F4.6 or k4.6 which is better and why

[H.S.I.C 4.6]

I wold like to know which motor is better and why? Honestly whats the diff besides rpms? Thanks

 

[IamSavage]

the only different i know is that the k4.6 is ment to have a higher out put hence the k4.6 HO

 

[Mikey D]

The f4.6 is made by ofna an the k4.6 by axial. The f4.6 is a screamer an ive seen them still chuggin after 10+ gallons if tuned right. The k4.6 is a good engine to. Only downsides to the k4.6 is the carb an the drop off at higher rpms. The mid range screw has o rings that are to small an cause it to vibrate in or out an leak causing a headache while tuning. I always put the roto start shaft orings on the mid screw an don't have problems after that or you can put a lrp carb on it an not worry about a mid screw at all. They both have 9mm carb inlets. All in all theyre both good engines if tuned an maintained correctly. Ive had both an enjoyed them both. I liked the k4.6 better but thats just my opinion.