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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Big_B on May 27, 2019, 02:25:37 PM

Title: Poly Final Drive Bushings instead of Needle Bearings
Post by: Big_B on May 27, 2019, 02:25:37 PM: I found these poly bushing replacements for the needle bearings in our final drives. Does anyone have experience with them or reasons why they may be a bad idea?

https://www.ebay.com/itm/183706367525?_trksid=p2485308.m570.l5999&_trkparms=gh1g%3DI183706367525.N36.S1.R2.TR3
Title: Re: Poly Final Drive Bushings instead of Needle Bearings
Post by: Laitch on May 27, 2019, 05:06:39 PM: If FAG has the same type of specification table for the 10-6495a bearing that Roehling provides for Sustamid 6, a comparison would help settle matters. Sustamid already has a track record of successful use as bearing and bushing material in machinery.

The drawback here is that you need to rely on the precision of the vendor's machining without having any references for them as a company—that I could find anyway. Additionally, they have only been able to estimate the product's lifespan because its road-testing is still underway. It's encouraging that they're open about that. It also appears that this product is really new to the market. It has not created havoc with their test moto so they're saying, Feck it; let's sell some! :giggles Right on!

Consider yourself a test pilot if you go for this. I'll be surprised if there's a cascade of user reports on this one any time soon.
Title: Re: Poly Final Drive Bushings instead of Needle Bearings
Post by: volador on May 27, 2019, 05:27:14 PM: https://www.youtube.com/watch?v=kUsFWO08CO0

Have only seen these bushing replacement kits

Rubber Chicken JL Paralever Bushing Upgrade Kit (http://www.rubberchickenracinggarage.com/bushings.html)

Ted Porter's Ei Paralever Bushing Kit R100GS/ R100R/ K100RS/ K1/ K11RS/LT (http://www.beemershop.com/Merchant5/merchant.mvc?Screen=PROD&Product_Code=TRA11092)

AdvRider (https://advrider.com/f/threads/any-wisdom-on-rubber-chicken-bushings-as-replacements-for-fd-pivot-bearings-on-11gs.794414/) might have some info

Some more info (http://www.k100-forum.com/t6870-rebuild-4v-final-drive-pivot-bearings)

Installation video of Ei Bushings (https://www.youtube.com/watch?v=WBt6ftaJ_0s)
Title: Re: Poly Final Drive Bushings instead of Needle Bearings
Post by: Laitch on May 27, 2019, 07:01:59 PM: What's driving the interest about these poly bushings in both Belarus and Massachusetts is they cost generally 60% less than regular bearings. If the EI kit has a good track record, it seems like a good choice.
Title: Re: Poly Final Drive Bushings instead of Needle Bearings
Post by: caveman on May 27, 2019, 11:35:16 PM: I've met and delt with Tom at rubber chicken and he seems like a straight shooter, I'd give it a try!
Title: Re: Poly Final Drive Bushings instead of Needle Bearings
Post by: Big_B on May 28, 2019, 02:49:39 PM: Quote from: Laitch on May 27, 2019, 07:01:59 PM
What's driving the interest about these poly bushing in both Belarus and Massachusetts is they cost generally 60% less than regular bearings. If the EI kit has a good track record, it seems like a good choice.

You're correct the price point is driving my interest in a solution. $40 includes shipping while OEM is $50 per side, seems like a no brainer if they work. I'll see about ordering a set after I get Big Blue to fire up again. Just keep telling myself that test pilots are much cooler than guinea pigs!