- 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.
Repair Kit and Diaphragm Gasket for the carburetor:
Main: RK 1 HW and DG 1 HW
Optional: RK 2 HW and DG 2 HW