Yamaha TDM850 1996 User Manual

Name: Yamaha TDM850 1996
Brand: Yamaha
Rating: 5 (1 reviews)

332 pages

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3-20

COMPRESSION PRESSURE MEASUREMENT

INSP

ADJ

NOTE:

CAUTION:

COMPRESSION PRESSURE MEASUREMENT

Insufficient compression pressure will result in

performance loss.

1. Check:

 Valve clearance

Out of specification  Adjust.

Refer to “VALVE CLEARANCE ADJUST-

MENT”.

2. Start the engine and let it warm up for several

minutes.

3. Stop the engine.

4. Remove:

 Spark plug caps

 Spark plugs

Before completely removing the spark plug,

use compressed air to clean the cylinder head

cover areas to prevent dirt from falling into the

engine.

5. Attach:

 Compression gauge

 Adapter

Compression gauge:

90890-03081

6. Measure:

 Compression pressure

Above the maximum pressure:

Inspect the cylinder head, valve surfaces, and

piston crown for carbon deposits.

Below the minimum pressure:

Squirt a few drops of oil into the affected cylinder

and measure again.

 Refer to the table below.

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