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3-26 DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE
Cylinder Head
Compression Inspection
•
After warming up the engine, stop the engine. Remove the spark
plug and connect a compression gauge to the spark plug hole.
NOTE
Connect the spark plug cap to the removed spark plug and ground
the spark plug against the engine body. Make sure that there are
no flammable substances in the surrounding area.
If the engine is equipped with an electric starter, make sure that
the battery is fully charged.
•
Fully open the engine throttle and the choke valve. Operate the recoil
starter or electric starter and read the maximum compression.
Compression (minimum)
with Recoil Starter: 290 kPa (3 kg/cm
2
, 42 psi)
with Electric Starter: 390 kPa (4 kg/cm
2
, 57 psi)
If the compression reading is lower than the minimum value given
above, refer to the Troubleshooting section in order to repair the
engine.
A: Installing the compression gauge
Disassembly
•
Remove the retaining bolts from the rocker cover and remove the
rocker cover together with the breather pipe.
•
Remove the rocker arm.
Bring the piston to the top-dead-center of the compression stroke.
This will allow the rocker arm to move freely (except FE350 and 400).
On the FE120, 170, and 250, loosen the lock nut on the rocker arm
pivot to remove the lock nut and the rocker arm pivot. Then, remove
the rocker arm.
On the FE290, 350, and 400, remove the E-ring, push the rocker shaft
towards the exhaust side, and remove the washer and the rocker arm.
•
Remove the pushrods.
NOTE
Mark the pushrods to prevent the intake and exhaust positions from
becoming interchanged during reassembly. This is not necessary
on the FE350 and 400.
1. Rocker Arm Pivot
2. Lock Nut
3. Pushrod
•
Loosen the cylinder head retaining bolts little by little, evenly in the
reverse order of tightening, to remove the cylinder head.
CAUTION
The cylinder head could become warped if the head bolts are
not loosened evenly.
To ensure the proper loosening sequence, refer to the tightening
sequence on the next page.
A: E-ring
B: Rocker Shaft
C: Rocker Arm
D: Washer