Street Twin lost downshifting, bent internal shift mechanism DIY walk-through - Page 8 - Triumph Forum: Triumph Rat Motorcycle Forums
Water Cooled Twins Technical Talk Technical Talk for water cooled Triumph Twins.

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post #71 of 104 (permalink) Old 02-13-2019, 07:11 PM
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@Simon64ds indeed a terrific bike... but any comment on the exhibits?

rock & roll baby

been there, done that.
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post #72 of 104 (permalink) Old 02-13-2019, 07:47 PM
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Feel free to message me if I was not clear in the above description.
I now see what you are talking about. I also now understand your math. What hung me up is that I have never seen anyone express pi as (22/7). Interesting way to remember a value fairly close to pi.
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post #73 of 104 (permalink) Old 02-13-2019, 08:38 PM
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22/7 is a close representation of pi.

https://www.quora.com/Why-do-we-use-22-7-for-pi

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post #74 of 104 (permalink) Old 02-14-2019, 03:29 AM
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@Simon64ds indeed a terrific bike... but any comment on the exhibits?

rock & roll baby
You mean do I have any comments on your photo?

Sure I do. You crashed your bike and it sustained damage.

Do I think the factory deliberately ‘engineered’ the shifter assembly to be sacrificial in a crash? No, sorry, I don’t. I think that when designing, from a clean sheet of paper to create a brand new engine, what happens when the owner falls off it is a long way from the desiigner’s mind.
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post #75 of 104 (permalink) Old 02-14-2019, 06:16 AM
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But surely the standard seal buts up against a lip cast into the cover? In other words it is ‘positively located’ into it? I would love to see a close up view of the inside of the clutch cover.

Anyway, as a precaution that I’m wrong (wouldn’t be the first time I can promise you) I have now fitted a Mk2 version of the delrin spacer. No bloody way is that shift shaft being knocked inwards now.

Here ya go, the one still has the washer stuck to the bearing/seal. Lots of thickness there.
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post #76 of 104 (permalink) Old 02-14-2019, 07:11 AM
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I ended up using what I have in the garage and that was washers.
I put two 28mm/14 followed by one 23/12.
My washers are a bit thicker.


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post #77 of 104 (permalink) Old 02-14-2019, 09:19 AM
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Looks as if you have two big washers and two smaller washers. No matter. Use whatever you have and whatever works. Ideally you would want a close fit that still allows free movement of the shift lever. Do double check your clearances when the engine is hot as metal expands when heated.
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post #78 of 104 (permalink) Old 02-14-2019, 10:05 AM
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Originally Posted by Simon64ds View Post
You mean do I have any comments on your photo?



Sure I do. You crashed your bike and it sustained damage.



Do I think the factory deliberately ‘engineered’ the shifter assembly to be sacrificial in a crash? No, sorry, I don’t. I think that when designing, from a clean sheet of paper to create a brand new engine, what happens when the owner falls off it is a long way from the desiigner’s mind.
no. i mean on the exhibits. have you seen videos of motorcycles "standing up" after crashes?
most of the experience i read here is from a tip over on the garage/mellow cruising and how to avoid a "costly" repair. lets pretend there could be a reason on why this is designed this way apart from negligence. i think it would enrich the thread.

rock & roll baby

been there, done that.

Last edited by cosmetik; 02-14-2019 at 04:55 PM.
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post #79 of 104 (permalink) Old 02-15-2019, 11:14 AM
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The dimensions I have are 14mm internal diameter, 25 mm external diameter and 6 mm thickness.

Guys, I do not claim that these are the ‘best’ sizes (and they’re certainly not the ‘only’ sizes) but they’re what I ended up with.

We used an off-cut of delrin bar that was kicking around (the engineers - which I am emphatically not - used it for making gears as a ‘day job’ before the business closed). Now the workshop is turned over to race bikes (which has the added attraction of not spending too much time with the wives.. ).
Thanks for the specs on the delrin washer. I ordered enough delrin bar knowing that using hand tools and a drill I wouldn't get the accuracy on the first attempt but I got there in the end. Here's some pics.
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post #80 of 104 (permalink) Old 02-15-2019, 12:07 PM Thread Starter
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Thanks for the specs on the delrin washer. I ordered enough delrin bar knowing that using hand tools and a drill I wouldn't get the accuracy on the first attempt but I got there in the end. Here's some pics.
Nice job! That's exactly what I'll be doing with my Delrin rod order arrives.
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