Honda says both SG or higher AND JASO MA. You say Shell says they don't meet JASO MA. Look at the Honda 4 stroke oils. They say API SJ AND JASO. I know of no motorcycle manufacturer or oil manufacturer that lists API SM AND JASO MA. Look at the Honda 4 stroke oils. They say API SJ AND JASO. The two (API SM AND JASO)seem incompatable or not preferred or surely someone would list both. I also don't see CJ+4 listed by any motorcycle or motorcycle oil manufacturer.
CJ+4 is backward compatable to trucks using CI+4, but because CJ+4 is more expensive, lower TBN and is not recommended for extended oil changes, I don't know of many that use it unless it is specified for the 2007 and newer trucks.
Simply ask Shell if they meet the clutch friction performance for JASO MB, JASO MA, JASO MA1 or JASO MA2 or ask them the results and what test they use. Ask them for the foam test results too. They may not tell you any of this due to confidentiallity, but never hurts to ask. Ask them if they recommend their CJ4+ oil for motorcycles that use the same oil in their transmissions and wet clutches and if they'll pay for any damages resulting from their recommendation.
As far as foaming, the higher operating speeds and gear systems in motorcycles increase the need for good foam control, even more so than in a truck. There are several anti-foam additives used, silicones are one.
CJ+4 is backward compatable to trucks using CI+4, but because CJ+4 is more expensive, lower TBN and is not recommended for extended oil changes, I don't know of many that use it unless it is specified for the 2007 and newer trucks.
Simply ask Shell if they meet the clutch friction performance for JASO MB, JASO MA, JASO MA1 or JASO MA2 or ask them the results and what test they use. Ask them for the foam test results too. They may not tell you any of this due to confidentiallity, but never hurts to ask. Ask them if they recommend their CJ4+ oil for motorcycles that use the same oil in their transmissions and wet clutches and if they'll pay for any damages resulting from their recommendation.
As far as foaming, the higher operating speeds and gear systems in motorcycles increase the need for good foam control, even more so than in a truck. There are several anti-foam additives used, silicones are one.