upper gear bushing

[Turboflash]

Not easy to find Dan, I called the local automotive store yesterday and they couldn't get one. I rooted through my junk drawer in the shop and found one .025 thick, which is what it needs to be when both of the .060's are used on the inside.
I'll look more today and let you know if I find something.

Here's one from McMaster Carr that is close. OD is a little smaller.
0.025" Thick. (-0.0025" to 0.0025" Tolerance)
ID = 1" 0" to 0.011", OD = 1 1/2" -0.002" to 0.002", 316 Stainless Steel Rockwell B70 ASTM A240 10 97022A773 10.91

Also maybe could check Seastrom Manufacturing or Phoenix Specialty Washer to see if they have something in stock?

 

[ROCKERDAN]

Was brought up before but never answered. Who has checked gear alignment?

I know my top gear and chain looked to run too close to rear of case, all new stuff going back together. I would prefer a shim behind there for sure.

Dan

 

[ROCKERDAN]

Here's one from McMaster Carr that is close. OD is a little smaller.
0.025" Thick. (-0.0025" to 0.0025" Tolerance)
ID = 1" 0" to 0.011", OD = 1 1/2" -0.002" to 0.002", 316 Stainless Steel Rockwell B70 ASTM A240 10 97022A773 10.91

Also maybe could check Seastrom Manufacturing or Phoenix Specialty Washer to see if they have something in stock?

I was just finding same thing brother....Great minds

Dan

 

[74Nitro]

Here's one from McMaster Carr that is close. OD is a little smaller.
0.025" Thick. (-0.0025" to 0.0025" Tolerance)
ID = 1" 0" to 0.011", OD = 1 1/2" -0.002" to 0.002", 316 Stainless Steel Rockwell B70 ASTM A240 10 97022A773 10.91

Also maybe could check Seastrom Manufacturing or Phoenix Specialty Washer to see if they have something in stock?

I found another option from Yamaha. Part # 90201-252F1-00
.5 mm thick. (.020 thou)
This is in the 2006 tech update book from Yamaha, and is used on the jackshaft behind secondary.

 

[silver rocket]

Does the Bikeman gear bushing look to be same as stock?

i do not have a stock one to compare. Sold the stock 21/41 gears and chain. Also have the Bélanger racing jackshaft and bearings, and manual chain adjuster. Also added a steel washer of .030 close to the snap ring. Everything was replaced at 2000 klm when i lost the reverse. The jackshaft splines were worn out. I had warranty but i wanted realibility so Cat parts was not an option for me. The 21/38 gears and chain from Bikeman were $600.00 USD, $300 for the jackshaft and $165 for the bearings. Only problem i got with reverse is the servo motor, had to take the cover off to clean the it. Now at 29000 klm.

 

[Tarzan]

With the shims on either side, could this limit the amount of oil getting in to lubricate?

Could drill some holes tru the chims so more oil comes to the bushing

 

[74Nitro]

Not sure the holes do much. When it is spinning the centrifugal force throws oil away from where it needs to be.

 

[74Nitro]

I'll tell you tomorrow as I have a 48 on the way.

 

[geez150]

I will brainstorm with you. Could it be that smaller upper gear(20-21-22) VS 24 tooth wear more on the bushing? The chain has more force on the smaller gear vs bigger gear. Think about the track that runs on bigger idler wheels ,its running more free and more HP to the ground VS smaller wheels. Also if the chain is stretch and you have nearly nothing left to go on the chain adjuster the chain is wearing more on the upper gear becouse of the angle of the chain. Less angle on the chain less stress on the upper gear and more hp to the track and ground.

I like this a lot. To me it makes total sense about chain angle and such. Also makes me think that the guys not running the 1.5 turns out are changing the angle and of course putting more down force on the gears, tensioners and so forth inside the case. 3500 miles on mine and have always done the 1.5 turn on the chain and idI say it's hardly stretched at all as it seems I count the same number of threads before and after adjustment. I am looking forward to taking the case apart to inspect my gear and tensioner, knock on wood no issues to date, this is a cat with stock 24/50 gears.

 

[74Nitro]

View attachment 147600

This is 24/48 with the same chain that came on it for 24/50.
The adjuster goes down to only one thread left but the aluminum spacer is still on the bolt.

 

[swampcat]

Does your 24t gear have the oil holes ?

 

[74Nitro]

Does your 24t gear have the oil holes ?

Yes, not sure they do much though.

 

[ClutchMaster]

Here's one from McMaster Carr that is close. OD is a little smaller.
0.025" Thick. (-0.0025" to 0.0025" Tolerance)
ID = 1" 0" to 0.011", OD = 1 1/2" -0.002" to 0.002", 316 Stainless Steel Rockwell B70 ASTM A240 10 97022A773 10.91

Also maybe could check Seastrom Manufacturing or Phoenix Specialty Washer to see if they have something in stock?

When I installed my McMaster bushing I had to lightly sand it with 220 grit paper to get it to fit perfectly. They will be tighter than the stock bushing slightly.
Get the 660 bearing bronze not the oilight bushing. The 660 is better for lubricated gear case applications.

 

[ClutchMaster]

McMaster part # 6381k563
It’s 1” long so you will need to trim the length a little bit.
I press it in the gear and cut it off flush with a hack saw. Don’t worry about harming the gear it’s hard and the hack saw won’t even damage it.

 

[ClutchMaster]