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What Hippo started and HDWrench finished.........................in the leaded fuel days you "tuned" you bike, went for ride taking your plug spanner and screwdriver with you and usually in a fourth gear hard run........, clutch in and at the same time shut the motor off (chop it as Hippo says) and then coast to a stop, pull BOTH plugs and have a look.

You were aiming for tan color and grey in the exhaust pipes............this got you pretty close to optimum for your open or main fuel circuit........obviously if the plugs were dark then you pulled the main jet and went down a size and did it all over until the plugs went tan in color............

As HDWrench stated, mostly 2.25 to 2.5 gets most carbs sorted out for idle circuit......................got to turn the idle screw in/out to aim for highest rpm, then adjust throttle stop and re check idle rpm, then turn idle screw in/out again to see if rpm increase again and do this again until rpm is set..........usually 2-3 times is enough.

Acceleration circuit does take some time to get right because now you are experimenting with needle depth/height, then needle thickness, etc. aiming for highest acceleration without stutter or bogging down, both of which indicate too rich........

AFR...........14:1, approx best fuel mileage
................13.5:1 good power with good fuel mileage
................12.5:1 excellent power but mileage suffers somewhat.

Merry xmas to you and Hippo and HDWrench and all the other guys who chimed in on this one......., Ozzie
 
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