Air Screw Adjustment; Idle Drop Procedure; Initial Opening; Idle Speed - Honda 2000 XR50R Service Manual

FUEL SYSTEM
Tighten the carburetor top securely_
After installing the carburetor, check for the follow-
ing:
-Engine idle speed (page
3-11)
- Throttle grip free play (page 3·4)
AIR SCREW ADJUSTMENT
5-10
IDLE DROP PROCEDURE
When the engine must
be
running
to do some
work, make sure the (Jrea is weJf-ventil.tctd. Neve'
run the engine in an enclosed area. The exhaust
contains poisonous carbon monoxide gas that may
cause loss of consclous",'55 lind Iliad to death. Run
the engine in an open ares or with an exhaust
Bvacuerion system in an enclosed ar ••.
NOTE:
• The air screw is factory pre-set. Adjustment is not
necessary unless the carburetor is overhauled or
new air screw is installed.
• The engine must be warm for accurate adjust-
ment. Ten minutes of stop-end-go riding is
sufficient.
• Use 8 tachometer with graduations of 50 rpm or
smaller that will accurately indicate 50 rpm
change.
1. Turn the air screw clockwise until it seats lightly.
and then back it out to the specification given.
CAUTION :
Damage to the air screw .seat will occur if the air
screw is tightened ega/nst the seat.
INITIAL OPENING: '-1/2 turns out
2. Warm the engine up to operating temperature.
3. Stop the engine and connect a tachometer ac-
cording to the tachometer manufacturer's instruc-
tions.
4. Start the engine and adjust the idle speed with
the throttle stop screw.
IDLE SPEED: 1,700
±
100 rpm
5. Turn the air screw in or out slowly to obta in the
highest engine speed.
6. Lightly open the throttle 2-3 times, then adjust
the idle speed with the throttle stop screw.
7.
Turn the air screw out gradually until the engine
speed drops by 50 rpm.
S. Turn the air screw in to the final opening from the
position obtain in step 7.
FINAL OPENING: 1/2 turns in
9. Aeadjust the idle speed with the throttle stop
screw.
•