VALVE CLEARANCE, THROTTLE OPERATION,

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VALVE CLEARANCE

( Refer to the maintenance precaution. )

Excessive valve clearance will cause noise, and little or no clearance
will prevent the valve from closing and cause valve damage and power loss.
Check valve clearance at the specified intervals.

1. Remove the crankshaft hole cap and timing mark hole cap.
2. Remove the valve adjuster covers.
3. Rotate the crankshaft counterclockwise and align the T mark (1) with the
   index mark (2). Make sure the piston is at the top of the compression stroke
   by jiggling the rocker arms with your fingers. If they are free, the piston
   is at the top of the compression stroke. If they are tight, rotate the
   crankshaft 360° and re-align the marks.
4. Check the clearance by inserting the feeler gauge (3) between the valve
   adjusting screw (4) and valve stem.

   NOTE

   When checking the clearance, slide the feeler gauge from the inside out. Standard clearance: In. 0.05 mm ( 0.002 in ) Ex. 0.05 mm ( 0.002 in ) Adjust by loosening the lock nut (5) and turning the adjusting screw (4) until there is a slight drag on the feeler gauge. After tightening the lock nut (5), recheck the clearance.

5. Install all parts in the revers order of disassembly.

THROTTLE OPERATION

(Refer to the maintenance precaution.)

1. Check for smooth rotation of the throttle grip from the fully open to the
   fully closed position at both full steering positions.
2. Measure the throttle grip free play at the throttle grip flange. The standard
   free play shoud be approx:

   3 – 5 mm ( 0.12 – 0.20 in )

   To adjust he play , loosen the lock nut (1) and turn the adjuster (2).

IDLE SPEED

(Refer to the maintenance precaution.)

The engine must be at normal operating temperature for accurate idle speed
adjustment. Ten minutes of stop-and-go riding is sufficient.

CAM CHAIN ADJUSTMENT

( Refer to the maintenance precaution. )

When the cam chain is noisy, adjustment the tension in the following manner:

1. Start the engine and maintain it at idle speed ( 1,500 min^-1 ).
2. Loosen the lock nut (1) , and loosen the tensioner adjusting bolt (2) approximately
   one half turn. Tighten the lock nut.
3. If the chain is still noisy even after the above adjustment, loosen the
   lock nut (1) adjusting bolt (2) and the 14 mm sealing bolt (3) located
   at the bottom of the crankcase, and screw in the tensioner bolt (4) gradually
   with the engine running, until the cam chain becames quiet. After completing
   the adjustment, tighten the tensioner adjusting bolt (2) , lock nut (1)
   , and 14 mm sealing bolt (3) securely.

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