Basically, all the symptoms of a bad pickup or ignition coil. Bike revs fine up to nearly 1/2 throttle. Then it hits a notable level and cuts out and sputters pretty hard. This happens either on the stand or while riding. When riding, I can feather it to about 30mph on a thinline before cutting out and hard sputtering if I go over the line. The cutting is hard, which makes me think electrical. However, the lights do not flicker when it’s cutting out.
I’ve seen this before: changed ignition coil and back to rippage. Not so this time. What I’ve done (essentially replaced every electrical part on the bike):
~~ NOTE: stator is Treats CDI~~
- upgraded pickup coil to motobecane version
- upgraded ignition coil to motobecane version
- Replaced the 2041 Pietcard Box with new
- Replaced external coil with pietcard version
- Replaced plug wire and boot on ext coil
- Varied spark plug gaps
- Checked and quick cleaned carb
After replacing all these parts, I still get the issue so I hooked up to a timing light. Everything starts out normal. I see my line auto advancing, as it is supposed to do initially, then when I reach a certain RPMs (about half 1/2 throttle), the line just completely vanishes and the cutting out begins! I’ve read some people talk about their fire mark jumping a complete 180 degrees but I haven’t confirmed that in my case since that would put the fire mark underneath the flywheel and I’m all solo with no help.
I have not tried adjusting the timing yet as I see no real reason it could have gone from just fine to all fucked up in a moment. Any ideas, insight, personal experience would be greatly appreciated. I just can’t fathom wtf could be the problem here. I’m convinced it’s electrical; but I’m open to your thoughts.
Thanks guise! (If I haven’t already, I’ll try to come back and add a YouTube link)