Looks like that carb might be the way to go.
Looks like it might need a screw in jet in the bottom of that one.
UNC is a coarse thread. UNF is a fine thread. Cant remember what the U and N mean, something like Unified National.
Generally the finer the thread the shallower the thread is. (so the closer the tapping drill size is to the bolt size)
The older TVS90s are found on Victas mostly.
The newer ones ive seen on most, masports, victas even the odd Rover.
Bob.
