This should be what you need to upgrade three original Kawasaki H1 VM28SC carburetors, applies to model H1B 1972. Here we have 3 kits of Japanese quality needle main jets + washers for your. 3 pcs Needle Jet O-4/8mm.
Undergoing a winter transformation, a lot of work to be done. However, The kit was installed along with carb rebuild, and upon starting bike seemed quite strong, idled nicely. Have not taken to the road yet as new tires are needed. Will advise more towaeds spring when bike will hit the road. So far, impressed with kit!!!!