Yamaha WR250FM service manual Removal Points, Camshaft

CAMSHAFTS

ENG

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REMOVAL POINTS

Camshaft

1.Remove:

•Timing mark accessing screw 1

•Crankshaft end accessing screw 2

2.Align:

•T.D.C. mark With align mark.

Checking steps:

•Turn the crankshaft counterclockwise with a wrench.

•Align the T.D.C. mark a on the rotor with the align mark b on the crankcase cover when piston is at T.D.C. on compression stroke.

NOTE:

In order to be sure that the piston is at Top Dead Center, the punch mark c on the exhaust camshaft and the punch mark d on the intake camshaft must align with the cyl- inder head surface, as shown in the illustra- tion.

3.Remove:

•Timing chain tensioner cap bolt 1

•Timing chain tensioner 2

•Gasket

4.Remove:

•Bolt (camshaft cap) 1

•Camshaft cap 2

•Clip

NOTE:

Remove the bolts (camshaft cap) in a criss- cross pattern, working from the outside in.

CAUTION:

The bolts (camshaft cap) must be removed evenly to prevent damage to the cylinder head, camshafts or camshaft caps.

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