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nab301 said :-
My only experience with a dodgy TPS was on a fuel injected Guzzi , the throttle was a little snatchy and checking the resistance "curve " of the TPS with an ohmmeter proved it wasn't very progressive , as an experiment I started the bike with the TPS disconnected and like Glyn the engine barely ran except on full throttle . The original problem was cured with a new TPS although unlike a carbed engine there must be more at play than just ign timing?
Nigel
05/03/2026 15:06:15 UTC
Ian Soady¹ said :-
My parts are now in Frankfurt apparently but one their way to me. When I look at the carb there doesn't seem any way the cable operated chioke can fit along with the TPS as there's only clearance (just) for the shaft of the carb-mounted choke button. I think I'll have to chop one leg of both the bracket and sensor off to get it to fit. But will wait till I get the bits. Always something isn't there? The carb is humongous and incredibly complicated but apparently releases another few bhp over the CV Mikuni which is standard fit on the softer models.
I've just heard that the sidecar body & mudguard are finished so have arranged for them to be picked up tomorrow morning. How exciting!
06/03/2026 11:05:53 UTC
Glyn said :-
I can’t wait for the pictures Ian. I’ve been busy myself on the Trumper Triple. The main issue being the “stuck” clutch that would not release. It was an easy job to get it out and find the metal and friction plates glued together with gloopy old oil. Just a quick clean up of the metal plates with metal polish and all is well. I had to make a new cover gasket as £30 for a genuine item seemed a bit steep.
06/03/2026 18:40:49 UTC
Glyn said :-
All back together on the engine now and stainless fasteners making it look much better. I’ve bought a new battery and just have to do the Kreem tank sealer job to keep the rust at bay. The MOT is booked for 2nd April.
06/03/2026 18:44:39 UTC
Ian Soady¹ said :-
Ah, the almost lost art of gasket making. Did you use a cornflake packet or the proper stuff? I have sheets of the latter - can't remember the name - which are decades old. I must admit to often using RTV except where bits might get into the oiling system these days. Primary drive covers on my old bikes are notoriously difficult to seal otherwise.
07/03/2026 09:38:22 UTC
Ian Soady¹ said :-
Quick pic of the painted body and mudguard. The paint shop (Lee at Painttech in Bromsgrove - see link) has done a really nice job and the colour match to the bike is just about perfect. I'm leaving it for a week or so to fully harden before applying the chrome strips, tonneau clips etc.
Cost £675 which sounds a lot but given the work involved I think was very reasonable, as was the £40 each way transport by a local man & van. Shiply and anyvan wanted over £150 to take it about 10 miles which is about what I paid to have the whole lot brought from Wisbech to Redditch. And that by a proper bike removal bloke (Phil from Acceleration) who really knows his stuff.
https://painttechrepairs.co.uk/...
07/03/2026 12:16:35 UTC
Ren - The Ed¹ said :-
Well for a fella with a dicky knee you're doing some excellent work there Glyn. Colour me impressed.
By golly that's very very red Ian. I have little sense of colour but I'm thinking the chrome trims and black frame will reel it in nicely.
07/03/2026 17:44:30 UTC
Upt'North ¹ said :-
Nice work fellas, I've cancelled the callback from MI5....at first I thought it was a Shahed.
07/03/2026 17:50:58 UTC
Glyn said :-
Looking very good Ian. I’m always worried about new paint and I struggle to let it harden wanting to get it together as soon as possible. It takes a fair bit of willpower to leave it. I bought the proper gasket material some years ago and still have lots left.
07/03/2026 20:10:04 UTC
nab301 said :-
Ian , hopefully it handles as well as it looks and if it ends up as a wet summer you can always make a canoe out of it and paddle around in the floods.
@ Glyn , the Triumph has cleaned up well , it'll be interesting to hear your verdict on it when you get the MOT
Nigel
09/03/2026 15:45:07 UTC
Ian Soady¹ said :-
Oh bu99er. The adaptor for the TPS arrived yesterday with the cable operated choke. In my enthusiasm opening up the packages the little adaptor, which is only a few mm diameter disappeared probably into the black hole that has taken up residence under the bench. I've looked for it but no success so far so I made the choke cable instead. I'll have another search later.
