timing for a twin plugged shovel

[Kiwi]

what degree of advance should be used for a twin plugged shovel

either fully advanced or fully retarded?

I have a degree wheel and can find top dead centre

[Phil]

Just my own personnal preference. With shovels I use thirty five degrees of advance on the front cylinder at two thousand RPM.
I would retard that five degrees with twin plug heads & go from there.

[Kiwi]

thnaks phil

found an article in one of my books last night, it said 30 degrees for twin pluggwed shovels as well

got to be a good starting point