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Originally Posted by gixxer_junkie_m
So what you are saying is ,it has a similar affect as indexing the plug?
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Indexing a plug will effectively position the ground electrode in a way , to spread the spark kernel ....but the ground electrode is still in the way ,and the flame kernel spreads first horizontally then into the chamber. Side gapping and surface gap plugs actually present the flame kernel into the chamber , and the flame spread is faster and complete.
Performance Unlimited 4-Wheel & Off Road Center - Hartford, Wisconsin - USA Technical Documents please read this to get details. Regarding your other query of which spark plug for the 195 cc bike , it is best to stick to stock spec. first find out the heat range originally recommended and pick a equivalent surface gap one from NGKs site.
The pic i had uploaded is of NGK BP 6 ET(3 electrode) and Bosch(4 Electrode).Both are non resistor type.These are for cars.Denso ,Lucas England,are some of the other manufacturers of similar plugs.You must match the original plugs dimension and HEAT RANGE....
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If you have any old CR7E or CR8E plugs lying around..then side gap them and see the results.