Mike D
ArboristSite Lurker
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- Aug 25, 2014
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hotshot can you tell me how you check the timing on the flywheel side.
Here is the number for Mouser Electronics Capacitor. Vishay part #594-2222-378-52105 series 378 mkp. This is 1uf pulse rated @ $2.89. mobile_bob that is the replacement for a points system.
Any help on setting the timing on my 45 Super? I followed your instructions on this fix, and can't get my saw to crank. Have spark (felt with finger) but no fire. I have good fuel. I don't know where to begin on adjusting the assembly. Getting tired of tearing the thing apart every time it doesn't work.View attachment 348024
I forgot to show how the ignition looks and how I ran the wires. ALSO--- I FORGOT TO MENTION THAT HOLE YOU DUG OUT OF THE POTTING, FILL IT WITH EPOXY OR YOUR CAULKING STUFF. And be sure that yellow wire is tight and not loose where it can hit the flywheel.
Again-- best of luck----
Foggy
The specs I have say 2.7mm(0.108 in.) before TDC. Is that the same as 26 degrees? I finished timing my saw, and still no fire. Have good fuel, and have no bad ground wire. Maybe my coil isn't putting out enough spark? How much should it put out?Mike, it's a royal PITA but here's how I do it on the 045/056 saws. Get another person to help, because you'll need three hands. Watch your fingers around the fins when you're spinning it, as you have to hold the saw down and run the timing light and run a drill or air tool all at the same time...
Start by finding TDC with a piston stop & mark the flywheel and case for TDC, anywhere convenient. Move the FW slowly back and forth, make a light mark at both the stops, and the TDC is exactly in between. I use white chalk on the FW, so the marks are probably 2° wide or more...but I can see it. Back the FW off (CW) 26° with a mounted degree wheel, and then mark the case again for the 26° BTDC point, using the one mark on the FW. You can also print a reduced size degree wheel off on paper, then cut it out & center it over the FW nut to get really close. Tape it down on the sides to get to your 26° BTDC mark, then tear it off.
Get a timing light and hook it up to a 12V battery and the saws spark plug wire. Pull the plug, ground it (I use a clip on spark tester), then turn the kill switch ON. Make sure the choke is OFF too.
Take a drill and spin the FW nut CCW at the drills top speed (drill put in reverse) and then check the FW & 26° marks alignments with the timing light. Remember to torque the FW nut down hard before, or you will just spin it off.
If the FW mark is showing/strobing below (before) the 26° case mark then you are advanced, and if it's above (after) it you are ********. Adjustments are like most Chevy distributors, so loosen the screws and barely move the stator CW to advance, or CCW to ****** it. The later timing lights have a degree dial on the back, but mine is old school. Mark the stator plate edge and the case with a punch when you get it set, so you can put it right back if you take the coil off later.
Stihl service manual states that the saw should be running at 6000 RPM or better, but these old ignitions have no auto advance features. They also check it on the clutch side with a bar stud mounted fixture, but you're going to be popping the flywheel off & on for final adjusting, so why not have the starter cover already off?
Technically, there will be less of a delay on sparking the faster the saw runs, but using a drill has always been accurate.
I'm not getting enough spark to fire my saw. I used Hotshot's method on the timing, and had enough spark to run my timing light. Put everything back together and can't see any spark on my plug. My bosch unit has "2 204 211 040" stamped on the coil. Is the coil possibly the problem? I have a spare on hand, is there a good way to test the spare to possibly replace the one on my saw with?Hotshot has posted how to time these saws, I avoided timing mine because it was a BPITA job. I just set the ignition assembly to the mid point and things seem OK. The first setting I made I had the timing too ********. Saw ran for awhile and then back fired through the carburetor along with blowing off the muffler.
If you have the capacitor fix behind you, MAKE SURE the shut down wire has insulation on it or it can/will short and prevent starting. I cut mine off. Also the crappy switch used for shut down has a high failure rate. Mine failed open meaning it will not shut off the engine, possible I guess they can fail shut which will kill the spark. I use the choke to shut my saw down.
My capacitor http://www.ebay.com/itm/111284585730?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT it's hard to read the markings but this is what it looks like: 47n J 630v 378 MKP/MKP on the side it says BC HQ 0026Dan--
Tell us about your capacitor. What is marked on it and where did you get it from. As to the coil (high voltage pulse transformer) itself failing..... anything can fail. But the big 'but' here is the common failure is the capacitor. If you did everything as described here in the thread including using the capacitor or a suitable type and value, your ignition should work.
Did you cut off the wire dedicated for the shut down switch?
And as to testing..... I highly recommend NOT securing the flywheel other than tightening the holding nut just enough to pull the starter rope with the plug removed. And a silly question.....is the flywheel half moon key (I forgot the correct name for the thing) in place? After you get a strong spark, then and only then should you sock the thing together.
Also make sure the spark plug wire fits properly into the coil. In general, check your workmanship. To my knowledge yours is the first not to get up and go after the fix
Just installed the right capacitor, and fired right up! I need to wait until everything dries before I can work the saw. Sounds good though. Thanks again!Dan--
Did you read thoroughly how to install and what is needed for the fix?????
Your capacitor is a 0.047ufarad! A 1 ufarad or close that value is needed. YOU PURCHASED THE WRONG CAPACITOR!
Send a PM to me with your address. I will send a proper capacitor to you. And FOLLOW the modification directions!
Good job! You would have been just fine if you had stacked up 22 of those caps in parallel!
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I know that remark wasn't very nice, but it's true!HOTSHOT!!!
I JUST DID A BELLY ROLL while reading your post! I just gave you an "attaboy"
Foggy
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