Hello from sunny Brisbane, Australia. I've got a MC21 SP that I've had sitting in the garage a few years. It's an absolute hoot to own and ride!

It has developed a bit of a quirk recently. At low revs/idle the bottom cylinder is dropping out. I've just serviced the carbs thinking that was the issue and it has made no difference at all.

I've replaced the plugs on both cylinders.

It has aftermarket coils that the previous owner put on there, I'll test those later in the week.

Everything else is pretty stock.

Keen to find out if anyone else has had similar issues and what you've found to be the issue/solution?