The #7L is probably my all-time favorite carb. I have also purchased those O-rings from Tower that Chuck listed. Remember, like a Perry, you only turn the low speed adjustment a TINY amount at a time. 1/32" is an effective adjustment. Start with the screw slot inline with the axis of the carb throat. Bring the engine to idle. Pinch the fuel tubing. If it runs for a while, gradually increasing in rpms before dying, turn the screw to the right a tiny bit. If it dies more quickly without picking up when the tubing is pinched, turn it a bit to the left. Restart and check your transition. It doesn't take much to get this carb working great.

David