Hey feelers.. I have been spending alot of time lately riding my daughters ole xr 70 (she moved up to a kx65) around a small track I have been working on for her and my 5 yo son (ktm 50). My bike is alittle big for the track but the 70 on the other hand is perfect for chaseing them around. My problem is the 70 is worn out. Motor wise and shocks. What about a Lifan engine, are they any good? or an 88cc kit? Any thing I should stay away from? Any one have any suggestions for me?