Carrier engine care

[Rohan]

Hi,

My dad and I got to take our "new" carrier for a test spin.
It was quite an interesting experience for a first timer in a tracked vehicle.
The only problem she seems to lack guts, especially when turning to the point where it kept stalling.
Plus she started to overheat.




(Above is my dad giving her full throttle)

On inspection of the engine we found a few things that need attention.

(1) The twin fan belts have perished, is there an of the shelf replacement? If so what size/brand ?
(2) A couple of the spark plugs could do with replacing. What brand/size do you guys use?
(3) The radiator seems to be full of rust "mud" , after a good flush do you use standard car radiator fluid ?
(4) We ran her on premium unleaded (96 octane) with a lead replacement additive. Could this be a problem?

Thanks for your help, hopefully we can get her running well for the weekend