I bought a UK L coded NC30 from a guy who brought in 24 bikes last year of all types. He took it to a shop back east to get the bike running and it only runs strong through the first 3 gears. It bogs and feels like it is misfiring in 5th or 6th gear at normal road speeds. Shop said the stock carbs were no good, so put on a set of parts bike carbs and installed 4 hole emulsion tubes and 115 main jets all around.

Carb ID numbers are not in normal range of NC30 carbs on lists that I can find//// E3D{B}FB7. They appear to be normal V4 carb racks, but the calibration and original application is unknown. L series bikes are supposed to have 120/122 mains with 5 hole emulsion tubes on the back and 4 holes on the front carbs.

Anyone have an idea of what these carbs actually fit originally?

Bill Silver

UK nc30 carbs have metal sliders in them which is the easiest way to identify them, there is a thread in the workshop about nc30 uk / jdm differences.

if you have the uk carbs id try and rebuild clean them.

If they fit they are only going to be off one of a few types of engines,, nc21/24/nc30/nc35.

The NC24 had 115 mainjets all aroudn in it so they could well be nc24 carbs.

any pictures of the carbs?