- Coolant level low. Check coolant level as
described in chapter 1, if coolant is low, engine will overheat.
- Leak in cooling system. Check cooling system
hoses and radiator for leaks and other damage. Repair or replace parts as
necessary. (chapter 3)
- Thermostat stuck closed. Check and replace as
described in chapter 3.
- Faulty radiator cap. Remove cap and have it
- Coolant passages clogged. Drain and flush the
entire system, then refill with new coolant.
- Water pump defective. Remove the pump and
check the components.
- Clogged radiator fins. Clean them by blowing
compressed air trough the fins from the back side.
- Engine oil level low. Check and add oil.
(you don't need a manual for that, I hope?)
- Wrong type of oil. If you're not sure
what type of oil is in the engine, drain it and replace with the correct
- Air leak at carburetor manifold. Check and
tighten or replace if necessary. (chapter 4)
- Float level low. Check and adjust if
necessary. (chapter 4)
- Worn oil pump or clogged oil passages. Check
oil pressure (chapter 2) Replace pump or clean passages as necessary.
- Clogged oil lines. Remove and check for
foreign material (chapter 2)
- Carbon build-up in combustion chambers. Use of
a fuel additive that will dissolve the adhesive bonding the carbon particles
to the piston crowns and chambers is the easiest way to remove the built-up.
- Otherwise, the cylinder head will have to be
removed and decarbonized. (chapter 2)