Carby New HT Carby Fitting

Discussion in '2-Stroke Engines' started by BoltsMissing, Sep 7, 2008.

  1. BoltsMissing

    BoltsMissing Active Member

    The pic below is shows how it panned out so far with a HT engine on 27" steel frame.
    By the looks of things, some plumbing might be due..., ongoing project.

    The bike being used is not a regular build bike, but using the 27" frame to "dummy" fit HT engines where special brackets are sometimes required.
    So if the new carby has problems fitting on a 27" frame, then I assume it will have similar problems on MTB or 26" frames.
    I think it's an oversight by the suppliers, they don't build bikes, do they ?

    The new carby however looks well made, comes with cables already connected to handle-bar grips, choke levers etc. ( plug and play)
    Seems good value for under $80.00 AUD
    I'm thinking of plumbing the airfilter intake rather than messing with the manifold.

    Attached Files:

  2. Drunkskunk

    Drunkskunk Member

    Carb looks good. what about getting a 90 degree elbow from a plumbing shop to add to the intahe, then the airfilter could sit off to the side.
  3. BoltsMissing

    BoltsMissing Active Member

    yes drunkskink, I imagine and hope to take advantage of angled fittings so air-flow is forced in, yet again not restricted by too many angles, or protruding too far out to one side and get in the way of peddling.
  4. arceeguy

    arceeguy Active Member

    Looks like they need to engineer an offset intake to accommodate the new carb.

    It certainly looks great though! And it fixes one of the major character flaws with the NT carb being essentially non-adjustable. (idle/low speed mixture)
  5. djase10

    djase10 Guest

    Thats some crazy space you had to play with bolts,

    well done...

    Have you noticed extra OOMPH through-out the rev range,

    better top speed?
  6. BoltsMissing

    BoltsMissing Active Member

    I was hoping to have something by this weekend until a week ago while filing a piece of metal to square this bracket, dislocated left shoulder,then shingles on that shoulder's nerves flared up and that flu bug gettin about all in one hit. So no go yet.
    Let ya'll know when it's sorted.

    For those who don't know what Shingles is, it's a sort of by-product of chicken pox, according to google it lives in the nerve cell.
  7. djase10

    djase10 Guest

    Heya Bolts,
    Shingles=======man thats some pain you have then,
    Hope ya get well soon,
    all the best
    Regards Jase
  8. BoltsMissing

    BoltsMissing Active Member

  9. fetor56

    fetor56 Guest

    Say when u get your carby done to your satisfaction can u let us all know what it's like in comparison to standard......better/worse,pros/cons.
    BTW...Look after that shoulder,none of us ain't gettin any younger. :)
  10. BoltsMissing

    BoltsMissing Active Member

    Will do fetor, djase is right, niggling pain. It feels like the skin is ripped out from the back of the left shoulder, under the arm pit, under the left upper arm and around left side of chest, it all feels like the skin has been peeled off. But it's all in tact really. It's the nerves, that's where the shingle "lives" in the cell of the nerves. And all I want to do is test this carby !!
  11. BoltsMissing

    BoltsMissing Active Member

    Getting there,
    Shingles can last up to,12 months, thats 12 months of pain, for no reason, I did not do it, it wasn't me !

    However, the show must go on, have sorted the carby by a few mods. on special engine mount brackets I was making for 27" steel frames.
    Chain fits ok was my main concern, nearly ready to test this thing, shoulder popped out again, but got the engine bolted on at least.

    Attached Files:

  12. QuadManiac

    QuadManiac Member

    Is that a remote choke cable i see in that pic?
  13. Mountainman

    Mountainman Active Member

    hey Bolts

    I see that you have that engine mounted with plenty of space now -- nice

    we hope and pray that you are feeling better soon

    so that you will be up to ----

    Riding That Thing Bolts
  14. BoltsMissing

    BoltsMissing Active Member

    Yes, comes complete. Good value.

    yeah if you have the space in the V, raise the engine, but then you have to fabricate another bracket for the rear mount, still working on it when time permits.
  15. jamesburr36

    jamesburr36 Member

    Why can't you just put a 5mm spacer between the engine mount and the bike frame? It might mount the engine a little higher on the bike but not enough to make a difference yet allow the carb and air cleaner fit without touching the frame.
  16. BoltsMissing

    BoltsMissing Active Member

    Because it has already sheared the rear engine mount studs before when using spacers.
    The method I using now is a cradle mount, where you mount the engine on cradle, and mount the cradle to the frame. Slide the cradle up, makes space and tightens the chain at the same time.
    Last edited: Sep 25, 2008
  17. BoltsMissing

    BoltsMissing Active Member

    Well, I got it running today for a while, before I finished the fabrication on frame cradle.
    I runs fine, revved it, has plenty of torque, but could not ride it, more of a bench test while the bike was secured on a stand.
    Adjustments on 1 of the 2 screws was impossible, it kept coming loose due to normal engine vibration. The spring inside one of the adjust screws seems too short, therefore not able to keep set on thread.
    This screw is the one closest to rear of carby.

    Then I did something I knew I should not have done.
    With the engine running, I wanted to see if it would smoke the back tyre.
    It did, and bent one of the plates of the unfinished cradle. This is actually a good sign, it bent the cradle, not shear the engine mount bolts.Easy to cut another and replace.
    The plate is 3mm stainless steel. One more test later and if it bends again then I'll go for the next size thickness.

    Due to the added torque and seemingly better engine performance, I'm sceptical what bike frames will endure in the long run with a 70cc and this
    new HT carby.

    Attached Files:

  18. jlebh1

    jlebh1 Member

    I bought the exact same carby from zbox australia for $65 its great if you want more space get longer bolts
    (just long enough to fit another engine spacer and use 2 spacers) then bolt away. or you could do what I did and take it anywhere that can cut part of the manifold off then put it sideways so the whole carby sticks out the side then they can weld it back (they shouldnt charge you anything) this carby is great read my reveiw - the carby is great and is worth buying.