inner rotor kit for pit bikes

[binky77]

i found this on ebay is it any good and do you think it will fit into a 138cc lifan(127cc)

http://cgi.ebay.com.au/Mini-Dirt-Bi...ryZ72529QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[mjc85]

Yepppppppppppp

 

[binky77]

sweet so do you know if there easy to install or should i get a mechaininc to do it?