behind the secondary clutch. That one is the one that usually goes bad first.

When I had my case apart when I changed my track I replaced 3 of the 4 bearings. Upper and lower in the case and the lonely one on the other side that is part of the speedo takeoff.
Click to expand...
Yes, keep checking those clutch side bearings. Bent shafts due to heat from failed bearings is not much fun.
 
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