February 21, 200818 yr Just got myself an 06 250 pro looking to adjust the carb as it keeps cutting out at low revs looked through the manual pretty basic info and not being to mechanically minded which screw is which and which should i be adjusting
February 21, 200818 yr Just got myself an 06 250 pro looking to adjust the carb as it keeps cutting out at low revs looked through the manual pretty basic info and not being to mechanically minded which screw is which and which should i be adjusting It's probably a Dellorto PHBL26, which has a fuel screw. If you looks at the side of the carb body, you'll see two adjustment screws, one in the center of the carb body and one to it's left. The screw in the center sets the idle speed. The one on it's left is the pilot circuit fine-tune screw and you'll probably want to adjust that one to start with. After warming up the engine, quickly open and close the throttle and turn that screw in or out until you get the best throttle response. You'll also probably then want to adjust the center (idle speed) screw in a slight amount as the Pro's generally work better with a slightly higher idle to keep from stalling easily. Cheers. Jon
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