This is my Giant 860 ATX 21 speed daily rider equipped with a GT-5 style two stroke bicycle engine. It has the shorter type "B" piston and a 38mm stroke; these are the engines that guys in the motorized bicycle racing world use to soup up and get blazing down the track at speeds up to 50mph. This bike will not go 50 as is, but I have done a basic port job on the cylinder to improve flow and ive...
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