Motorcycle Repair: throttle chop method, chop, combustion

Question
Hi, what is the way to accomplish a plug read by the above method, saw it somewhere. Thx.

Answer
Hi,
plugs will tell you alot about the way an engine is
running. The throttle chop means to
kill the engine quickly after a hard run.
The plugs will "remember"
that last 30 seconds or so of combustion.
Just run at the speed you want to check plug
condition at and then quickly pull in the clutch
and kill or "chop" the throttle and the engine.
Then read the plugs as usual, black=rich, white=lean
or hot, tan/brown=good etc.