put on rebuilt carbs,has a little trouble starting (not sure if the choke is set right).. know its hard to see but ... 3 plugs look like this one is somewhat less oily..
The choke is just an electromagnet.
When energized it pulls the choke rod up into the magnet.
Sometimes the end gets gunked up and needs some WD or spray cleaner.
What are the carbs air screws set at?
They usually need to be set at 1 1/2 turn out for initial adjustment.
Do a compression and spark test, post results.
At the top of this forum is a sticky, it shows how to set up your carbs and timing.
No, the timing is usually not affected by anything other than someone adjusting it.
The timing doesn't jump.
The plastic connectors can break and when the throttle is moved,
it can open and the timing not move like it's supposed to.
Gone??
The pump is at the bottom of the electric motor. Should have 4 hyd.lines connected.
Check the oil (30w) and add if needed.
If the motor turns? then the pump might be bad? or low on oil.
Do some more looking?
Post some pics of the unit.