Featured New Project Gt

Discussion in 'Builds & Projects' started by Mark9, Jun 11, 2021.

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  1. Mark9

    Mark9 Senior Member
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    Jul 13, 2020
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    I’m picking this German import GT250A tomorrow, I had a 250A when I was 17 so it’s a nostalgia trip!, note the German market rear mudguard and incorrect GT380 front mudguard, apart from that it appears to be relatively untouched, I’m not going to do a rivet count though, just get it tidy & rideable.
    D5A8D0BD-F377-4D8A-9568-95839C37262A.png
     
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  2. Yorkshireman

    Yorkshireman Crème de la Crème

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    Looks nice enough Mark, hope you have fun with it. I had an X7 and my cousin had a GT250 of about that age, we were for ever stripping them down for one reason or another and moved onto a 380 and 550 respectively. We łearned a lot about two strokes and bikes in general. The 380 front mudguard was for a 19 inch wheel if I remember correctly. Which brings back a funny story. My cousin took his 380 for an MOT and it failed on the front tyre but being skint he couldn’t afford a new tyre so he borrowed the front wheel off his mates 250 which fitted fine but the brake disc was different, possibly smaller. Anyway he got a pass but if the tester had checked the front brake it wouldn’t have worked so well.
     
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  3. Mark9

    Mark9 Senior Member
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    Ha, yes I remember those days, people cutting tread into bald tyres with soldering irons etc, we were poor but happy!, yes if it is a GT380 it’s for a 19 inch, I’ll try to source the correct mudguard at some point, but like anything to do with 2 strokes I get the feeling it won’t come cheap!
     
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  4. Mark9

    Mark9 Senior Member
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    Well picked it up today and so far so good, engine mechanically quiet, starts first kick, nice tick over, forks are leaking but that’s par for the course!, found two tiny breaks in the chrome on the stanchions so they will be the cause, I’ll repair temporarily with araldite and smooth them over, fit new seals, then over winter I’ll send them to be rechromed, no nasty surprises so far but I’m sure there will be :)
     
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  5. Mark9

    Mark9 Senior Member
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    Snags so far;
    Clutch dragging so much it stalled the engine when put into first gear
    Fix- Pushed the bike up and down the driveway a couple of times pulling the clutch in and out, eventually it freed off, doesn’t drag at all now, I have now oiled/greased the clutchactuator, oiled the clutch cable, changed the engine oil, the clutch now seems good (but I’ve only ridden in 1st on the driveway so far).

    Front brake light switch not working.
    Fix- disassembled the switch,removed 40 plus years of crud, made a new bridging contact, now works fine.

    Clutch lever clamp bolt broken
    Fix- fitted new clamp bolt

    Engine very smoky on startup.
    Fix- 2 stroke oil in CCI tank siphoned out, a clear thin oil, might’ve been 2 stroke oil, might’ve been 3 in one! :), I replaced it with Silkolene oil designed for CCI, now much less Smokey, not sure if the oil check valve for the RH cylinder is sticking a bit though, still seems to smoke a little too much on the RH exhaust on startup, it soon clears so I’ll leave that until it’s been run on the Silkolene for a while and see what happens.

    Left rear indicator bulb blown
    Fix- replaced bulb.

    Indicator switch, the bit you presswas missing
    Fix- made one out of a lump of black nylon, need to source an original item

    Loads to do but so far no nasty surprises, not saying there won’t be any!
     
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  6. Ducatitotriumph

    Ducatitotriumph Crème de la Crème
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    Tbh, sounds like fun so far!!!!!
    As long as the engine goes around, the rest is enjoyable!
     
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  7. Davie_M

    Davie_M Active Member

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    More smoke on rhs could be the crank seal keep an eye on the gearbox oil level
     
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  8. Mark9

    Mark9 Senior Member
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    It could be Dave , I’m hoping not of course because that’s more work, it smells/looks like 2 stroke smoke & clears after the first minute of running so with any luck will be the oil line check valve for that cylinder allowing 2 stroke oil through overnight, but it certainly could be either!
     
