Yamaha DT125 R 1988 pickup and source coil testing specs (for a no spark condition, may apply to other years)
Yamaha DT175 D 1992 pickup and source coil specs (for a no spark condition, may apply to other years)
Yamaha MX360 MX250 (M100-08) and SC500 (F145-01) Magneto Coil resistance testing specifications. Readings should be within 5% +/- outside of this range could result in a "no spark" situation coils must be replaced.
Yamaha SC500 MX360 MX250 wiring diagram
78-79 Yamaha XS1100 Special, Midnight Special carburetor specifications XS Eleven
80-81 Yamaha XS1100 carburetor specifications XS Eleven Special