Yep that will make things difficult Norm if it's the OHV motor ,a new cam is probably a $100.and a new ohv 11.5 is $1000.
I can't see a quick cheap repair for this ,unless a cheap second hand car starter motor could be fitted with an old car battery.
It could be bodged up by drilling the spark plug base and fitting a connection with copper pipe to a remote decompressor but
that would be a hassle every time the plug needed changing.
Cheers
Max.
