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3) General Discussions..No problems but would like to discuss your Chinese quad experiences post in here.. You can also post in here why you hate your Chinese quad..
Those front shock mountings are fairly unusual, seems to have two alternative top mountings. Otherwise, the standard plastics and Honda Cub clone engine are used by many makers. Pity someone painted the plastics, it never sticks to the soft plastic used on ATVs, for long.
The engine number prefix is coded, with the bore included in the code, i,e, 157 means single cylinder 57mm bore, this doesn't pin it down exactly as Chinese makers mix and match bores and strokes. However I'm fairly sure the capacity is also cast into the cast iron cylinder too. That engine is made in sizes from 50cc to 150cc.