[piniongear]

Originally Posted by seventyiron

Looks like a VM38..one of the best carbs Ya can put on a IronHead.
Parts are found at Sudco,I will get Ya a link,and you can Google it also.
All You should ever need is gaskets!

This is a month and a half old thread but perhaps this info will help someone out.

Ditto that! Best carb you could hope to have on the Sporty. Looks like a VM38 to me as well.
This would be a 38mm round slide carb. 38mm is the correct size for a Sportster. A 40mm carb is made to fit a big twin, so if this turns out to be a 40mm, it is too large to be running on a Sporty.

Anyway, the carb slide has a needle inside the slide.



Remove the screw top and carefully remove the slide and throttle cable.
The slide needle will have 5 notches in it and a clip secures the needle in place.
The clip must be in the middle notch. That is the third from the top or the third from the bottom. This sets the position of the needle's tapered end in the main jet below.
Other than that, leave the carb alone if the bike starts and runs OK at present.
I have run a Mikuni since 1973 and this same carb has never needed anything, not even a throttle cable replacement.
As was said..... parts from Sudco or one of their distrubuters......... pg