http://safemanuals.com/user-guide-instructions-owner-manual/YAMAHA/PW80-2003-_E
manual
Read the user manual of bike and then concern your mechanic.
Your local library will have a shop manual.
Go towww.bajamotorsports.net for complete owners manual.
Yamaha made the first Yamaha dirt bike
if you have an owners manual tht would be really easy, if not... It depends on what year, you can look up the manual on how to do it by the year of your bike
The precise type of oil that a Yamaha TTR 90 dirt bike should use can depend on the year the bike had been manufactured ad should be listed in the manual for the bike. For a 2002 Yamaha TTR 90 bike, the recommended oil type is 10W-30 (when 10 degrees Fahrenheit or above) and 20W-40 (when 40 degrees Fahrenheit or above).
Read the user manual of bike and take the services of your mechanic.
you can find them in a 24 $ shop manual for the bike i suggest that if you are doing any work on this bike http://www.schoolfundstore.com/a/shoemark%20pete/yamaha%20xj650%20owners%20workshop%20manual/affnr=-2610/1850103534
You can find a repair manual for your bike by calling Honda customer service. You could also go in or call one of the dealers.
honda is a better motorcross bike (250 and 450) and yamaha is a better trail bike
The Yamaha YZF R1 motorcycle is a sports bike class motorcycle. The Yamaha YZF R1, like other Yamaha sports bikes, are available from authorized Yamaha dealers.