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  1. #1
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    Default Triumph GP 500 replica

    Got lucky and bought an ex race bike which was complete but needed some love, it had a lot of good points like a 1951 T100 engine with the all important alloy barrel and head, gearbox with CR gearset, a 1953 rigid frame which had previously been modified to Competition spec with rearset foot peg positions and rear brake pivot relocated to suit - this had been done with lots of braze and not much finesse, home made oil tank which wrapped around the seat tube and looked naff, great looking patina Thunderbird tank with a few dents but really cool. Wheels were not the best 7inch SLS front, rigid rear was ok, front forks were present but no oil looking a bit shabby.

    So what had a I bought ? well a good project in my eyes that would need a lot of love but the kicker was the parts that came with the bike - Brand new proper GP500 tank with the correct baffles all painted and ready to go, brand new 1 gallon oil tank with the correct breather tube, brand new chrome down pipes with correct megaphones, external oil filter, brand new twin Amal carbs & a mk2 sprung hub rear wheel in need of love - my plan is to build a GP500 replica or my version of one.

    What's a Triumph GP500 you may ask and for those that already know sit back and relax, so the story goes that during the war Triumph supplied a portable generator to be used in Lancaster bombers and this used a Triumph 500 Twin engine which had an alloy head and barrels, come the end of the war and Triumph built up a race bike for the IOM TT with this engine + a sprung hub rear wheel (this was a copy of a design used on landing gear off planes and stopped the need to redesign the rigid frame and used up old stock before going the swing arm route) Back to the story in 1947 the GP500 won the IOM TT and the rest is history, Triumph made a reported 150/200 race bikes and then sold a race kit with the parts to turn your T100 into a race bike from a Coffee chest full of parts, the engine mods were claimed to take the STD engine from a heady 32 to 42bhp.

    If your still reading thanks - I am a fair way along on the strip down so will post some regular updates so you can see any progress.

    Tank
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  2. #2
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    Found this nice tacho

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  3. #3

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    That tank is gorgeous

  4. #4
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    Quote Originally Posted by 45Brit View Post
    That tank is gorgeous
    Thanks, it looks even better in the flesh here's one with the badges fitted & painted up

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    Last edited by Dexter; 12-29-2021 at 12:49 PM.

  5. #5
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    Who supplied the tank?

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    Wow, parts porn! The lovely thing about old bikes is they don't require huge horsepower to be fun. Be cool to take part in a few sprints or hill climbs too.

  7. #7
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    Quote Originally Posted by farmall View Post
    Who supplied the tank?
    Not sure as it came with the bike

  8. #8
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    Quote Originally Posted by Hoghead View Post
    Wow, parts porn! The lovely thing about old bikes is they don't require huge horsepower to be fun. Be cool to take part in a few sprints or hill climbs too.
    Should go well for an old bike the close ratio gearset has a very high 1st gear so not much use for sprints which is a shame but looking forward to getting out on the road

  9. #9
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    Another specific GP part is the 1 gallon oil tank with top breather tube, it differs from the T100c with different mounting bosses.

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  10. #10
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    New Dunlop rubber seat cover so when the frame fabrication starts we have a size template

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  11. #11
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    First part back from the painters
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  12. #12
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    Quote Originally Posted by Dexter View Post
    Should go well for an old bike the close ratio gearset has a very high 1st gear so not much use for sprints which is a shame but looking forward to getting out on the road
    Road race boxes were often that way. My one outing on a DBD34 Gold Star started with lots of revs and clutch slipping.

  13. #13
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    Quote Originally Posted by Hoghead View Post
    Road race boxes were often that way. My one outing on a DBD34 Gold Star started with lots of revs and clutch slipping.
    Great when your on the run but standing starts not so...

    Wheel now with alloy flanged rim and SS spokes
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  14. #14
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    Quote Originally Posted by Dexter View Post
    Great when your on the run but standing starts not so...

    Wheel now with alloy flanged rim and SS spokes
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    Nice rim! Akront, Borrani?

  15. #15
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    Quote Originally Posted by Hoghead View Post
    Nice rim! Akront, Borrani?
    Borrani replica - really nice quality

  16. #16

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    I'm really enjoying this thread

  17. #17
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    Quote Originally Posted by 45Brit View Post
    I'm really enjoying this thread
    Thanks

    So a bit of work on the clutch plate.

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  18. #18
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    Shades of Brooklands racing, they'd drill holes in anything.

  19. #19
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    Quote Originally Posted by Hoghead View Post
    Shades of Brooklands racing, they'd drill holes in anything.
    More holes....

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  20. #20
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    Quote Originally Posted by Dexter View Post
    More holes....

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    Nice!

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