Honda TRX300EX Owner's Manual page 234

The following is a brief, but important collection of information you
need to know about your Honda. You'll also find space to record
important notes.
How To Avoid Costly Repairs
The engine of your Honda can be the most expensive component to
repair. Proper maintenance, especially the use of the recommended
fluids and filters, prevents premature wear and damage.
Frequent causes of costly repairs are:
Engine oil: insufficient quantity, improper oil.
Air cleaner: dirty, leaking because of improper installation (poor seal).
Record important information on the following page:
Quick Reference
Quick Reference