Unscheduled Maintenance - Yamaha MM700A Manual

LUBRICATION, MAINTENANCE AND TUNE-UP
level
Coolant
Be careful during carbon removal toprevent
gouging or damaging underlying metal. Ex-
cessive force may damage parts.
NOTE
Excessive carbon buildup over a short time
may indicate an improperly adjusted oil
pump or poor quality oil.
1. Remove the exhaust system as described in Chapter
Five.
2. Remove the cylinder head (Figure 34) as described in
Chapter Four.
3. Rotate the crankshaft so the piston is at top dead center,
then remove carbon from the piston crown. Repeat this
procedure for the remaining pistons.
4. Rotate the crankshaft so the piston is below the exhaust
port, then remove carbon from the exhaust port. Use a
vacuum cleaner and remove any loose carbon from the ex-
haust port and cylinder. Repeat this procedure for the re-
maining cylinders.
5. Remove carbon from the cylinder heads.
6. Remove carbon from the exhaust system as described
in Chapter Five.
7. Wipe surfaces with a soft cloth moistened with solvent
to remove any carbon residue.
8. Reassemble the engine.

UNSCHEDULED MAINTENANCE

Check the following service items frequently and ser-
vice as required.
Engine Mounts and Fasteners
Loose engine mount bolts cause incorrect drive belt
alignment. Check the engine mounting bolts to make sure
they are all tight. Refer to Chapter Four. If the engine
mounts are loose, check the clutch alignment as described
in Chapter Ten.
Body Inspection
Repair or replace damaged body panels.
Body Fasteners
Tighten any loose body bolts. Replace loose rivets by
first drilling out the old rivet and installing a new one. A
pop-rivet tool and an assortment of rivets are available
through many hardware and auto parts stores. Follow the
manufacturer's instructions for installing rivets.
Check welded joints for cracks and damage. Damaged
welded joints should be repaired by a competent welding
shop.
Fuel Tank and Lines
Inspect the fuel tank for contamination, cracks and
abrasions. If the fuel tank is contaminated, remove and
clean it. If the tank is damaged and leaking, replace it. See
Oil Tank
Inspect the oil tank for cracks, abrasions or leaks. Re-
place the tank if its condition is in doubt.
Electrical System
Check all the switches for proper operation. Refer to
Chapter Six.
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