The EC Fulcrum gauge makes it easy to set the fulcrum arm height for your HD Tillotson Carburetor. 

We designed the only HD fulcrum arm gauge on the market to help DIY and snowmobile enthusiasts who wish to rebuild their vintage carbs. Using the fulcrum arm gauge you can quickly and easily set the fulcrum arm height to the proper setting for consistent tuning.

The Fulcrum Arm height controls the leverage the fulcrum arm has on the inlet needle. The further the inlet needle comes out of the seat the more fuel flows around the needle and is available to the high and low-speed fuel circuits. Therefore it can have a considerable impact on the tune and performance of the carburetor. The fulcrum arm gauge allows you to set the fulcrum arm height for consistent and repeatable results.