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Thread: Triumph Twin twinshock trials bike.

  1. #49
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    Nice! Love it. I've always had a thing for Trumpet Twin Trials.
    '06 HP2 E...................2006 - 2016
    '02 R1150 GS Adv........2004 - 2006
    '01 F650 GS Dakar.......2001 - 2004
    '91 R100 GS...............1995 - 1999
    '83 R80 G/S...............1986 - 1993
    '81 R80 G/S...............1982 - 1985

  2. #50
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    Every "little" job I start turns into a big one. Nothing fits exactly as you'd expect it to, but I suppose this is the fun of such a build.
    One such job was to connect the rocker oil feed pipe to the spur off the oil tank. A short length of hose had been on as a bodge, but immediately above the exhaust didn't bode well for longevity. The two pipe o/d's were slightly out, 5mm to 4.5mm, or the imperial equivalent. A 5mm compression fitting took up the slack and stopped me worrying.



    The new 54 tooth sprocket arrived from Talon. This is the biggest "off the shelf" sprocket they do for the Tiger Cub hub, but they will make anything you want. I hope I don't need anything bigger, this is huge! I cut another old length of chain to the right size and threaded it on. Seemed a bit stiff, just put it down to the newness (ahem) of the chain in question. It was only when I tried to put the split link on that I realised that it was an o-ring chain, and it was too wide to go through the gap between gearbox sprocket and the back of the clutch housing! And now it was in there, it was a b*st*rd to get out!
    Happily, I knew where there was another length, but it took nearly an hour to get.
    With this duly wrapped round the sprockets, a quick trip round the garden confirmed that the gearing is lower. Is it low enough? Ask me after the first trial!
    Next job, fit a chain guide. I bought a universal one from Sammy Miller, and using the old maxim of measure twice, cut once, made it fit.



    Next little job was to sort out an inner mudguard to fit below the main one to stop too much crud getting at the back of the engine. Part of ann old front MX guard did the job admirably. (the other part of the guard is the hugger on my GS)



    Another bodge fixed. The connector for the brake arm was turned down for me from an old clevis pin.



    And here's the set up with the chain guide, inner mudguard trimmed to fit, and a new chain!



    Getting closer. Just a few little jobs before it's maiden outing, our club trial on 11th June. Made a rash promise to have it ready for then!
    Mark
    Just when you've got this rat race licked, here come faster rats!

  3. #51
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    Would have gone along to witness the first outing Mark but i'm off down country.
    It does look the part, hope it does the job for you.

  4. #52
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    So, the little jobs. The chain tensioner still wasn't in the right place. A few washers spaced it out better. The front brake cable outer was shortened so that the piece of meccano could be jettisoned. The seals on the forks were leaking, so I stripped them down, emptied the sludge out of them, and refilled them with fresh oil. One leg has a slight bend to it, but as long as it is positioned correctly it doesn't cause too much of a problem. The awful carbon look stickers were binned, as were the concertina type fork boots. Some clubs insist on them if you enter the Pre 65 class, but I really don't like them. A pair of caps from a set of Montesa forks look so much better.
    Whilst fitting the front mudguard to the fork brace I realised that the bolts had distorted its curvature, so I undid it and rebolted it with a piece of hose underneath to give it shape. The last thing was to put the tank badges on. I wanted green ones, but now that I've done it, I think the red ones look just fine. On Saturday, after finishing some odd jobs for my Father, I threw the bike in the trailer and went to the yard to try it out.










    Unfortunately, the lowered gearing isn't low enough, and the carb jetting isn't rich enough, as the bike is too quick and too responsive. I could probably ride around one of the two, but not both. It would make a pretty good motocrosser as it stand at the moment!
    I took it to today's trial, but took the Cub to compete on. Parking it near the butty van drew a stream of compliments, and some ideas as to what could be done to calm it down a little. After the competition was done, I had a play around on it, and invited some of the more knowledgeable members of the club to try it and offer their opinions. The consensus appears to be that a smaller carb would help, as every other Twin is on a 622, whereas mine is a 626. Otherwise it was very well received, one of the experts blasting it through a section with ease, and proving that I may need to work rather more on my technique!
    A couple of people have offered to dig out a carb for me to try, so that will be the next little job.
    Just when you've got this rat race licked, here come faster rats!

  5. #53
    Well Mark was good enough to let me have a little spin on his beautiful Triumph at the weekend and have to say that unlike an online date, this bike is even better in the flesh!

    All pre 65 bikes only work because of the attention to detail and even though Mark was born after British bikes were the norm he's done a sterling job, I really can't wait to see him in action on it

    Since seeing it on Saturday I've been wracked with guilt about neglecting mine after my last dismal trial when my own bike was handling so badly I didn't finish.

    Started at 7am this morning and got stuck in with a full fork rebuild and much tweaking here and there, plus a good clean to finish off.

    Feels much better now, so thanks for the inspiration to sort mine

    KEA

  6. #54
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    This was the result of a call to Surrey Cycles, who supplied an Amal Premier 622, jetted to suit my intended riding. The bike is now a lot calmer, and throttle control is far smoother.
    Might just be able to compete on it now.....
    Mark
    Just when you've got this rat race licked, here come faster rats!

  7. #55
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    Just when you've got this rat race licked, here come faster rats!

  8. #56
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    As he mentioned, Tim came over to see the bike in the flesh. As I hadn't seen his 950 either we spent a long time talking and pointing.

    Just when you've got this rat race licked, here come faster rats!

  9. #57
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    A nice one from my local thumper trial
    <img src=http://www.ukgser.com/forums/images/smilies/motomartin.gif border=0 alt= title=Motomartin class=inlineimg />

  10. #58
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    Quote Originally Posted by peepingtom View Post
    A nice one from my local thumper trial
    I saw that one, or one very similar, on eBay a couple of years ago. That could have been the start of this odyssey!

