| with the 4 strokes the race CDI will let them rev higher & not limit them like the stock CDI's do (a good cheap upgrade)
there are several aftermarket parts available as well as lightened internals etc...
i tend to like the lifan engines as i have changed the oil in both the ducars & lifans after their first short ride & the lifan engines have less clutch fibre & the oil is in much better condition than the ducars
the ducars tend to have more wear & tear on internal shim's bearings & clutch from a short run in period so in my opinion the lifan engines use better quality parts or have a better assembly line? | 
