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Post by cutandstack on Mar 22, 2019 13:08:33 GMT -5
My 550 was running great and then suddenly died, I was not able to get it restarted. My thought is to check the transformer (part A-12299-A or ignition module 12669-A)with the multi meter but I'm not sure what numbers I'm looking for. Any help on numbers or tips on what else to check?
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Post by undee70ss on Mar 22, 2019 14:16:10 GMT -5
Check spark plug first? Saw still have compression? Suddenly dying is usually only one of 3 things, no fuel, no spark, or loss of compression.
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Post by cutandstack on Mar 22, 2019 15:35:08 GMT -5
Compression is at 115, I bought a new spark plug and will give it a try.
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Post by edju1958 on Mar 22, 2019 15:51:18 GMT -5
I believe the compression being at 115 is your answer.That's just too low for a 550 to be able to fire anymore.I think you're in need of new rings at the least. Ed
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Post by onlyhomelites on Mar 22, 2019 16:17:23 GMT -5
You can check the coil with a little hill-billy trick I picked up from a Chainsawguy video. Take the transformer off and spark plug out. Wet two fingers and place one on each contact. Crank the saw over (preferably with a variable speed drill) and you should feel a tickle of current. This won't blast you like a car ignition, but you should be able to feel something.
If this tests good, you likely have a bad transformer. 115PSI is pretty low for a 550, but it should at least pop on a prime. Have you tried squirting a bit of oil in the cylinder to see if the reading comes up at all?
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Post by undee70ss on Mar 22, 2019 16:35:14 GMT -5
I believe the compression being at 115 is your answer.That's just too low for a 550 to be able to fire anymore.I think you're in need of new rings at the least. Ed
The range for 550's is 125-155. A little low but enough to run. Now on a different saw, like a 450, 115 would be really low.... |
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