    After the session at the stables with Tim, I washed the bike off and parked it up, as I was off to the Alps for a little over a week (more on that later).
    Another practice session on Saturday, with Denise's daughter Hannah, currently mad keen on trials, and I started to test the bike some more. Whether it was because I was getting more used to the handling, or getting less scared of it, I don't know, but I started to catch the odd splutter when I asked for the throttle. This wasn't ideal, as its debut was the next day!
    The first section was nerve wracking, as most of the riders were watching, but thankfully cleaned it! I had dropped down a class in honour of the new bike, so that was a nice confidence inspiring start. Kev Ellis stopped me on the way out of the section and tweaked the carb settings slightly, which helped. Mark Newman, another of the regulars, said he had a box of jets in his van, and we would have a play after the trial. Managed to stay clean until section 6, which had a tight uphill turn across a stream. I drifted a little too wide and ended up with a three. My fault entirely. Section 7 had a tricky turn along the edge of a gully, which played upon your nerve. I chose discretion, and another three. Cleaning the last 3 sections and my first lap on the Twin had only lost 6 marks. I was very pleased, but a bit disconcerted to note oil leaking from the bottom of one of the fork legs. Being used in anger certainly shows up any weaknesses! The rest of the trial was very enjoyable, the score went south with two 5's, one for stalling, and one for missing my footrest, but I did manage to clean the two sections I had earlier had 3's on.
    After the trial, good to his word, Mark Newman dug out his Amal box, and we had a fiddle. The setting I thought was already quite rich with a 120 main jet, he ended up increasing to a 150. This cured the hesitation just off idle, and in so doing smoothed out the jerky response. Looking forward to the next trial now, which is one of the Northern Brit Bike Championship rounds.
    Mark
    Just when you've got this rat race licked, here come faster rats!

  11. #59
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    Update.
    The Northern British Bike Championship is a seven round series of road trials, always well supported and with some fantastic riding. I had missed the first two, the 3rd I had ridden the Cub, the 4th was to be on the Twin. The West Riding Trial last year had ended in a deluge, but this year we had glorious conditions. I started badly, losing 9 marks over the first 4 sections, but then settled down and began to really enjoy myself. The front end was giving me cause for concern though, a common Pre 65 problem. Modern bikes have very stiff yokes and forks, giving excellent steering control. The forks I had on were wayward to say the least!



    My riding companion at that trial was Mark Newman, he who had helped with the jetting earlier. It was also he that had let me ride his Pre Unit Twin that I had been disappointed with a couple of years ago. He was very taken by the Drayton frame, and had been making some enquiries about getting one himself. The Maroon coloured bike from the show was for sale as a rolling chassis, the engine having let go in a big way. Mark did the deal and told me he was going to take his time and build it up with an engine he had found, probably as a project over the summer. Which is why he appeared on it not two weeks later!







    Mark
    Just when you've got this rat race licked, here come faster rats!

  12. #60
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    We swapped bikes a few times, trying to pin down the differences between the two. They were only slight, but mine had a smoother power delivery, whereas Mark's had much better forks.
    We were fairly well matched in the trial itself, until the start of the fourth lap. I had cleaned the section 3 times previously, but on this attempt my front wheel had clipped a rock and twisted sideways, pitching me over the bars. As the bike crashed down on its side behind me, there was a slight tinkling sound, which I found was the alloy shock collar off the left side rolling away down the section. I had snapped the end off the shock.



    Trial over I pushed it back to the trailer. There is a class for Air Cooled Monoshock trials bikes, but I didn't think it prudent to try and ride anymore that day.
    Slight panic though, as the next round of the NBBC was only a week away, with the Llangollen club round. Rockshocks are fully rebuildable though, and a couple of days later I had the repaired item back and ready to go on. The fall, or rather cause of the fall, had made my mind up though. I needed some new forks.
    JB had mentioned REH forks earlier, and a lot of other people besides. One of the experts at the Aqueduct club had gone to great lengths to explain the differences between the current new Pre 65 eligible forks on the market, and after trying the front end of his bike I was convinced. I ordered a set, to be collected at the Llangollen trial. I did ponder trying to fit them beforehand, but dismissed it as too much of a rush.
    Mark
    Just when you've got this rat race licked, here come faster rats!

  13. #61
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    The Llangollen trial is also on the same weekend as the Llanfest bike show, and one of the sections was to be in the arena of the show itself. There are 30 sections in total, but joined by some of the best green lanes the area has to offer, and was one of my favourite events of last year. This year didn't disappoint.
    Section 1, which I got through clean.



    Not sure what number this is, but I do know that it was a lot steeper than it looks. I ended up with a 3 after I got off line immediately after the photo!



    And this one was a 5. My front wheel should have been a foot further right (as I am on the bike) to make the left turn up the bank. It wasn't, and I didn't.



    This was the last section of the day, launching the bike out of the stream with too much throttle, I very nearly overcooked it!



    A great days riding. The new forks were ready to go in, and I had picked up a few ideas from various people at the trial for little tweaks to improve the bike still further.
    Mark
    Just when you've got this rat race licked, here come faster rats!

  14. #62
    Quote Originally Posted by earthmover View Post
    It wasn't, and I didn't.
    Brilliant

    Love this thread Mark
    KEA

  15. #63
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    I tried my mates C15 with his new REH forks last week and it steers/rides very well
    JohnnyBoxer



    So many roads...........So little time......

  16. #64
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    Quote Originally Posted by earthmover View Post
    Update.












    Mark
    Wow!
    How lovely are they?





    I mean the bikes . . . NOT the riders in case anyone gets the wrong idea!!

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