However I have verified that the TPS and its mounting plate do indeed interfere with the choke housing so will need to modify them. I may try it with my home made cap first of all although my knee is still giving me gyp so should really rest it. How can I rest with all this work to do?
10/03/2026 10:13:12 UTC
Upt'North ¹ said :-
Genesis 2:2-3, God rested on the seventh day after finishing the work of creation, TPS assembly, blessing and sanctifying it as a holy day. No mention of knees I'm afraid. But I'll try, raise up Ian and be healed for you are blessed. No?
I can guarantee that little widget is with my 10 mm socket.
Pffffffftttttt.
Upt.
10/03/2026 10:55:31 UTC
Ian Soady¹ said :-
God may have rested but being wicked there's none for me. Screwed it all back together with my home made blanking cap and miracle of miracles it started well and seems to run OK. The choke is much better with the cable as it can easily be positioned mid way and is easy to adjust in flight. It will be a while before the road test as it needs the chair body fitting after its repose in the shed. I did find a 4mm cobalt drill under the bench but no sign of that adaptor.
10/03/2026 11:57:14 UTC
Glyn said :-
I’ve just used the Kreem tank liner kit on the Triumph. It took me a long time to decide to take this route as there is some negative feedback about liners if you research them. The Triumph had the original factory silicon liner break up and break off into what looked like brown leaves. I did get it mostly clean with electrolysis but it had started to flash rust. Further reading seemed to suggest that most motorcycle tanks are being ruined by Ethanol additives. The fuel absorbs water and this starts to rust any untreated metal tanks. Is this true? I’m not sure but most bikes I buy, that have not had frequent use, do seem to have damage. So I bought a kit (£49) and proceeded with the fairly complicated and lengthy process of cleaning and coating. It all went as described and I now have a white film covering the interior of the tank. I allowed some of the product to “cure” on an old metal plate and it’s gone as hard as rock in 24 hrs. I guess time will tell but, if it does stick as advertised, then I won’t get the jets clogged with debris from the tank. I’ve fitted extra filters in the two hose feeds to help.
12/03/2026 08:56:05 UTC
Ian Soady¹ said :-
I'm afraid I don't subscribe to the "ethanol ruins tanks" view. Yes, ethanol does have a small hydroscopic effect but that would actually absorb any water vapour and hold it in suspension. And how much water vapour is available above the petrol level anyway? I did a small experiment some years ago in which I submerged carburettor parts in a jamjar of E10 for several months. The parts were completely unaffected. See photo.
The diminishing number of older folk who remember the 1950s and 60s may recollect Cleveland Discol. It was up to 20% ethanol, which was provided as an alternative to ethyl lead by Distillers' Company. There were, as far as I know, no reports of any damage. My dad for one swore by it.
Of course some "rubber" materials don't stand up well to ethanol.
12/03/2026 10:12:40 UTC
Ian Soady¹ said :-
Later I added some water which just sat at the bottom of the jamjar and left it for a few more months. This was the result. So yes, water is a problem but it has nothing to do with ethanol. Of copurse the environmental benefits of ethanol are dubious in the extreme unless it's made using waste organic material rather than food crops.
12/03/2026 10:13:09 UTC
Ren - The Ed¹ said :-
It's hard for me to form an opinion - because I've never had a tank go rusty on me - because I've always been using my bikes which means a constant steady replenishment of fuel in the tank. Rust appears to only be an issue if the tank is stood for a good length of time (with or without fuel).
12/03/2026 14:35:29 UTC
Ian Soady¹ said :-
For my own part I've never had a problem even after leaving petrol in for 6 months or so. Maybe it's my ambient temperature (read cold) garage?
12/03/2026 15:34:03 UTC
Glyn said :-
There was still some small pieces of the silicon liner in the tank so I’m hoping that the Kreem liner will hold it in place. It seems I may have wasted £49 if I only intended to coat and prevent further rusting. The inside of the tank was in a terrible state when I started.
13/03/2026 16:11:40 UTC
Glyn said :-
There was still some small pieces of the silicon liner in the tank so I’m hoping that the Kreem liner will hold it in place. It seems I may have wasted £49 if I only intended to coat and prevent further rusting. The inside of the tank was in a terrible state when I started.
13/03/2026 16:11:41 UTC
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