Ax-man
Addicted to ArboristSite
I am bringing this thread back up because I hope it catches Lake's attention if he is still here or another 056 expert concerning the history of the ignition systems used in a 56.
Today I recieved an odd request to look a saw that didn't run right from a tree customer of mine. My jaw dropped when they came over with it. An 056 AV in mint and I mean mint condition that = 's pristine that it looks like came right from the dealer's shelf. Original Duromatic bar and probaly the same chain it came with.. The chain sprocket didn't even have a nick in it.
Anyway, the saw starts and runs but runs like the ignition is cutting out and sounds like it is out of time. Very similar to the way a saw would run if the lead wire was shorting out to the case or a point ignition saw would run with the points out of adjustment or had a bad condenser or the on-off switch wasn't working right.
I have tinkered with what little timing adjustment the module has as shown in this thread about halfway back around page 11. Didn't make much difference in the way it ran. I have also gone throught the carb making an adjustment mostly in the height of the metering lever. The setting was real high. That didn't work much either although the saw did run a little cleaner.
This saw is in way too good of shape for any of the usual old saw problems concerning a running ignition problem. This saw was so clean under the flywheel I could read Presto on the spark plug wire,don't see that too often.
My question is how reliable were these early capacitor dicharge modules???
This one is a Bosch with the orginal two piece flywheel just like the one Lake put in the 56 that is the theme of this rebuild thread. Did these modules have a history of premature failure?? I got a feeling the one I have is failing internally somehow.
Also, what does SEM stand for ??? I'll take a guess at Seimens Electronic Module.
I'd like to fix this saw for the lady but I know these modules are no longer available from Sthil and it would gut me to put a used module in such a nice looking saw.
AX or Larry
Today I recieved an odd request to look a saw that didn't run right from a tree customer of mine. My jaw dropped when they came over with it. An 056 AV in mint and I mean mint condition that = 's pristine that it looks like came right from the dealer's shelf. Original Duromatic bar and probaly the same chain it came with.. The chain sprocket didn't even have a nick in it.
Anyway, the saw starts and runs but runs like the ignition is cutting out and sounds like it is out of time. Very similar to the way a saw would run if the lead wire was shorting out to the case or a point ignition saw would run with the points out of adjustment or had a bad condenser or the on-off switch wasn't working right.
I have tinkered with what little timing adjustment the module has as shown in this thread about halfway back around page 11. Didn't make much difference in the way it ran. I have also gone throught the carb making an adjustment mostly in the height of the metering lever. The setting was real high. That didn't work much either although the saw did run a little cleaner.
This saw is in way too good of shape for any of the usual old saw problems concerning a running ignition problem. This saw was so clean under the flywheel I could read Presto on the spark plug wire,don't see that too often.
My question is how reliable were these early capacitor dicharge modules???
This one is a Bosch with the orginal two piece flywheel just like the one Lake put in the 56 that is the theme of this rebuild thread. Did these modules have a history of premature failure?? I got a feeling the one I have is failing internally somehow.
Also, what does SEM stand for ??? I'll take a guess at Seimens Electronic Module.
I'd like to fix this saw for the lady but I know these modules are no longer available from Sthil and it would gut me to put a used module in such a nice looking saw.
AX or Larry
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