carbs on a 4 stroke

Discussion in 'The Workshop' started by kylespeedfight, Feb 20, 2013.

  1. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    since my carb has a crack in it, i was wondering, would a bigger 2 stroke carb work or make any difference to a 4 stroke engine? And would i need to buy a new inlet manifold to fit it?
     
  2. Todi-Corsa

    Todi-Corsa 4 stroke thumper

    Messages:
    336
    gone from a 17mm as a 50 to a 19mm on my 80 didn't want to go too big as it will drink fuel more than it needs too
     
  3. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    is that on a 4 stroke engine? and is there any difference in power/speed?
     
  4. Todi-Corsa

    Todi-Corsa 4 stroke thumper

    Messages:
    336
    yes its a 4t and there will be for me mate I've also changed a lot of other things aswell as the carb in one go, I'm yet to fire her up though due to being busy

    tbh if you get a bigger carb it will rev better if its bigger than std as it can draw air better, but don't go bigger than you need or you will just waste fuel :)
     
  5. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    thanks for the info mate, i hope yours runs well :) i seen a koso 30mm carb for cheap but is that way too big? its a 100cc engine but i dont know the original carb size
     
  6. Todi-Corsa

    Todi-Corsa 4 stroke thumper

    Messages:
    336
    Cheers mate :)

    30mm is a bit overkill, a nice 20 or 21 will do on a 100 :)
     
  7. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    c
    there all 24mm and up, with a manual choke, and does 24mm or whatever mean the size of the inlet?
     
  8. Todi-Corsa

    Todi-Corsa 4 stroke thumper

    Messages:
    336
    24 should be ok, and yes its inlet size, the middle bit :)
     
  9. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    oh right, thanks for the help mate :)
     
  10. TeZ258

    TeZ258 Member

    Messages:
    245
    Rides:
    Speedfight 50cc
    Thought you had a speedfight Kyle ??
     
  11. kylespeedfight

    kylespeedfight Active Member

    Messages:
    549
    Rides:
    New Gilera Runner 70
    got rid of it mate, nothing but problem after problem, but i did love it! i now have a honda lead, nothing special but was only £40 haha
     

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