Hi Speedy,
It's a GXV-160 overhead valve / push rod engine that's fitted. Probably Honda's most successful engine and the one that all the Contractors prefer to use.
Those things are fully serviceable opposed to the GCV-160 which has the overhead cam set up and is a bit of a troublesome unit.
If it has carby issues then that's easily overcome and thus you'll have a good machine that's well worth saving longterm. The Honda Chassis's are pretty much the best out there apart from the Greenfield Enduro's which are loosely similar to the Honda concept.
Cheers,
BB.