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

Chain Saw Collectors

Sachs Dolmar Ignition Woes


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  #31  
Old 08-11-2017, 03:11:04 PM
Northmen Northmen is offline
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Default Re: Sachs Dolmar ignition woes

Hey so I figured out that it is probably not the coil I tried all the settings of the bakingplate plate, and again no life at all! So i have no idea what to do know.
I cleaned the carb so thats also not the problem I think. Does someone have a good idea what I can try because i have no idea anymore. Thanks
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  #32  
Old 08-11-2017, 03:13:56 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

How's compression?
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  #33  
Old 08-12-2017, 03:09:13 PM
Northmen Northmen is offline
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Default Re: Sachs Dolmar ignition woes

Really good i need to pull really hard and keep the saw with my foot on the ground.
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  #34  
Old 08-12-2017, 05:32:27 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Have you tried putting fuel right down the throat of the carb a d then starting it?
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  #35  
Old 08-13-2017, 04:25:32 AM
Northmen Northmen is offline
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Default Re: Sachs Dolmar ignition woes

Yes even with starter gas but nothing!
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  #36  
Old 08-13-2017, 08:03:15 AM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Try changing out the sparl plug, make sure its not fouled
If you have air, fuel, fire, it should run
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  #37  
Old 08-13-2017, 03:50:20 PM
Northmen Northmen is offline
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Default Re: Sachs Dolmar ignition woes

I changed the spark plug for a new one, wat do you mean with fouled? And how precise dose the baking plate of the coil listen every mm or even les than that?
I olso checkt the piston if it is not damage by the exhaust. Is there something else what can be the problem? It is quite a simple engine but I have no idea anymore
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Old 08-13-2017, 04:00:25 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Timing can be very exact on these small engines. Did you mark the backing plate before you removed? Most every saw I've done would start in the stock position, some required minor (i.e. mm) of adjustment to fine tune how they would run. A couple, like the first, was extreme in what it took to run, but after years of doing this, that seems the extreme and not the norm.

If you have good compression (nominally 100psi, preferably 125+psi) and you are getting fuel with correct ignition timing, it should run. So, if you currently have adequate compression, you know you are getting fuel (i.e. the plug is wet) and you know the sprak plug is hot and you are not losing spark, it is a timing issue.
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  #39  
Old 08-13-2017, 04:16:44 PM
Northmen Northmen is offline
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Default Re: Sachs Dolmar ignition woes

It is also so strange that the saw stopt how he did before when I was using it. And that since then there is no life at all anymore that is strange. I tried to start it but it did nothing and after a while I installed the nova2 because I thought it is the coil

---------- Post added at 10:14:16 PM ---------- Previous post was at 10:07:04 PM ----------

I didn't know that the plug needs to be hot,is that because of the spark? I can check the carb again for the fuel. If the carb is not working what is most of the time the problem?

---------- Post added at 10:16:44 PM ---------- Previous post was at 10:14:16 PM ----------

Ooh and how do you know the stock position Of the baking plate? Because I didn't mark it it is a little bit stupid I know!
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  #40  
Old 08-13-2017, 04:18:07 PM
bigGURN bigGURN is offline
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Default Re: Sachs Dolmar ignition woes

Did the saw have spark before you started working on it? If so, then you probably didn't need to do this mod...

By a "hot plug" I mean that the spark plug produces adequate spark to ignite the fuel air charge in the cylinder.

If you are pulling on the saw repeatedly, and its not starting, you should have a flooded saw, therefore the spark plug will be wet with fuel.

If this is not happening, you are not getting fuel to the cylinder. At this point, start by checking fuel lines and filters, then consider rebuilding the carburetor. It may have a blocked passage, a damaged diaphragm, an incorrect adjusted jet screw, or any combination of the above.
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