• Butterfly Opening
  • Racing Class Venturi/Body Design
  • Racing Class Inlet Needle and Seat Design


KF Engines vary by manufacturer, manufacture date and tuning. For optimum performance, you might need to try different settings. Below is a listed of recommended settings, starting with most recent/most popular first. For best results, start with the most recent and then adjust first the High then the Low needle each in 1 minute increments up to 3-5 minutes each (extreme conditions like hot or rainy weather may require a little more). If you are not satisfied, repeat the procedure with the next setting.

L= 2’40”

H= 0’20”

Repair Kit and Diaphragm Gasket for the carburetor:

Main: RK 1 HW and DG 1 HW

Optional: RK 2 HW and DG 2 HW



Weight1 kg
Venturi Diameter


Throttle Bore Diameter


Throttle Bore Range

Product Line


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