Hi,Nick! If you`re determined to keep the higher geared (less teeth)sprocket on the rear,I'd go ahead with the 70cc kit. Then to protect your gearbox from the extra strain,substitute the regular lube oil with the equivalent in fully synthetic.With the extra power you gain you won't care so much how soon it shifts down.But you've got to break the new kit in right! Be patient and don't go full throttle for more than 20 seconds at a time.And don't use 2-cycle synthetic until you have 300 mi. on that 70cc kit! BYE!
Re: Stock vs. 60cc vs. 70cc
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