Yamaha WR250FM Valve lifter and valve cotter, Valve spring compressor YM-4019/90890-04019

VALVES AND VALVE SPRINGS

ENG

REMOVAL POINTS

Valve lifter and valve cotter

1.Remove:

•Valve lifter 1

•Pad 2

NOTE:

Identify each lifter 1 and pad 2 position very carefully so that they can be reinstalled in their original place.

2.Check:

•Valve sealing

Leakage at the valve seat → Inspect the valve face, valve seat and valve seat width.

Checking steps:

•Pour a clean solvent 1 into the intake and exhaust ports.

•Check that the valve seals properly. There should be no leakage at the valve seat 2.

3.Remove:

• Valve cotter

NOTE:

Attach a valve spring compressor 1 between the valve spring retainer and the cylinder head to remove the valve cotters.

Valve spring compressor:

YM-4019/90890-04019

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