Carburetor Adjustment; Idle Speed Adjustment - Yamaha DT501988 Owner's Manual

U-326
w;wwm"'
' " W•.·.44.' ' l l··. '"':'\.tk''
fit \
~Wtti
' ' n1£t
-f%>,·-"'.:,_,.i:0:-'S:~->~··0>'"?•.:«.':-,,;-&-~~-"''-----------
The engine should never be run without
the air cleaner element; excessive pis-
ton and/or cylinder wear may result.
H-900
Carburetor adjustment
The carburetor is a vital part of the engine
and requires very sophisticated adjustment.
Most adjustments should be left to a Yamaha
dealer who has the professional knowledge
and experience to do so. However, the fol-
lowing point may be serviced by the owner
as part of this routine maintenance.
U-330
f;1~'ii'.~7i(il!ll'ifj\J;J{1
t-i~l§ftf:l?%.Y:i(}(,;;.~±:'_f-.}·i-----------
The carburetor was set at the Yamaha
factory after many tests. If the settings
are disturbed, poor engine perform-
ance and damage may result.
7-13
H-901
Idle speed adjustment
1. Start the engine and warm it up for a few
minutes (normally, 1 or 2 minutes) at
approximately 1,000 to 2,000 r/min.
Occasionally rev the engine to 4,000 to
5,000 r/min. The engine is warm when
it quickly responds to the throttle.
2. Set the idle to the specified engine speed
by adjusting the throttle stop screw; turn
the screw in to increase engine speed,
turn tfle screw out to decrease engine
speed.
1. Throttle stop screw