I bought this to use on my MLM 18mm clamp intake with a Mikuni VM18 carburetor. Its a very tight fit. However the shim has a lip that does not allow the intake tube to push all the way into the carburetor rubber seal and make a good seal. I think because of this I had an air leak where the carb is split to allow it to clamp because the plastic shim would not let the carb push in far enough. I bought this because it was cheap and recommended when purchasing either the carb or the intake, I don't recall which. I ended up putting the split shim back on that the VM 18 came with.
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1 taco eaters like this review
This is the RIGHT shim for a VM18
July 8, 2017
taco eater :
Ismael Canas from Imperial Beach, CA United States
If you have an air leak that you can't find, it's likely the crappy split shim that comes with the VM18. This will solve all your problems. Fits 100% perfecto right out the gate. Hobbit runs right as rain now with this shim!
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2 taco eaters like this review
phbg over vm18?
May 12, 2013
taco eater :
Andy from ATL
If that's what you think than this is just what you need to clamp mount a phbg onto a vm18 intake! ALRIGHT!
Am I doing it wrong? 
This is the RIGHT shim for a VM18