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This one’s got me stumped

gustovh

gustovh

Forum Sage
Past Site Supporter
It seems no matter what I do I can’t bring #4 alive at idle.

The machine is my 80/1100L, been having intermittent ig failures until total failure and no spark. Fast forward a couple weeks and the old girl now has DynaS/3 ignition. The instructions call for holding the rotor at full advance and set to the advance mark for 1/4, done same procedure for 2/3 only no mark to set to so set to center of the marked 2/3.
I used the old wires going to the coils, switched 12v and command lines to both coils. I have instant start but only on 123/4 doesn’t fire, wet plug, checked for spark…dark dark dark. Changed coil, same same.1/2/3 run like Swiss watch, have done plug chops at 2500/3000/3500
#4 shows no life until 3000 or better. Changed the plug cap even.
It makes no sense, guess I’ll try another coil.

v
 
The old wires checked out, What doesn’t make sense is #1 is flawless, the coil is working but 4 is not firing.
 
Switch around the coil trigger wires and plug wires so that the coil firing 2/3 now fires 1/4 and visa versa. If the problem stays on 4 then you know it's not an ignition problem.
 
To add to Sandys post, if the problem follows to cylinder 1 try trimming the number 4 wire and screwing the cap into fresh wire. If that doesnt work try switching 1 and 4 caps. If swapping caps makes number 1 dead youve found a bad plug cap.
 
Replaced the cap with new, trimming wires is the first thing that I do. Will swap the 1/4 plug wires today to reconfirm #4 no spark.

V
 
So this is what happened today. I’m old with old eyes, so I decided to check for spark the old fashioned way, pulled the plug grabbed the spark plug and started the old girl. As soon as I touched the engine I knew I h ad spark and let go of it…..Thanks for the nudge Sandy.

Next I pulled the carbs, doesn’t take long even with airbox. I had run the carbs dry so pulled the float bowl, checked float height right on .900. Hmmmm removed the pilot jet plug, yup it’s there, remove the needle keeper and turn the bank of carbs upside down to catch the needle in my hand, caught it as well as the pilot jet that had worked itself completely loose. The light was lit, no need to bore ya all with reassembly. Test ride tomorrow to eye doc.

V
 
WooHoo Vince. Had a similar thing a few years ago. After dicking around for quite some time I pulled the carbs and found the poorly tighten main jet sitting in the bottom of the float bowl.
 
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