>>Wasn't the DX model a later version, with the restricted engine?
No, just a disc brake.
>> it would go over 80 mph
No it didn't, silly boy, not with the 49cc engine. You could only make it go noticeably faster by making the engine a lot more than 49cc, and the stroke and crank limited the max revs in the standard engine.
Probably not gearing changes. AFAIK the only way to change the gearing on the new one was to change sprockets, and that way what the Lord gave in top speed he took away in acceleration. However, the restricted FS1E could become the unrestricted FS1E pretty easily, since it was the same engine and all you needed to do was swap the bits over.
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