S Spade88 New Member Apr 6, 2009 #1 Im am told that the 720 motor in the 97 sp is depowered using a different cylinder port timing than other single carb 720 versions. Is this true? What is the procedure to eliminate this, and upgrade to the higher hp rating? Rotary valve ? Thanks
Im am told that the 720 motor in the 97 sp is depowered using a different cylinder port timing than other single carb 720 versions. Is this true? What is the procedure to eliminate this, and upgrade to the higher hp rating? Rotary valve ? Thanks
