DBXL 2.0 Fuel adjustments

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Lucien1986

Lucien1986

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Hello,

Maybe i missed a thread but couldnt find it. Maybe because english is not mine first language. Anyway.
When the engine is warm from my dbxl 2.0 gas and i pick it up and go full throttle i notice he is holding back and stutters. Ice tried to high and low speed needle and the other one but it stills stutters when going Full out. What am i doing wrong?
 
Try opening them up a little at a time , counterclockwise ( unscrew).
The Third one is idle speed.
The two mixture screws are in line on the side of the carb, one closest to the engine is low speed and the one closest to the air cleaner is the high speed screw.
 
Rep732 said:
Every dbxl 2.0 my friend has sold new needed the pop pressure adjusted. Adjusting needles will never fix the issue.
Click to expand...
to be honest buddy, i did the pop pressure on my carb and it didn't change anything in terms of performance/tuning for me, if i was him first before stripping the carb down, is try other things that are easier/cheaper as he prob doesn't have the tools, so to the OP i would try:

-Changing Spark plug, even if you have a spark, does not mean the plug is ok, so just change it with a new one to be sure.
-Lean out the High Speed Screw slightly by turning needle anti-clockwise.

Failing this then i would reset needles back to factory setting then re-tune from scratch. to do this just wind both needles all the way in (Clockwise) until you feel resistance then stop! don't force them when you feel the resistance or you will damage carb. Then to reset to factory settings: Turn the L (Low) needle anti-clockwise 1&¼ turn, then for the H (High needle) Anti Clockwise just under 2 full turns. then just retune starting with the Low speed needle first by leaning it out (clockwise) a little at a time, when i say a little, think of a clock face then just adjust needle in 5 minute increments, then once low end is tuned, do the same for High Speed needle, once high end is tuned, you may need to adjust the low end again just a little ;)
 
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