Stihl Contra 1106 ignition problem

[dolmenman1]

Advice needed! My Contra (which I was gifted and only recently got going) died on me yesterday. I thought it was fuel related so drained tank, replaced fuel etc. No go...not even firing.
Next I checked for a spark and there was none, so I bought a replacement plug. Still no go.
However, if I hold the HT lead almost touching the block, when I turn the engine, there appears to be an erratic spark. Have tested both plugs in a Husky 45 and both plugs sparking fine. The gap is supposed to be 0.5mm (half a millimeter?) which seems too narrow. The new plug is as it came out of the box.
This chainsaw has had a chip fitted (it looks like the Nova II one) to replace the points. I've ordered a new one of these from Germany but it will be a few days before it arrives. Could this be the problem or could it be the coil?

If I have to replace the whole ignition module, will I need a special flywheel removal tool for this saw and do I have to set timing etc?
I'm a complete novice with this type of saw (circa 1967 I've been informed) so any advice to get her running would be greatly appreciated.

 

[cookies]

try removing the ignition wire and inspecting it carefully for abrasions, I know I have replaced many ignition wires over the years from them rubbing the case until the center electrode was exposed.

 

[dolmenman1]

Thanks...I'll try to check that...

 

[dolmenman1]

Ok, I've checked everything and cand find no splits in the HT lead. Took the fan off and cleaned around points. It has a Bosch Coil fitted but I am waiting on the flywheel puller and a new chip arriving in the post, from Germany.
I've also ordered a complete ignition which is supposed to be all electronic.
https://shop.saegenspezi.de/electronic-ignition-fits-Stihl-070-090-Contra-AV-070AV
To fit this do I need to space this module with feeler gauge to the flywheel and does it have to be timed? Also does it remove the need for the chip?
https://shop.saegenspezi.de/ignition-chip-with-ground-wire-fits-Stihl-070-090-Contra
It already has the chip fitted (hopefully that's all that has failed..

 

[dolmenman1]

Replaced the "chip" and she fired up straight away...need to sort idling out and replace clutch springs

 

[mojo jojo]

I would convert back to original points

 

[dolmenman1]

Fair enough...Is there a particular reason? The original ignition is still there, beneath the flywheel. AFAIK the "chip" just bypasses them....I am just pleased to have her running again.

 

[mojo jojo]

Because its original and bulletproof. Just the other day I pulled out my 60 years old Contra that was sitting at least five years. Gave a few swipes over the points with 500 grid sand paper and it fired right up and ran like new.

 

[dolmenman1]

You are probably right...sharpened the saw (a 32" bar) and went to do some cutting and she died after about a minute...no spark...again.
Think the chip has blown. Why? wired it exactly the same as the last one.
I'm waiting on a flywheel puller for her, so I intend to remove the flywheel and see what's going on...I will try to restore the original ignition, if it's still there...I've a horrible feeling the woodruff key has given up and the flywheel has slipped...I'll probably be looking advice on setting the timing...