this is the worst
YouTube - Beware of cheap engines - PK50 & PK80 assembly process
and this is not a thorough test
http://www.youtube.com/watch?v=p8Ycvad7NN4&feature=related
YouTube - skyhawk factory work shop BY WWW.MBBIMPORTS.COM.AU
http://www.youtube.com/watch?v=5hz_B3IS2H4&feature=mfu_in_order&list=UL
YouTube - Beware of cheap engines - PK50 & PK80 assembly process
and this is not a thorough test
http://www.youtube.com/watch?v=p8Ycvad7NN4&feature=related
YouTube - skyhawk factory work shop BY WWW.MBBIMPORTS.COM.AU
http://www.youtube.com/watch?v=5hz_B3IS2H4&feature=mfu_in_order&list=UL