Question: 22-year-old motorcycle starts and runs for 10min then stalls and won’t start. Months later, the motorcycle starts and runs for 10min then stalls and won’t start again. It is Not an electric issue the battery is holding a charge and clicks with a loud click.
Once and a while it will almost fire, but then it won't for days.

When in neutral the wheel hangs up ever 1/8 to 1/4 of a turn. Changed the oil back to the OEM oil because the shop I took it to said the OEM oil looked too thick. I was thinking that the oil for my motorcycle has to be thicker to avoid seizing. I am at a loss and need some help.

I have been told it may be that the carbs need to be cleaned and rebuilt.

I am open to any ideas before a drain the tank and open her up.