- OUT OF PRINT -
The 1978-1990 Yamaha YZ50, YZ60, YZ80 Monoshock motocross bike repair manual by Clymer, covers the following dirtbike models:
Book Excerpt: 1978-1990 Yamaha YZ50, YZ60, YZ80 Monoshock Repair and Service Manual
- Yamaha YZ50, 1980
- Yamaha YZ60, 1981-1982
- Yamaha YZ80, 1978-1990
ENGINE LOWER END
This chapter describes service procedures for the following lower end components:
FUEL AND EXHAUST SYSTEMS
Prior to removing and disassembling the crankcase, clean the entire engine and frame with a good grade commercial degreaser, like Gunk or Bel-Ray engine degreaser or equivalent.
- Connecting rod.
- Transmission (removal and installation).
- Internal shift mechanism (removal and installation).
It is easier to work on a clean engine and you will do a better job.
Make certain that you have all the necessary tools available, especially any special tool(s) and purchase replacement parts prior to disassembly. Also make sure you have a clean place to work.
It is a good idea to identify and mark parts as they are removed so that errors will be avoided during assembly and installation.
Clean all parts thoroughly upon removal then place them in trays or boxes with their associated mounting hardware.
Do not rely on memory alone as it may be days or weeks before you complete the job. In the text there is frequent mention of the left-hand and right-hand side of the engine.
This refers to the engine as it sits in the bike's frame, not as it sits on your workbench.
CARBURETOR SERVICE (1978-1982)
Major carburetor service (removal and cleaning) should be performed after every race on competition bikes.
On a bike that is used for fun on weekends, it should be performed whenever the engine is decarbonized or when poor engine performance, hesitation, and little or no response to mixture adjustment is observed.
The service interval time will become nature to you after owning and running the bike for a period of time.
Subject: 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990 Yamaha YZ50, YZ60, YZ80 Monoshock service, maintenance, repair. ISBN-10: 0892874953 | ISBN-13: 9780892874958 | Clymer M393