I sold my entire McCulloch collection... but just the other day, came upon an extremely clean Pro Mac 555. Price was right so I bought it.
The saw is in fantastic condition, magnificent compression, very nice paint. The saws fasteners, shields, and grommets all appear as though they have never been touched since it left the factory. The problem is, it just won't fire.
I pulled the plug boot and checked the spark with two different in-line spark testers. It sparks consistently and crisply. I've cut wood with chainsaws that had this amount of spark... so I figured it had strong enough spark. But now I'm not sure.
When I put a spark plug in the in-line tester, there is no spark across the electrode. I then tried this with five different spark plugs, with no success. Whether I hold the plug against the head for positive contact, or hold it out in the air, still no spark.
If I take away the in-line tester and put a spark plug directly in the boot coming from the saws coil,, still no spark across the electrode whatever I do.
Yet when I put the in-line tester back in, it sparks consistently in the in-line tester, and presumably strong enough to at least jump across the spark plugs electrode... but still no spark across the plugs electrode.
Of course when I turn off the ignition switch, there is no spark in the in-line tester. Then when I turn the switch back on, it sparks in the tester.
I have no more extra coils to try on this saw, since I've sold all the McCulloch's.
Question: Is a moderate and consistent spark in the in-line tester enough to jump across the electrode of the plug, or can normal impedence in the spark plug inhibit any chance of a spark at the plugs electrode in the event the coil is weak?
.
I
The saw is in fantastic condition, magnificent compression, very nice paint. The saws fasteners, shields, and grommets all appear as though they have never been touched since it left the factory. The problem is, it just won't fire.
I pulled the plug boot and checked the spark with two different in-line spark testers. It sparks consistently and crisply. I've cut wood with chainsaws that had this amount of spark... so I figured it had strong enough spark. But now I'm not sure.
When I put a spark plug in the in-line tester, there is no spark across the electrode. I then tried this with five different spark plugs, with no success. Whether I hold the plug against the head for positive contact, or hold it out in the air, still no spark.
If I take away the in-line tester and put a spark plug directly in the boot coming from the saws coil,, still no spark across the electrode whatever I do.
Yet when I put the in-line tester back in, it sparks consistently in the in-line tester, and presumably strong enough to at least jump across the spark plugs electrode... but still no spark across the plugs electrode.
Of course when I turn off the ignition switch, there is no spark in the in-line tester. Then when I turn the switch back on, it sparks in the tester.
I have no more extra coils to try on this saw, since I've sold all the McCulloch's.
Question: Is a moderate and consistent spark in the in-line tester enough to jump across the electrode of the plug, or can normal impedence in the spark plug inhibit any chance of a spark at the plugs electrode in the event the coil is weak?
.
I