The plug on the left is operating slightly cooler than the spark plug on the right and there does not appear to be any detonation occurring. That is ALL that can be concluded!!!!!!!!
A spark plug cannot tell you if you have the jet in the carb that is making maximum power. You have cut off the part of the spark plug that tells me if the combustion temperatures are in the ball park when the jetting is in the RANGE of making maximum power.
You need to devise a method for gauging performance while testing different sizes of main jets so that you can determine which jet makes the most power......then monitor the spark plug for signs of detonation and the proper heat range for your riding style and conditions.
