Basically a plug chop involves putting the bike under load at high revs
Chopping is where the ignition is cut at a certain RPM while the engine is under load
Hit the kill switch and pull clutch in fast , Slow down and with gloves on remove spark plug (hot).
the plug will have a colour which can be checked to given running conditions inside the cylinder at what every RPM or throttle position you did the run at . ie third , half full throttle or certain rev ranges .
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Black = rich
Brown = good
Grey / white = dangerous conditions
for advice on jetting and which jets to use see here
CARB SETUP
Set it to rev at 2000 with the idle screw, then twiddle the air screw just to the left of the idle screw... turn it all the way in, then back out 1.5 to 2.5 turns, listening to engine. As you turn it, revs should increase slightly. Set it to a point that revs are at highest and smoothest. Now use the idle screw to tune it back down to around 1100rpm ( i normally set mine at 1500rpm )... that should be the carb as set as it can be.
Carburetor Tuning : Listening For Rich And Lean Conditions
for advice on jetting and which jets to use see here
CARB SETUP
Set it to rev at 2000 with the idle screw, then twiddle the air screw just to the left of the idle screw... turn it all the way in, then back out 1.5 to 2.5 turns, listening to engine. As you turn it, revs should increase slightly. Set it to a point that revs are at highest and smoothest. Now use the idle screw to tune it back down to around 1100rpm ( i normally set mine at 1500rpm )... that should be the carb as set as it can be.
Carburetor Tuning : Listening For Rich And Lean Conditions
Carb settings and adjustments tutorial
Video series
BUY the ultimate Aprilia RS 125 workshop manual bundle HERE
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