Street Twin lost downshifting, bent internal shift mechanism DIY walk-through - Page 9 - Triumph Forum: Triumph Rat Motorcycle Forums
Water Cooled Twins Technical Talk Technical Talk for water cooled Triumph Twins.

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post #81 of 104 (permalink) Old 02-15-2019, 01:12 PM
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Originally Posted by cosmetik View Post
lets pretend there could be a reason on why this is designed this way apart from negligence.
OK, let’s pretend that.
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post #82 of 104 (permalink) Old 02-15-2019, 01:25 PM
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OK, let’s pretend that.
my meaning is to elaborate something on the why its designed this way. You and some others have a lot of experience with engines and cycles. After all this is the "Technical Talk" part of the forum and we could use your experience on more than discussing the size of a metal rod or washers ad nauseam. Stating this, if i would do the protection, i would use a material like nylamid or cold-roll that could disperse the shock in a tip over, but when a stronger force would act (crash) it would be crushed allowing to work as my design-hypothesis post #68

been there, done that.

Last edited by cosmetik; 02-15-2019 at 01:34 PM. Reason: improve
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post #83 of 104 (permalink) Old 02-15-2019, 02:47 PM
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A damaged Hinckley Triumph shift shaft is not a new problem. Take a look at my post #15 showing shift shaft end thrust resisting washers to bridge over the oil seal, a sawcut about halfway through the shift arm and cross-drilled holes through the shift lever footpad bolt to weaken the lever etc. with the intention of breaking outside before something breaks inside. If the pad bolt or the lever end breaks off then there is enough lever left to shift gears.

https://www.triumphrat.net/club-cafe...se-call-2.html
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post #84 of 104 (permalink) Old 02-15-2019, 05:33 PM
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Originally Posted by cosmetik View Post
my meaning is to elaborate something on the why its designed this way. You and some others have a lot of experience with engines and cycles. After all this is the "Technical Talk" part of the forum and we could use your experience on more than discussing the size of a metal rod or washers ad nauseam.
Ah, I see. I didn’t really understand, sorry. The problem is, we can only guess at why anything is designed the way it is. Why was the shifter designed like that? Why was the 900 artificially restricted to well below it’s actual potential? Why use ‘this’ material and not a stronger/lighter/more durable one? Why? Why? Why?

The truth is - no one knows. We can all make guesses and theories to ‘justify’ things, but they’re only guesses and theories. The only people who actually know are the design team - and they’re not telling!

Indeed some times the factory actually sets out to mislead the public by failing to disclose material facts. Like the ‘new’ more powerful 900 where they’re trying to infer that they haven’t fitted a different camshaft for instance, when they most certainly have. Presumably because they don’t want people joking that they went out and bought a stack of TEC cams!

I hope you get your bike fixed up OK, stay safe.
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post #85 of 104 (permalink) Old 02-15-2019, 10:20 PM
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Ah, I see. I didn’t really understand, sorry. The problem is, we can only guess at why anything is designed the way it is. Why was the shifter designed like that?

The truth is - no one knows. We can all make guesses and theories to ‘justify’ things, but they’re only guesses and theories. The only people who actually know are the design team - and they’re not telling!
It would be so good if someone in Triumph's design/R & D department would reply to problems with Triumphs in customers' hands to explain things such as the shift mechanism fragility during a left side tipover dating back to at least 2007, the fragility of an early Hinckley Bonneville starter intermediate shaft bearing boss, and occasional Bonneville footpeg bolt breakage and why they do not respond in an energetic manner to these design weaknesses. They should certainly know that this site exists.

Fortunately, work can be done by owners to prevent the above-described weaknesses from making a failure.
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post #86 of 104 (permalink) Old 02-16-2019, 01:34 AM
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Just think if dirt bikes had shift mechanisms this fragile! I have done far more than minor tip overs directly on the shift lever, even bent the lever around 90 degrees with no damage to the internals. Maybe Triumph should buy a dirt bike and tear one apart to see what they do differently.
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post #87 of 104 (permalink) Old 02-16-2019, 04:33 AM
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Originally Posted by Simon64ds View Post

Indeed some times the factory actually sets out to mislead the public by failing to disclose material facts. Like the ‘new’ more powerful 900 where they’re trying to infer that they haven’t fitted a different camshaft for instance, when they most certainly have. Presumably because they don’t want people joking that they went out and bought a stack of TEC cams!
I disagree I don't believe Triumph have fitted a new cam in the 900s.
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post #88 of 104 (permalink) Old 02-16-2019, 04:37 AM
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Originally Posted by cougsfan View Post
Just think if dirt bikes had shift mechanisms this fragile! I have done far more than minor tip overs directly on the shift lever, even bent the lever around 90 degrees with no damage to the internals. Maybe Triumph should buy a dirt bike and tear one apart to see what they do differently.
These bikes are primarily ridden by guys in dandy suits larping some non existent past i dont think triumph saw the need to engineer them.for hard use?
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post #89 of 104 (permalink) Old 02-16-2019, 09:00 AM
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I disagree I don't believe Triumph have fitted a new cam in the 900s.
Fair enough. I expect the truth will be revealed in the fullness of time. Meanwhile it’s not keeping me awake at nights..
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post #90 of 104 (permalink) Old 02-23-2019, 07:51 AM
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