JASO MA

In many 4-stroke motorbikes, the motor oi lubrcates the transmission and clutch as well as the engne. If a car grade motor oil is used clutch slipping may occur at high power loads. But if you see the JASO MA specification on the oil container, you can be sure that the clutch will always bite.

Motorcycle engines place different demands on motor oils than do passenger vehicles. In the case of passenger vehicles, the focus is on fuel economy and extended oil hange intervals, factors that by the nature of things are not important with motorcycles. On bikess, engines offering increasingly higher torques and RPMs are being used to genertae more and more power. And this is where oil additives are causing the wet clutches used on bikes to slip.

JASO MA Offers an answer

In response to the requests from leading motorcycle manufacturers, the japanese Automobile Standards Organisation (JASO) has introduced JASO MA and MB, the first specifications to apply solely to motor oils for 4-stroke motorcycle with wet clutches. These standards set additional lubricant requirements beyond the spark-ignition motor oil grades defined by API or ACEA.

The JASO T 903 bench test determines coefficients of friction under various operating conditions compared with the reference oil. The results allow oils to be divided into two catagories:

MA = Non Slipping Oil
MB = Slipping Oil

Coefficient of friction measurements that conform to MA requirements guaruntee that clutch slipping will not occur under any load condition on even the most high performance racing bikes. These values are therefore specified by leading motorcycle manufacturers.

The JASO MA trio

MOTOREX offers three MA compliant products with different base grades and viscosities:

Power Synt 4T SAE 10W/60, 10W/50, and 5W/40
Fully synthetic, high performance motor oil. Delivers optmum wear protection, extreme temperature and shear stability, and uncompromising clutch bite. Race tested.
Top Speed 4T SAE 10W/40 and 15W/50
Synthetiv high performance motor oil. Minimum evaporation losses (NOACK) reduce oil consumption. Prevents wear and ensures smooth clutch engagement and easy shifting.
Formula 4T SAE 10W/40 and 15W/50
The highest possible quality using conventional base oils. Temperature stable and absolutely stable in lubricating applications, prevents wear.

And just by the way: all the above products are ideal too for 4 stroke motorcycles with seperate transmissions, such as BMWs and Harley Davisons.