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When installing your Dellorto SHA Carburetor onto an Intake, this little shim is what makes it fit perfectly, and keeps the leaks out.
Some common sizes are:
- #1 - 2mm thick for SHA carbs
- #2 - 1mm thick for SHA carbs, also oem a3 shim: tomos part number 219586
- #3 - 1mm thick for SHA carbs, (will not fit 14:12) use on some puch, motobecane and peugeot intakes
- #4 - 1.5mm thick for SHA carbs, 14.12, 15.15, 16.16 . . . Tomos intakes use this shim
- #5 - For 13.13, 12.12., 12.10, 12.7 SHA carbs, most commonly found on vespa and kinetic mopeds.
- #6 - 1.5mm thick for SHA carbs, (will not fit older 14:12) these come in the newer 14.12 carbs
- #7 - 1mm thick for SHA carbs, (will not fit older 14:12) these come in the newer 14.12 carbs
Here is a handy guide from Dellorto on how they measure sizing. We are using the first two dimensions.
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Good shim 
