Does the carb have to sit parralel?

[DreyeIce]

I have my cadet, just re-assembling the motor gonna try to start it,and atm i have an MB 24 A carb on it, it has the fixed float attached right on the carb body, and it sits slightly angled back,

every cadet ive seen had the UB 24 carb with the 12* float housing so even though the body is angled, float housing sits completly parallel,

so this leads me to the question, do i need to find a UB24 (thought they do seem more popular) or can i stick with the MB24 with no problems? basically does the float angle affect operation,

-Nick

[Duccout]

I believe that the float chamber must be upright. All the old Amal carbs had float chambers that were angled in relation to the carb's downdraught so that the float was upright.

[Monty777]

Originally Posted by DreyeIce

I have my cadet, just re-assembling the motor gonna try to start it,and atm i have an MB 24 A carb on it, it has the fixed float attached right on the carb body, and it sits slightly angled back,

every cadet ive seen had the UB 24 carb with the 12* float housing so even though the body is angled, float housing sits completly parallel,

so this leads me to the question, do i need to find a UB24 (thought they do seem more popular) or can i stick with the MB24 with no problems? basically does the float angle affect operation,

-Nick

Providing the angle of the float chamber isn't so large as to restrict the operation of the float in stopping fuel flow you should be able to get it to work right-you just have to get the float height set correctly.

John

[DreyeIce]

ok, what about an angle like this? acceptable?


thats the MB24A on it, im currently bidding on a UB24BS2 with a 12* float bowl, hopefully that will sit straight, cause the one on there is kinda back :|

[Duccout]

I don't think that will work!

[shat]

The carb doesn't care what angle, but the float bowl needs to be on a plane parallel with the horizon because the float must 'float' freely and should not drag along the inside of the bowl (thereby negating the effectivity of the float as a cut-off device). Float height in this type of carb is not critical as it is with concentrics and diaphram types.

A centered float in an upright bowl allows gravity to do its thing. In the pictured application, you need a 45 degree union which allows the carb to remain at that angle but positions the FB upright to maintain the float in a neutral position with respect to the bowl walls and thereby provides effective fuel flow control (not too much-not too little).

There out there.

[DreyeIce]

i see, well that angle is kinda exaggerated because one the pic was taken at a back angle, and in the bike, the front of the motor sits a little bigh tiger and the back drops, im going to try to run it like this, and if i notice any issues i will immediately buy the UB24 with the angled float bowl,

i was just curious about it, cause i know other float carb i have had for minibike and karts they said sit perfectly parallel, but this is different

[Macdesmo]

I think you need a UBF carb to have it correct.
Ian

[DreyeIce]

i know the UBF is "correct" but im not selling this bike, its purely for the fun of restoration and the value to have it, it jut=st needs to "look" and perform right


so heres what someone else said to me, find a 2-stroke carb for a 2-stroke, cause 4 stroke carbies are different, i did some research, and they are 4-strokes have a lower pickup angle and a hgher venturi, opposite for the 2-stroke i beleive, and a 2-stroke needs to be jetted bigger because of the added viscosity of the oil blend,

anyone know if this UB24BS2 is for a 2-stroke?

[Macdesmo]

That carb is for a variety of 4 strokes and 2 strokes. You will need e2 needle on the second position, 102 main, 40 pilot, 70 slide, 260A needle jet. I have 2 float bowls at low and high angles if you are still looking and also flanged carb body.
Ian