upper gear bushing

[twyztid]

I also have 10-12 of the #CB161808 C93200 (SAE660) cast bronze bushings if anyone wants one. These have a 4000 rating for the P Value (pressure) which is higher than any oil-impregnated bushing (Oilite).

https://catalog.buntingbearings.com...c93200-sae-660-sleeve-plain-bearings/cb161808

 

[sideshowBob]

Here's my 21T top gear after 2200 miles on Stage 4. Bushing and gear still look really good. Could almost run it another 2200, but I won't. LOL

Looks good! What have you been doing different then others?

 

[KnappAttack]

Looks good! What have you been doing different then others?

Mine looked like that too, until I decided to run the chain tighter than spec like a idiot... That didn't take long to toast it.

 

[sideshowBob]

We are still riding here for a while yet, when the season is over, I will pull mine apart and see how the top gear bushing looks.
-21/37 gears with 8 x 3" drivers
-1.75 track
-tuned
-2200++ miles
-lots of very high speed long distance lake and rail bed runs
-Klotz graphite chain lube - 16oz
-chain adjusted every 1000 miles to recommended specs
I am very interested to see the bushing when I pull it apart.

 

[SAB1]

My buddy has 9800 miles on his ‘18 and I have 4800 on my ‘17. We both run our chains tighter than spec and have never touched the bushing or gear. We will be into that in May to see what they look like.

 

[fatchance]

Mine looked like that as well with over 2000 miles on it. Difference being I started with a tight chain... half a turn out. After a season on it the chain had stretched to plus 1/8" inch on the distance from the tensioner bolt to the tensioner. Put it back in and left the tension alone.

 

[Turboflash]

Looks good! What have you been doing different then others?

Checked it often (basically after every ride). 1-1/2 to 1-1/4 turns out from finger tight. Had to adjust it almost every ride - chain stretch. 16 oz. Amsoil Chain Lube.

 

[number1kyster]

I think riding style has a ton to do with the longevity of the bushing.

My Dad has almost 11,000 miles on his original top gear. He rides smooth trails only. No studs, very few top speed runs, and he eases into the throttle, and coasts into the corners. Chain tightened to spec with the recommended YamaLube.

I ride twisty trails, gas, brake, and I let my winder eat every chance I get. No studs, YamaLube, and my bushing was toast in 1,500 miles.

I only managed 500 miles this season. I'm curious to see how the McMaster bushing looks when I check it this fall. I also ran more oil and a looser chain for those 500 miles.

 

[ClutchMaster]

No studs, well you certainly aren’t loading it as hard as me or TUrboflash!!!
Are you overfilling you chaincase by atleast 4oz?

 

[ClutchMaster]

Loose chain is subjective imo

 

[Dr. FeeLGooD]

I think riding style has a ton to do with the longevity of the bushing.

My Dad has almost 11,000 miles on his original top gear. He rides smooth trails only. No studs, very few top speed runs, and he eases into the throttle, and coasts into the corners. Chain tightened to spec with the recommended YamaLube.

I ride twisty trails, gas, brake, and I let my winder eat every chance I get. No studs, YamaLube, and my bushing was toast in 1,500 miles.

I only managed 500 miles this season. I'm curious to see how the McMaster bushing looks when I check it this fall. I also ran more oil and a looser chain for those 500 miles.

I agree. These sleds cannot handle their own power. Mine crapped the bed at 2000 miles. Completely stock.

 

[ClutchMaster]

I agree. These sleds cannot handle their own power. Mine crapped the bed at 2000 miles. Completely stock.

Let me ask a couple questions,
Why would Turboflashes bushing look brand new at 2k miles?
Why do some N/A vipers wear out bushings quickly?
With your setup everything was new and it only lasted 2k miles without a tune?
What are the two biggest variables within the chaincase?

 

[J & J Racing]

I have run 15 wide Taylor gears since procross came out in 12. It has been same chaincase since. For specs I have elevated track and turn secondary clutch as I finger tighten bolt. When it stops at finger tight I back it out between 1/8 and 1/4.

I have a few stock cats with higher mileage we’ve done this way without issue also.

I run synthetic 15/40 motor oil and fill between 3/4 sight glass to full

the Taylor gears much better than stock. They run them in the out law sleds

 

[sideshowBob]

I have run 15 wide Taylor gears since procross came out in 12. It has been same chaincase since. For specs I have elevated track and turn secondary clutch as I finger tighten bolt. When it stops at finger tight I back it out between 1/8 and 1/4.

I have a few stock cats with higher mileage we’ve done this way without issue also.

I run synthetic 15/40 motor oil and fill between 3/4 sight glass to full

the Taylor gears much better than stock. They run them in the out law sleds

Are the Taylor bottom gears 15 wide as well?

 

[74Nitro]

Here's my 21T top gear after 2200 miles on Stage 4. Bushing and gear still look really good. Could almost run it another 2200, but I won't. LOL

You can however see in the right hand picture that the teflon is starting to come off. The picture is taken from the 'good' side.