Stihl 045 super idling problem

[HarleyT]

Why do you have a capacitor?
Show us some pics of your ignition work.

 

[tntatro]

Why do you have a capacitor?
Show us some pics of your ignition work.

The saw with the capacitor is an 056 magnum. You can see pictures of that fix on the thread "Success, just repaired Stihl 045/056 Bosch electronic ignition". The only different thing I did was put the capacitor next to the carburetor instead of in the cylinder housing.

The 045 super that I am working on now has a Nova II module. That fix is simple, or at least it should have been but I'm having problems. On that fix you just cut the wire on the coil and splice it to a wire going to the module and another going to the switch. The module has a negative terminal for the ground wire. The picture here shows where I located the Nova module in the carburetor housing. I also had to file out a notch in the top cover for the wires.

 

[HarleyT]

Where are you grounding at?

Is it wired like this diagram?

 

[tntatro]

It's pretty much like that except since my module is located in the carburetor housing I run a wire to a screw on the cylinder housing.

 

[tntatro]

If you are doing this fix on an 056 then let me know how it goes. Although I would try to stay with the points if I could find the parts and if it's a Bosch electronic I would try the foggysail fix first. The successes I've had with the foggysail fix worked flawlessly without messing with the timing. I'm having a lot of trouble with this one but maybe it's just my coil.

 

[tntatro]

I tried switching my coil with another that failed the foggysail fix and it was the same. I also switched carburetors and nothing changed. I decided to put a points ignition in since I recently got a points flywheel in a box of parts. Upon disassembling I found that the switch wire had a small hole worn in it so there was a possible shorting problem.

It starts and runs normal now except it seems to flood a little at idle and runs rich. I switched the foam filter material with a Uni Filter and it improved. I have to turn the H needle to 3/4 from stop to get it to run nice at full throttle. It was also like that with the other ignition. I thought it was a timing issue but maybe not. I suspect it was running rich then leaning out a little during a milling cut because the new piston I put in is badly worn after only three cuts from testing it with the last ignition. I thought it was timing issues also. I had to turn the L needle in a little also to keep it from flooding at idle.

I guess now I'll test it and see how things hold up before replacing the piston. I'll fix the switch wire and give the Nova II ignition another chance on the next build. I may even try a different type of module.