Hi everyone.   My ex USA DT3   1972 has carb.issue.    After a load of sorting I thought I had finally cracked it.  Has been running well for several hundred miles when petrol started poruing out of carb overflow from float bowl.  Thinking needle valve sticking or perferated float I stripped carb. Could'nt find fault so assembled and problem cleared Just dont another 200 miles and the same thing again. getting pissed off now cos I still cant find problem.  Any help out there. . I am thinking of changing carb as throllte now jamming open. It,s been one thing after another so I am thinking of new carb. Can't afford a Mikuni ,so is there a cheaper carb out there that will do the job. I'll even buy Chinese if I have to.   Hope one of you out there can help a real frustrated biker.

 

Overflow issue is likely some sediment or rust from the fuel tank .
Throttle sticking issue possibly from an over tightened flange nut ,
or an O ring in the flange that has too large a cross section diameter .
Both these can warp the body enough for the slide to stick open .
Been there , done that .

If you want real frustration, then buy a Chinese carb. 

Thanks Swoop56. Makes sense as I had to change fuel filter owing to the ethonal melting filter .. Thanks a bunch.

Thanks Mark . I will persivere with my Mikuni.