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Chain Saw Collectors Vintage chainsaws and other air cooled gas engine saws, collecting and restoring.

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Sachs Dolmar Ignition Woes


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  #11  
Old 03-23-2016, 05:36:08 PM
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Default Re: Sachs Dolmar ignition woes

I did a preliminary check today to confirm the timing of the Bosch unit.
Spinning it with the variable speed drill it starts advancing at about 800 rpm. The drill maxes at 1650 rpm. I didn't put the degree wheel on it as I just wanted to confirm that it has an advance curve. T= TDC F= fire A= advanced.

Some of the caps came today. Another type also pulse rated should arrive Friday. Each has slightly different characteristics so I'll be busy testing for a while.
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Last edited by I like oldstuff; 03-23-2016 at 06:02:16 PM.
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  #12  
Old 03-26-2016, 03:35:00 AM
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Default Re: Sachs Dolmar ignition woes

thanks guys I have used the nova unit on the later o24/023 025 series saws when with some success but have never thought to use one on these units also I have ordered some capacitors to try the other method also thanks again for the info
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Old 03-26-2016, 11:19:18 AM
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Default Re: Sachs Dolmar ignition woes

On this Dolmar saw there isn't room to fit the cap mod in the flywheel area. I remote mounted it in the airbox where it's easy to access should it fail etc.

As the cap is oversized in capacity, volts and size compared to the OEM part I don't anticipate problems with it. But we all know how hacks go... If I find no joy I can always go to the Nova mod, thanks to Gurn. Soldered the wire to the trace and epoxied it for stability. I'd love to test it on a long run but there's nothing to cut around my house.
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  #14  
Old 05-29-2016, 11:52:51 PM
tntatro tntatro is offline
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Default Re: Sachs Dolmar ignition woes

Quote:
Originally Posted by bigGURN View Post
Good luck, let me know how it goes
Some seem to have luck with his method and others not so much, so I'd like to see how it works for you.
Thanks for showing this method. I have three attempts with the other method for the Bosch 056 ignitions. Two were successful and one was not. I will try this on the one that didn't work.

The first one I did was a little over a year ago and I've milled a couple dozen logs with it. It just failed today. I don't know what happened yet but it doesn't have spark. Strangely, I put that ignition in a different saw before it failed. This other saw had just fried an SEM ignition that was working in a different saw it was in just before I put the fixed Bosch in. Not sure if the saw could be causing problems. Went from 056 super to 056 magnum.

From what I understand from reading your posts, it is not necessary to cut off the trigger module if I want to locate the Nova II near the kill switch. Just remove the pickup and rewire as you have said. Would that be correct?
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Old 05-29-2016, 11:54:39 PM
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Default Re: Sachs Dolmar ignition woes

Correct. Mount it where you want.
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Old 06-04-2016, 03:32:07 PM
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Default Re: Sachs Dolmar ignition woes

I just did this fix using the Nova II module. The saw runs good but starts a little hard. I have to lock the throttle or pull really fast, even when it's warmed up. It also does not idle well under 2,500 rpm. It will stall. I tried three different carburetors so I don't think it is the carb. The coil mount is turned as far clockwise as it will go. It would not start when set on the timing mark or counterclockwise to the mark. It does run good though. Any ideas on why it's hard to start and won't idle under 2,500 rpm?
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Old 06-04-2016, 03:34:31 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Sounds like low compression.
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Old 06-04-2016, 07:25:46 PM
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Default Re: Sachs Dolmar ignition woes

I just tested the compression and it is 150psi but I looked in the spark plug hole with a flashlight and it appears to be all scored up in there. I just built this and another 056 magnum. This one I've been having trouble with. It seems to be running too hot. The first two ignitions I put in got fried, both on the first milling cut. I just made a cut with this ignition in and it held up but the saw still seemed a bit too hot. The only different thing I did with this saw than the other 056's I've messed with is put a .2 mm cylinder gasket in and ductile split groove piston rings. Well, it's likely that it is not the ignition.
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Old 07-17-2016, 01:10:39 PM
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Default Re: Sachs Dolmar ignition woes

I have tried this fix on a Stihl 045 super and it starts and runs but the chain wants to advance. I replaced the clutch springs, checked for air leaks and rebuilt the carburetor. The saw performs nicely but it doesn't seem quite right. Even at 2,300 rpm the chain still will advance slightly. Any ideas on why it won't idle properly?
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Old 07-17-2016, 01:22:49 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Have you adjusted the idle screw? It might be that the timing is slightly advanced, but I'd suspect an air leak or too high if an idle setting or low speed screw setting.
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