O.S. Engines 21VZ-B V-Spec - Manual (Page 28)

Fit 0 rings to the tank screws to
prevent bubbles.
Do not disconnect plug battery and wait until
r.p.m. become stable.
Too immediately disconnecting plug battery
Fuel in the tank extremely bubbled
Adjust the tension of clutch spring. Incorrect clutch release
Engine overheated Wait until engine is cooled.
Clogged fuel filter
Air cleaner and silencer inside is dirty.
Clean or replace fuel filter.
Replace cleaner element and clean inside silencer.
Deteriorated glowplug Replace glowplug.
Fill the tank with fuel. Insufficient fuel in the tank.
Engine fires intermittently but does not run.
27