Quote:
Originally Posted by lineman12345678
I re-jetted it with DDK needle middle position 178 main and 40 Pilot... I am only a half turn out on the fuel screw. The farther I go out on the screw it starts to blubber.
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It's an air screw (not fuel screw), as you turn it out then you adding more air and leaning the mixture. Since you can only go 1/2 turn out, it indicates that your pilot jet is too small.
Leave the needle clip @ 3 position (middle). Then go after the pilot jet to get it correct first. You should try to be in the 1 to 2 turns out range. This allows you adjustment flexibility in the future for temp/humidity changes.
Approx. same air/fuel mixture, I would try the 42 pilot.
Current setting: 1/2 turn out air screw @ 40 pilot.
New setting: 1 turn out air screw @ 42 pilot.
Note: pilot jet influences the 0 to 1/4 throttle range.
AFTER the pilot jet is good...
Then I would investigate the needle clip position. The needle clip position influences a broad range from 1/8 to 1/2 throttle. If too rich, more clip up 1 notch (2nd position). If too lean, more clip down 1 notch (4th position).