Inspect the camshaft sprocket in the following procedures:
If they are worn or damaged, replace the sprocket/ camshaft assembly and cam chain as a set.

Camshaft inspection
Cam chain tension adjuster inspectionSpecial tools and equipment
Recommended service material
Note
required service material is also described in the following.
“Starter motor components”
Special tool
...
Engine top side assembly
Assemble the engine top side in the reverse order of
disassembly. Pay attention to the following points:
Cylinder head
Install the dowel pins and a new cylinder head gasket
(1) to the cylinder.
Caution
use a new gasket to prevent gas leakage.
Place the cylinder head ...
Throttle valve synchronization
Check and adjust the throttle valve synchronization
among four cylinders.
Start the engine and run it in idling condition
for
warming up.
Stop the warmed-up engine.
Lift and support the fuel tank. Refer to “fuel
tank
removal and installation” in section 1g (page ...