Can I replace a JASO-MA oil with a JASO-MB oil?

A JASO MA lubricant can replace a JASO MB lubricant but not vice versa. MB lubricants are not designed to lubricate the clutch, so if a mistake is made, they can produce a series of problems, such as the clutch slipping, excessive friction, the system heating up, and ensuing degradation.

Related questions:

• How do I know if the lubricating oil of my motorcycle meets the JASO standard?
• Difference between dry clutches and wet clutches
• Can I use car lubricant in my 4-stroke motorcycle?