Honda ST50 Shop Manual page 83

The timing is correct if the light becomes dim when both
marksalig.n.
7.
If
ignition timing is incorrect, loosen the contact
breaker locking screw and adjust the breaker point
gap. Increasing the gap will advance ignition timing.
Decreasing the gap will retard ignition timing.
8. Tighten the locking screw and recheck the ignition
timing.
9.
Messure the maximum point with a feeler gauge.
Replace the conlact breaker points if the timing
can
not be correctly adjusted while maintafaing a point
gap o£0.3- 0.4mm (0.012- 0.016 in).
10. ReconnecttheA.C.generatorwires.
II. Reinstallthegenerator cover.
9. CAM CHAIN ADJUSTMENT
I. Removethegearchangepedal.
Start the engine and allow it to idle.
2. Loosen the cam chain tensioner lock nut and tensioner
lock bolt 1/2 turn.
3. When the cam chain tensioner lock bolt is loosened,
the tensioner will automatically position itself to
provide the correct tension.
4. Tighten the cam chain tensioner lock bolt and lock
nut.
lnstallthegearchangepedal.
If
the cam chain is
still
noisy , perform the following
operation.
J. Loosen the cam chain tensioner Jock bolt and lock
nut.
2. Remove the 14mm sealing bolt located at the left
bottom side of the crankcase.
3. Screw in the tensioner screw gradually until the noise
ceases.
4. Tighten the tensioner lock bolt, lock nut and 14mm
sealing bolt.