The fluid level has to be
between the top and bottom lines on the front of the battery. To adjust
this level, add distilled water. Don’t ever add battery acid to a
serviced battery.
Depends on the engine
For two-stoke engine, clean
spark plugs every 300km and change after every 5,000 km. For four-stoke,
clean them every 3,000 km and replace after every 15,000 km.