Rear cylinder head
1. Remove:
- camshaft sprocket cover
- tappet covers
2. Align: "T" mark (a) (with the stationary pointer (b)
a. Temporarily install the left crankcase cover without the pickup coil and stator coil.
b. Turn the crankshaft clockwise.
c. Align the "T" mark (a) with the stationary pointer (b) on the crankcase cover (left) when the rear piston is at TDC on the compression stroke.
d. Check that the rear piston is at TDC in the compression stroke.
e. The rear piston is at TDC on the compression stroke when there is clearance at both of the rocker arms. If there is no clearance then turn the crankshaft clockwise one full turn.
f. When to "T" mark is aligned with the stationary pointer the punch mark (c) on the camshaft sprocket should be aligned with the stationary pointer (d) on the cylinder head.
3. Loosen: bolt (camshaft sprocket) (1)
Note: Use the sheave holder (2) to hold the rotor.
Sheave holder: 90890-01701
4. Remove:
- timing chain tensioner
- gasket
5. Remove:
- bolt (camshaft sprocket) (1)
- camshaft sprocket (2)
Note: To prevent the timing chain from falling into the crankcase fasten a wire to it.
6. Remove: cylinder head
Note:
- Loosen the bolts and nuts in the proper sequence.
- Follow the numerical order shown in the illustration. Loosen each bolt 1/4 of a turn at a time until all of the bolts are loose.
Front cylinder head
Note: When removing the front cylinder head, repeat the rear cylinder head removal procedures. However, note the following points.
1. Align: "I" mark (with the stationary pointer)
Removal steps:
- Turn the crankshaft clockwise 290°.
- Align the "I" mark (a) with the stationary pointer (b) on the crankcase cover (left) when the front piston is at TDC on the compression stroke.
- When the "I" mark is aligned with the stationary pointer the punch mark (c) on the camshaft sprocket should be aligned with the stationary pointer (d) on the cylinder head.
- The front piston is at TDC on the compression stroke when there is clearance at both of the rocker arms.
