There was an thread here about adv it 1/2 key. Magnets must not care. It ran until it gets hot.
Sent from my C771 using Tapatalk 2
Sent from my C771 using Tapatalk 2
The pictures of this mod aren't accessible anymore. Does anyone have any pictures of a modded ignition unit ? Thanks!!Recently solved my Stihl 056 Bosch ignition problem. After visiting this and other websites looking for answers to the "it runs for about 20 minutes and then dies" problem, I discovered many people having the same issue. My saw finally quit firing at all. I'm sure someone has already posted this solution but i haven't seen it. It's fairly obvious that the bottom (detachable) portion of the ignition unit is the coil. Cut the jumper wire from the coil to the (epoxy filled) electronics, solder this lead to a 1118-400-1001 trigger unit lead (26.00 from stihl dealer), ground the module, and the ignition will fire, assuming that the coil itself is not the issue but rather the electronics. Strangely enough the saw still would not fire. Blaming the lack of combustion on ignition timing, I pulled the key out of the crankshaft and began rotating the flywheel a few degrees in either direction. Retarding the flywheel (clockwise) about half a keyway created the desired response. I undoubtedly need to fine tune the ignition timing, but the saw runs perfectly. I then removed the top (detachable) bosch trigger unit and bandsawed off the (epoxy filled) electronics in order to mount the new trigger unit properly.
Thanks very much! I have 2 045s and 2 056s so this mod will be essential for me in the future, as I love and use these saws. Thanks again.They should be on my old phone. I'll try to find them.
Just to keep this outstanding thread fully documented, could you post some pics of the setup as it exists today? The more detailed and plentiful the pictures the better!!!I have moved the module into the carb compartment since these pictures where taken. Fix works great and is simple. The trick is to advance the flywheel one key-width (counter clockwise). Just remove the key and rotate until the side of the flywheel keyway is even with the opposite side of the crank keyway. Tighten it down and dont worry about it. If the problem with the ignition is the coil then of course the fix is useless. I have seen a thread on this forum in which you can get a replacement ignition for these saws. Looks like it comes from germany and sells for 125.00. Sells on ebay from seller saegenspezi. The guy said he installed it and it fired right up. Hasn't cut with it yet. Looks sort of like what I ended up with if I would have put the trigger module in shrink tube.
Blind Hog moved his trigger module into the carb box and away from the flywheel magnets (a pic would be helpful ). Apparently, he didn`t have a problem before he moved it. He is using a quality Stihl part (1118 400 1001) which may help.I our shop in the 80's another mechanic and I ended up doing the same thing to an 056 to see if it would work,repair a $200 Bosch ignition with a $7 aftermarket part sold as Atom or Minitron-a little electronic module like the ones you are using.We hacksawed off the electronics in epoxy part and wired in the module,we didn't do anything with the timing and we got good spark,We were jubilant and had a cheap repair for the Bosch ignition so we repaired a few 056's that way.
The problem for us was they all soon died,especially after a faller raised hell on the phone,I had to drive in the shop truck 2 hours north in winter to the little town he was working from and install a new Bosch ign. at our expense, and I had to do the job on the shop's concrete floor not the workbench because he was mad. The Boss banned us doing that anymore.Another shop had been doing the same thing in Gorman-Rupp pumps and the little modules replaced an expensive ignition,but they all soon failed for him too after a while.
In the end we concluded this;
-The little electronic modules work great in most cases-Where the flywheel has it's magnets located in just one spot on the flywheel's circumference.
-The electronic modules will fire well but die after a short while when the flywheel of the ignition involved has magnets located all around it's circumference.(Like a Bosch type on 056)
I also back then put one of the little units on my friend's kid's Yamaha 80,replacing the points,it sparked well and ran great,but a week or 2 later it was dead,no spark,and it's flywheel had magnets all the way around.
I'm not trying to rain on your parade or anything and I'm hoping the newer models now have better electronics and your Bosch fixes will be good.I've got a new one to install in my old 275 Canadien.
But maybe just be cautious and see how the first few work out and note what type flywheel the motor has when contemplating installation...
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