Originally Posted by Frank L

They are the same 3 needle carb. It's called a J carb. The speed. Session is just black and has red ano inserts. Now there is a newer os carb, J2. But the needles are a little different more like the werks carb with a short LSN. I prefer the older J carb on my newer os engines I just like the way it tunes.





Here's the J carb

http://www.amainhobbies.com/product_...21J-Carburetor