The PAW engine has Varijet carburator and the coolingfins are green, it is a 60 size engine also a PAW 60 TBR-R/C while the engine with darkbrown cooling fins are a 40 TBR-R/C size engine. Both 40, 49 and 60 has Varijet carburator.

All anodising in coolingfins has been withdrawn as of 1st June 2007..[]

You need 16/8, 15/6, 12/6 propeller for your PAW 60 TBR-R/C , read instruction for Varijet carburator: http://www.rcuniverse.com/forum/fb.asp?m=5991650