why?????? that sounds like painting a white wall white because it was white before you painted it white again - catch my drift!!! I don't think OS would put inferior bearings in a performance motor to start with - kinda hurts the marketing and future sales don't you think.

two plugs per head - 4-strokes maybe....high performance 2-stroke not worth the effort and the cost. Love to hear OS opinion on that one!!!!

We use OS "F" plugs in all our competition motors - mostly OS140's and 10 - 15% nitro depending on altitude of flying field. No real problems with that.

rgds