known bugs ?

[Nachodaddy]

Thanks a lot Ferret, is the idle issue immediately apparent when checking out the bike ? or does it show itself only under conditions hard to reproduce ?

I bought my 2013 in September, 2020 with 4525 miles on it, from a private party. It was in beautiful condition and ran perfectly. It had not had any modifications to the engine, like ECU flashing or performance chips or a Power Commander. Within less than 100 miles, the idle problem started. At first, after riding a few miles, when I stopped at a stop sign or traffic signal, it would idle down to 500rpm and, when I twisted the throttle to go, it would die. It would continue to do this until I revved it up and slipped the clutch to get some speed up. It stopped me in the middle of the intersection a couple of times, which is no fun in Phoenix traffic. Drivers here are not forgiving. I don't have exact dates, but before long, the high idle problem started. I would start normally, drive off, but at the first stop, the idle would go to 2000rpm. After the high idle started, the low-idle never returned. From then on, the bike would only idle at 2000rpm. The one exception is that I could dis-connect the Throttle Position Sensor (TPS) and it would run fine and idle at 1100rpm, but would not rev higher than 5000rpm.
I read everything I could find on the Forum about the problem, a lot of it I did not understand. One person claimed to have solved his problem by changing the sparkplug wires and coils. I have a spare set I bought used on EBAY if you want to send me $90 for them. Didn't work. Most others agreed that the Intake Control Valve was at fault. Bought one and had it installed. Didn't work.
To make a very long story shorter, Power Dubs recommended changing out the Electronic Control Unit (ECU). By then I was tired of throwing money at it and didn't want to spend over $700 only to find out it wouldn't work, so I waited. Then a member in South Korea described the same problem and said his Honda mechanic put in a new ECU and the problem went away. So, I decided to try it. I ordered a new replacement from Partzilla for $478, which was over $500 with tax, etc., and installed it myself. The bike runs fine since then. I believe that was in about last September.
The link for the part I bought and installed is:
https://www.partzilla.com/product/honda/38770-MGC-A24
A temporary fix that I found useful was to disconnect the battery leads and connect them together for 15 minutes. Make sure they do not touch the battery terminals during this time. I don't know why it works, but it worked for me. I now have over 6200 fun miles on the bike.
Good luck and I hope this has been useful.