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Oopsie.
 

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It could possibly be made from an extension shaft for the reduction box on one of the quads. Could be a well-used one-off custom part or O.E.M. on some bike we haven't considered before. It's obviously machined to mate up with our support bearing.

Sure would be interesting to know. It would have to be an extremely perfect fit to work out over the long haul, but potentially a real game-changer.
 

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Cool. But (sorry to rain on the parade) it won't work for us. The TW countershaft has a full length drilling that supplies oil to our outrigger bearing. No other shaft has that oil feed. Simply tacking this to the end of a TTR/XT countershaft will cause our outrigger bearing to run dry. Not good.

Roy
 

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Cool. But (sorry to rain on the parade) it won't work for us. The TW countershaft has a full length drilling that supplies oil to our outrigger bearing. No other shaft has that oil feed. Simply tacking this to the end of a TTR/XT countershaft will cause our outrigger bearing to run dry. Not good.

Roy
Roy, what about if a machine shop drilled through it for the oil feed to the outer bearing? Anyone try this? This looked so promising...
 

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Discussion Starter · #8 ·
Thanks for share my interest. I found only picture, looks like used to exist for sale in Jpn or something. I have to dig it for more info.
Guess all of you guys know already, I like it gives us lot's benefit with less labor. I want to have more clutch capacity and 6th speed trans easy.

lizrdbrth: I still don't know what is this piece from and Yes, this piece must need accurate and strong material made. Hopefully, I can get some more lead.

Roy & littletommy: It may need some modified for lubrication to outrigger bearing like you said. That sounds easier than all motor parts swapping. Maybe grease do enough job for that part, it just my lazy idea. I want to try first and see how it works.
 

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The countershafts are hardened to somewhere around rockwell 60 (don't know actual number) after original machining. The machinist needed to use a die grinder with a super thin disc to machine in a mere snap ring groove. Grinding, not drilling.

I just took one more look at the XT shaft (identical to the TTR shaft) to make sure. On the opposite end (clutch side) there is a plug capping the drilling. Oil is fed into the shaft via a case oil gallery and a side drilling in the shaft. Oil exits the shaft at several locations along it's length to lubricate gears. On the sprocket end, it's a blind hole where the lathe centered the shaft. It would have been a small detail, but I would have liked to drill an extra oil hole in the TW shaft for the 6 speed. Machinist said "impossible".

Tumbleweed, Yamaha thought there was enough load on that bearing to give it positive oil feed and flow. They could have simply used a sealed bearing. I think the length of the shaft out from the engine- and the tension of the pulling chain- would yield a pretty large bending moment on the shaft.

I didn't think the engine work was hard at all. Parts and process could be streamlined fairly easily. Took roughly 10 hours to assemble, remove original engine from bike, install new engine. Wouldn't hesitate to do it again.

Roy
 

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Discussion Starter · #10 ·
Hi, I understand what Roy wrote. that is ideal way, one piece shaft is best. And I'd rather have more oil feed but I'm fine if TTR running OK. We can enjoy TW many way and own purpose so, I just like this parts idea. Also doesn't matter to me about oil or grease lubrication for bearing. It's last century design motor, we can see some engine parts Yamaha should improve but they won't. They quit and released another bike like XT250. That's fine and that's why we have space for touch and mess something for joy. Hope you enjoy your TW.

I don't have any leads yet. will keep search. Thanks!
 

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Discussion Starter · #13 ·
I received reply yesterday. He wanted to re-make that parts acutually so, he was try to ask lot's metal work shops but couldn't get good answer.
Sounds me like all shop want to take too big amount of order.
 

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BUMP
Seems way back in 2013, this part already existed but was shut down because everyone seemed to think the bearing would not hold up without oil.
Yamaha thought there was enough load on that bearing to give it positive oil feed and flow. They could have simply used a sealed bearing. I think the length of the shaft out from the engine- and the tension of the pulling chain- would yield a pretty large bending moment on the shaft.
I thought it was an interesting read and is the earliest 225 mod of this type posted.
 

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Interesting find, Jerry! I had not seen this before.

Vagabond helped me to understand what was needed for my first TW225 6-speed conversion using the modified TW output shaft approach. I believe that he and Lizrdbrth were the first two to have pioneered their 6-speed TW's using that method!
 

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Interesting how no one back then proposed a sealed bearing, which is what we use today with PlacerLode's extension.
 

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Interesting how no one back then proposed a sealed bearing, which is what we use today with PlacerLode's extension.
The quote from vagabond in my post did mention it, suggesting the option must have been weighted by Yamaha as insufficient. I figure that killed the whole notion for a while.
 

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I had not seen this thread I love that Russ aka Lizrdbrth saw the potential of this part from the very beginning! no surprise to any who knew him !

The original designer had 6 made (I bought 2) and offered to farm them out for testing as he didn't have much time to ride his personal conversion up in Oregon

at the time they were $300 and yet unproven but in talking with the designer I found they were extremely well researched by him and his team including running grease packed factory roller bearings with a sealed bearing as an option and all that was needed was field testing from prolific rider(s)

PS the originals had a slightly rough exterior finish almost looking like they could have been 3D printed - the one in the pic was probably one of the original units used for testing although I'm not sure why it's out of the bike unless it was for inspection purposes which is highly possible as the original designer really wanted them to be proven before making any more
 

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I had not seen this thread I love that Russ aka Lizrdbrth saw the potential of this part from the very beginning! no surprise to any who knew him !

The original designer had 6 made (I bought 2) and offered to farm them out for testing as he didn't have much time to ride his personal conversion up in Oregon

at the time they were $300 and yet unproven but in talking with the designer I found they were extremely well researched by him and his team including running grease packed factory roller bearings with a sealed bearing as an option and all that was needed was field testing from prolific rider(s)

PS the originals had a slightly rough exterior finish almost looking like they could have been 3D printed - the one in the pic was probably one of the original units used for testing although I'm not sure why it's out of the bike unless it was for inspection purposes which is highly possible as the original designer really wanted them to be proven before making any more
I'm glad you took this up and ran with it! We just did not have the ability to put a lot of miles on these for testing as we ride off road almost exclusely. Those of you who met Glen in Moab on the Slickrock this spring met the machinist who designed/machined the original six extensions. His TW is using the one of the those original extensions with no issues so far...
 
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