Yamaha DT125E 1977 Owner's Manual page 30

CAUTION: The carburetor was set at the
Yamaha factory after many tests. If the sett-
ings are disturbed without having technical
knowledge, poor engine performance and
damage may result.
Idling r.p.m. adjustment
Start the engine and warm it up for a few
minutes (normally, 1 or 2 minutes) at ap-
proximately 1,000 to 2,000 r.p.m., occasion-
ally raising to 4,000 to 5,000 r.p.m. for a
few seconds. When the engine responds quick-
ly, the warm up is complete.
Tighten or loosen the throttle stop screw as
required to obtain the specified engine r.p.m.
while watching the tachometer.
Standard idling r.p.m.
DT125E . . . 1,450 ~ 1,550 r.p.m.
DT175 E . . . 1,300 ~ 1,400 r.p.m.
1. Throtl
NOTE:
If the specified idling speed can not be obtain-
ed after performing the above adjustment,
consult your Yamaha dealer.
Inspection and adjustment of play in throttle
cable
Check play in turning direction of throttle
grip. The play should be 5 — 7 mm (0.2 —
0.28 in) at grip flange. Loosen the locknut and
turn the wire adjuster to make the necessary
adjustment. After adjusting, be sure to tighten
the locknut properly.