I have another MC21.
It sit in my garage for half year like my MC28.
When i kick start the bike, it starts on just bottom cylinder.
The top cylinder is like something choke up, like not firing correctly.
First i thought it may be the spark plugs, so I replace a new ones.
Then i start it again, it still the same problem occurred.
Is the top end need to be replace, or the card need to be clean?
It is running pre-mix.
thanks