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Discussion Starter #1
Help!



I noticed that my 1987 TW chain started making a clanking noise on the last ride through the desert. I have it adjusted correctly yet it seems to be clanking on the swingarm right at the swingarm pivot. I was certain there was a black hard rubber piece that was on the swingarm to keep the chain from contacting the actual swingarm? If there was it is now gone. Honestly I just do not remember for sure and this time I can't blame my absence of mind on the booze!



I must be loosing my mind because when I look at OEM diagrams of both the swingarm and chain drive assemblies it does not jump out at me.



Can someone confirm or deny that this black rubber swingarm protector exists? Any idea on the part number at someplace like bikebandit.com or anywhere else? If it fell off with only mild off roading, this must be a common TW problem? Is there anyone or a link out there with a better fix for this issue? If a replacement is the issue, maybe some gorilla glue should be used to keep it on and in place?



For now the TW sits in the garage to avoid damage to swingarm or frame.
 

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Hello. The part you're looking for is on bikebandit.com the swingarm diagram part #14 on the picture.Same thing happened to me you've got to take the swingarm off to do it. I used an old handgaurd cut down n wrappred it around the swingarm in the areas that looked like they make contact. A cheap and quick fix so I can ride till colder weather and I'll replace it then.
 

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I lost mine too. It went through the front sprocket & de-railed the chain. The problem is it is held on by only 1 screw. Loctite that screw.



---------------------------

I posted this on the old board.



Chain Wear Strip.



The chain wear strip is held by a single M5 bolt. That bolt came loose while I was, fortunately, riding close to home. The bike was only a few months old at the time. It then got dragged by the chain into the front chain sprocket which proceeded to chew it up but the chain got derailed in the process. I heard peculiar noises and no drive so coasted to a stop and soon saw what the matter was. I phoned my wife who came & collected me. I went back with some tools. Luckily I had been a member here a while & had learned that you need to lay the bike flat on its right side; then you can take the sprocket cover off without the engine oil all running out. First I took the battery out then did that and extracted the chewn up chain wear strip.





The chewn up wear strip is at the top. At the front is the one I made. On the left is the chain guide I also made which I will write about when it is completed.



I went to the local (good) Yamaha agent but felt the replacement was expensive & it would be some time before they could get me one as it is not something they had previously needed to supply. I am now retired but my last occupation was making industrial machine spare parts on a CNC machining centre I still have. I thus have the facilities for making a replacement. The original is some rubbery material. I decided to make mine out of UHMWPE



Ultra high molecular weight polyethylene (UHMWPE), also known as high-modulus polyethylene (HMPE) or high-performance polyethylene (HPPE), is a subset of the thermoplastic polyethylene. It has extremely long chains, with molecular weight numbering in the millions, usually between 2 and 6 million. The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions. This results in a very tough material, with the highest impact strength of any thermoplastic presently made. It is highly resistant to corrosive chemicals, with exception of oxidizing acids. It has extremely low moisture absorption, has a very low coefficient of friction, is self-lubricating, and is highly resistant to abrasion (15 times more resistant to abrasion than carbon steel). Its coefficient of friction is significantly lower than that of nylon and acetal, and is comparable to that of Teflon, but UHMWPE has better abrasion resistance than Teflon. It is odorless, tasteless, and nontoxic.
Source: http://en.wikipedia.org/wiki/UHMWPE



It is something I have used a lot in my business career.





Here it is fitted to the rear fork. Notice that I have changed the design so that it now goes right around the bearing tube so even if the screw falls out again it cannot come loose.
 

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Discussion Starter #5
Hello. The part you're looking for is on bikebandit.com the swingarm diagram part #14 on the picture.Same thing happened to me you've got to take the swingarm off to do it. I used an old handgaurd cut down n wrappred it around the swingarm in the areas that looked like they make contact. A cheap and quick fix so I can ride till colder weather and I'll replace it then.




Thanks for the confirmation. I suspected part #14 and will likely have to order one. In the meantime I like your quick fix idea which should allow me to ride pending delivery of the pricey chain wear strip. The post tok-tokkie provided looks like the ultimate set up and since he is retired hopefully he has cranked out a few extras to sell??



Thanks again!
 

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Discussion Starter #6
Thanks to all!!!!!!!!! The TW is a great bike, but the forum makes it really great especially since we are all short on the dollar these days. The brass at Yamaha should monitor this forum and with the feedback and upgrades noted; they could build an even better bike that would boost the bottom line at Yamaha.
 

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If you can wait three weeks, there is a cheaper Chinese version of this on ebay, I can't speak to the longevity since I just installed it. It does look and feel just like the factory one it replaced.

JOINT PROTECTEUR CHAIN SLIDER YAMAHA TW125 TW200 TW225 SLIDER | eBay


By the way tok-tokkie, nice fab job on your better than Yamaha grade replacement one you made. Impressive!
 
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The chewn up wear strip is at the top. At the front is the one I made. On the left is the chain guide I also made which I will write about when it is completed.


Here it is fitted to the rear fork. Notice that I have changed the design so that it now goes right around the bearing tube so even if the screw falls out again it cannot come loose.
@TOK-TOKKIE , do you happen to still have the CAD file for that larger guard? Id' like to try converting it to 3D Printing and see if I can print one. That is if you don't mind sharing it. No problem if not, I'm just really new to 3D Printing, so I'm not very good at designing things.
 
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