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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-12-2012, 02:00 PM   #1 (permalink)
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Thruxton 900 Gear Change Issues

Hi.

Not sure if anybody has had similar experience of this, I would love to hear if someone has.

I have very recently bought a Thruxton 900 2012 new.

Soon after I collected it from the dealer, I noticed I was having difficulty going 'down' the box, from 3rd to 2nd to 1st.

When I say 'difficulty' I mean that when you push on the pedal, it feels like the gear change selector mechanism is coming un-attached from whatever it is it engages with in the gearbox.....there is a clicking sensation (as if something is slipping or coming unengaged), and the pedal does nothing (it goes up and down, but doesn't change the gear down, the bike remains in the gear it was in before I tried to change). If it is depressed again and again (sometimes it takes up to five times) it will eventually connect inside the box, and change down the gear. If you let the clutch out again, it is still in the same gear as when you tried to change it.

If the symptom appears, and you leave the clutch out, and apply throttle, the pedal will still move until eventually it 'clicks in' and will not move until the clutch is pulled in. It will then change gear.

I mentioned it to the dealer, and they have admitted there is a problem, however, at first they had to make sure it wasn't me causing it, and I had the bike recovered to them, so they could have a look. The mechanic said it may clear after time, but if it was wrong at the first service interval (which I have just hit), then they would take another look when they serviced it. I will be running it in for its first service saturday, so I will get them to keep it in to investigate.

They have tried adjusting the clutch, and at first it seemed to help, but then the symptoms returned (on the same day), although there seems to be a worsening of the symptoms when the engine is hotter (i.e. it is better when you first ride it, the condition deteriorates as the bike warms up to its normal operating temperature).

I get the sneaky suspicion it is to do with the gear selector mechanism or part thereof, and I happened to read an article on here about a street triple that it happened to. I am assuming, as with most gearboxes, that the mechanics must be similar.

Any thoughts anybody please? Would be most appreciated.

Thanks
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Old 11-12-2012, 02:22 PM   #2 (permalink)
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I would say nothing to do with the clutch ......Selector problem a broken spring somthing like that......You need the great Forcetto.....
T.U.D.
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Old 11-12-2012, 03:31 PM   #3 (permalink)
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Likely you have a damaged shifter mechanism -- the shaft which the gear change lever attaches to -- I damaged mine after a low speed drop which bent the lever. In the course of trying to bend it back straight so I could ride home, I snapped a gear tooth off of the internal shaft. Had the dealer fix it: replacement shaft is not expensive, but labor is, as the bottom casing had to be taken off to find the chipped off piece of metal, the oil and filter had to be changed for fear of contamination by metal filings. Total cost: $600 and change...
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Old 11-13-2012, 12:45 AM   #4 (permalink)
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Quote:
Originally Posted by tonupdave View Post
I would say nothing to do with the clutch ......Selector problem a broken spring somthing like that......You need the great Forcetto.....
T.U.D.
Thanks Dave, the Haynes I bought mentioned a stretched spring (there are 2 in the selector mechanism) as a possible problem.

I am only assuming this occured during engine assembly, as the bike has been like it from new, and I also agree it is not the clutch.
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Old 11-13-2012, 12:52 AM   #5 (permalink)
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Quote:
Originally Posted by Oldcase View Post
Likely you have a damaged shifter mechanism -- the shaft which the gear change lever attaches to -- I damaged mine after a low speed drop which bent the lever. In the course of trying to bend it back straight so I could ride home, I snapped a gear tooth off of the internal shaft. Had the dealer fix it: replacement shaft is not expensive, but labor is, as the bottom casing had to be taken off to find the chipped off piece of metal, the oil and filter had to be changed for fear of contamination by metal filings. Total cost: $600 and change...
Thanks for that Oldcase. I haven't dropped it, this problem has been there since I first collected the bike from new, and I am looking at the dealer fixing it under the Warranty.

I agree it is some faulty gear-change component, but which one, thats what I'd like to know!!!

I will have to wait till the dealer strips it apart to find out! Having read the Haynes I have discovered it is a clutch-off job to get to the mechanism, as it is behind an inspection plate, behind the clutch.

This is quite disturbing, as it means dismantling a new engine, something I am not really comfortable with. I am sure my dealer will do a good job, but I am still a bit miffed this has occurred. Still, I suspect I am not the first, and 's!*t happens', as they say.....

Last edited by Hotboppincat; 11-13-2012 at 12:59 AM.
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Old 11-13-2012, 12:55 AM   #6 (permalink)
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Quote:
Originally Posted by tonupdave View Post
......You need the great Forcetto.....
T.U.D.
Is Forcetto a 'Gear-Box Guru'?
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Old 11-13-2012, 12:59 AM   #7 (permalink)
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Is Forcetto a 'Gear-Box Guru'?
No...
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Old 11-13-2012, 09:00 AM   #8 (permalink)
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Take it back to the dealer and insist he sorts it out It is obviously an assembly fault what did they do in adjusting the clutch? make sure the mechanic knows what you are talking about I don't know what your dealer is like but if mine is any thing to go by they are only interested in selling you goodies or coffee You have paid your money the goods should be right Good luck and let us know how you got on
T.U.D.
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Old 11-14-2012, 12:58 AM   #9 (permalink)
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Cheers Dave, the Dealer is taking her back on Saturday, they have already agreed there is a problem, although it was a struggle to get them to understand the nature of the fault initially.

In the first instance they wanted to eliminate the possibility of (1) it was me, not changeing gear correctly (I have been riding bikes for the last 30 years, although this is my first Triumph, and haven't come across this in a new gearbox before, but I have experienced it on older machines!), and (2) whether it was caused by clutch drag, although I tend to think that would make the gearbox drag and be less likely for the pedal to move easily.

The problem was, that at the time I reported it to them, it was a lot more intermittent than it is now. It really shows itself up on a longer run, the main problem the technicians have is having the time to fully test the vehicle and experience it for themselves.

The main reason I posted was to find out if anybody else had experienced the problem, and the likely cause.

I think its possibly the selector centralising spring, possibly stretched on assembly. The Haynes manual mentions this, and as the spring works in 2 directions (up and down the box), and the problem is only when shifting down the gears, I would like to hazard a guess that either one of the prongs has been stretched, or it hasn't been put on right.

Possibly!!!

Kev
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Old 11-14-2012, 01:27 PM   #10 (permalink)
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Interesting.. I've just bought a Thrux and had similar issues changing down through the lower gears. I'd wondered if it was just me getting used to the rear sets or new bike syndrome. I'll get out over the weekend and have a proper look at it. I rather suspect it's an adjustment issue with the extended levers?
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