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Pressing the lower button will put you in set mode and toggle you through each setting (hour, minute, second, month, data), the upper button allows you to scroll through the numbers for each setting.  You can tell you are in set mode when only one of the numbers (like hour or minute) are displayed.  Don't feel bad, the translated English manual is unintelligible in places, and this is one of them. Even when set my clock loses a few minutes each month, but still handy on a ride since I really lose track of time.  I ride motorcycles too and it still amazes me how much fun this thing is to ride.

The manual for my Agility 125 calls  for a SAE 90 weight gear oil, but at the local auto parts stores all the gear oils were multi-viscosity.  I went with the Castrol Hypoy C SAE 80w90 gear oil as that seemed closest to a straight 90, and Castrol generally makes good products.  Any issue with using 80w90?  If so what alternatives are available and where do you get them?

The two things synthetic oil is better at is longevity and heat tolerance.  Since the Agility 125 does not have an oil filter we cannot take advantage of the longevity synthetic oil provides because we have to change the oil to get rid of the solids a filer could remove.  With an air cooled engine the heat tolerance can come into play depending upon your local climate.  I’m in Texas and its 107 F today so yes I can benefit from synthetic oil.  Long term test have shown there is no benefit to changing your oil more frequently than the manufacturer recommends.  This last bit is going to inflame some folks but it’s been proven in extensive studies, the most notable one done by Consumers Union.