carb trouble

[bikerisme]

hi, just got a 76 triumph t140 having trouble with it not wanting to rev pass 3500 revs took out plugs and they are very sooty. the chokes are not sticking on can you adjust the float hight on these carbs and if so how? it has twin mk 2 amals fitted thanks

[neracarken]

Does it have air filters on? If so, are they clean, new ones?

[bikerisme]

hi yes its got air filters fitted brand new left carb seems ok by looking at plugs right  one seems to be the problem well sooty didnt know if you could adjust float hight on these only know about monoblocs this has amals mk2 guess i will have to rip it apart and check it i know its not dirt  becouse i drained it all ok and it doesnt seem to be flooding so didnt know if float level to high ?

[L.A.B.]

didnt know if you could adjust float hight on these only know about monoblocs this has amals mk2

Mk1 Amal float heights are adjusted by tapping the brass float needle seating in the float bowl either up or down slightly with a flat punch (and not by bending the tangs on the float).
However, I do not know if the same applies to Mk2s?

As it's the 'old' R/H carb that is apparently running rich, what I suggest you check first is that the choke plunger mechanism is seating properly when the choke is off? The rubber choke plunger tips can also perish and break up, so they do not shut off the choke circuit properly, which causes rich running.

Presumably, you will have already checked that all the jets, throttle slides, and needles are identical in both carbs?

[bikerisme]

hi,checked float etc both cabs are running same jets,needles.and slides and chokes seem to be closing fully will try changing over choke plungers and see if problem reverses to other carb but rubbers appear to be ok but its worth a try thanks for your help

[bikerisme]

think i have found the fault,the bracket that works the choke unit on the right carb was slightly bent and didnt let the choke off fully so it was openletting fuel by making the mixture rich on that side will know for sure when i reassemble and try it couldnt see this without removing carbs many thanks for your help