Well it leaks a lot from between the cooling head and engine block, keeps blowing gaskets and in generally is very to keep it running correctly. i think the two wheeled nature of this truck makes setting the idle speed very difficult however that should not cause all these other problems that i have been having.
I'm not having a dig at HPI engines, i love them they are very durable just i think i got a lemon which happens on all production lines apart from honda's VTEC line