McCulloch Pro mac 510

M

midnightmaniac

Forum Newbie
Looking for help reguarding a old saw my father in law used in the late 70s.He passed away last year and my mother in law wants me to get it running.
The saw is a McCulloch pro mac 510 and not many parts are available.
Started out rebuilding the zama c1 carburetor,replacing the fuel lines and adding a bulb type primer. Got the saw running and after a few seconds it would lose all spark and die.Coil tested bad so i replaced it with a used one as they are no longer available.Replaced the points and condenser with the oregon ignition module.Saw starts and runs but when running at a constant speed it will begin to rev then die. Any help woud be appreciated.Thanks
 
Ive tried settings from 1 turn out on both needles to 2 turns out.This saw doesnt have a vented fuel tank.Could a leak in the tank cause this?
 
OK,Repared crack in tank.Replaced intake and carb gasket and still no change.It will start,run a few seconds,rev then die.Checked compression and it has 82 psi and 85 with oil in the chamber.
What is the problem with this thing?
 
Tried that too.push the primer in and it would stay sucked it.
Relized last night I was suppose to do the compression check with therotle wide open.I didnt do that.
Latter today I will recheck that.
 
Instaled a new piston and ring.Got a 3 pound increase in compression.
Same result.Its hard to start,runs about 30 seconds.revs and dies.
Where could this be sucking air from?Im at a lost.
 
There is NO WAY to correctly add a primer on these units without changing the carb. Could you give me a diagram of how you routed it?

I just restored one of these units, and they really don't need a primer - adjust them correctly and they will start in a few pulls.
 
You must log in or register to reply here.
Back
Top