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  9. Mark9

    Mark9 Senior Member
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    Today’s improvement was to fit a sidestand, it was killing me lifting it onto the centre stand!, designed before they invented the “step on lever”, couldn’t find a GT250A one so took a punt on a cheap GS750 one , fits perfectly!
    Also I took it for a quick 1st and second gear ride on a “private road”, the smoke has cleared up, must’ve been all the starts & running on tick over that was causing a buildup of 2 stroke oil, anyway a successful day, now she’s in the garage having a rest.
    [​IMG]

    PS the wooden blocks are there to keep it upright, it gives me more space to walk past in the garage.
     
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  10. Hippo-Drones

    Hippo-Drones Noble Member

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    Ahh awesome project bike :) congrats :)
     
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  11. Mark9

    Mark9 Senior Member
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    The front brake was dragging a bit, so I disassembled the calliper, sliders ok, pumped the piston out a bit, looked good, then it wouldn’t push back in again!, put a clamp across it, felt hydraulically locked, this must be a master cylinder issue I thought, anyway I undid the bleed nipple, pushed the piston back, then bled the system, now it works perfectly, my best guess is there was a blockage in the oil return in the master cylinder that was dislodged when I bled it,anyway it works now so that’ll do!.
     
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  12. Dawsy

    Dawsy Cumbrian half-wit
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    What a lot of fun this type of bike were. I had a KH250 and it was an absolute scream despite the middle carb falling off at times :grinning:
     
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  13. Yorkshireman

    Yorkshireman Crème de la Crème

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    Glad it wasn’t only me who had middle cylinder issues, mine was an (almost) constant misfire despite gallons of WD 40 and NGK plug caps. :(
     
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  14. Mark9

    Mark9 Senior Member
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    Today’s improvement was to put the battery on charge :), I’ve checked the charging system with a multi meter and it works (on a 45 year old selenium rectifier), but I’m not riding it so giving it a boost.
     
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  15. Mark9

    Mark9 Senior Member
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    #15 Mark9, Jun 19, 2021
    Last edited: Jun 19, 2021
    I like to start with “today’s improvement” but today it’s “today’s bodge”, a temporary repair to the fork stanchions before sending away for rechroming in the winter, I’m fitting new seals tomorrow so that I can get it MOT’d in a few weeks time.
    Several pits in the chrome which have sliced the seals causing the forks to leak.

    Fix - Go over the edges of the pits with a fine oil stone, and then 1800 grit Emery paper, then 2000 grit to smooth the edges.
    Degrease with carb cleaner.
    Mask off then apply Araldite, smooth down with 1800 grit then 2000 grit.
    The end result is visible but absolutely smooth, it’s impossible to feel the repair once it’s smoothed so the new seals when fitted should be fine, here’s all the right photos, not necessarily in the right order.

    75DE5C43-0949-4099-A344-9BA3E6827694.jpeg
    47401022-13D5-4A31-9FF9-F9779657C45D.jpeg 89E20E41-3901-4C24-B906-FC7195317006.jpeg 49347AA9-9BEA-4C13-AC43-B1DDDD00424D.jpeg 69B3B490-BA77-4A57-9526-BAC025C1F5FA.jpeg
    CEF78907-521C-4205-A463-017552EE474B.jpeg
     
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  16. Mark9

    Mark9 Senior Member
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    Doh, the fork seals are the wrong depth, I’ve contacted the seller, the ones they sent are 10.5mm deep but the ones in my bike are 12.5mm deep, I’ve emailed the seller.[​IMG]
     
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  17. Yorkshireman

    Yorkshireman Crème de la Crème

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    Is that a 10mm spanner in that last pic Mark, making its way to join the 10mm socket :confused:
     
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  18. Mark9

    Mark9 Senior Member
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    Has to be a 10mm, there aren’t any other spanner sizes are there?
     
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  19. Mark9

    Mark9 Senior Member
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  20. Mark9

    Mark9 Senior Member
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    Fork seals done, I didn’t want to take the stanchions out of the bike because that would mean having to faff about removing the headlamp and brackets which are supported by the stanchions, easy enough, for anyone doing a GT250A it’s 15w oil and only 145cc’s per leg, seems a really small amount but it’s correct.
     
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