CARBURETOR ADJUSTMENT
(continued)
Note –
Adjustments should be done carefully. Warm-up the engine for 3 to 4 minutes
before attempting to make any carburetor adjustments. Be aware that changes in the
barometric pressure, humidity, and ground altitude affect the carburetor and engine
performance.
Step 1
– With the engine off , start by turning the needles all the way in (clockwise) but
do not force them. Check to see that the tension springs are lightly depressed. Then set
the Low and High needles at 1 ½ turns front seat. These are factory settings. This puts
both on the rich side and leaner adjustments can be made as needed. Any other
adjustments should be made to ±⅛ turns in either direction. Too lean an adjustment can
cause improper lubrication and damage the engine.
Step 2
– Adjust the idle adjust screw to stabilize idle rpm at 2000rpm ± 100. If this
setting is too difficult to obtain, turn off the engine and restart before trying again.
Step 3
– Engage full throttle and check acceleration. If the engine fails to accelerate
smoothly or seems to stop, then turn the L-needle ⅛ clockwise . Further adjustments by
⅛ turn can be made but should this fail to correct the problem then another cause for
poor acceleration is suspected (probable). Trouble shoot further or contact your dealer
or a Parajet service representative for assistance.
Step 4
– Adjust the idle adjust screw again to stabilize idle at 2000rpm ± 100. Again
engage full throttle for 5 to 10 seconds and return to idle. Repeat Steps 4 and 5 until idle
is stable
.
Do
not exceed ½ turn clockwise. The L- needle should always be at least 1 full
turn open from seat (CCW).
(
H) Needle rotate 1/8 turn CW or
CCW for top end
power
(L) Needle rotate 1/8 turn CW or
CCW to set first 70% of rev range. If
engine dies when throttle is
opened, turn CCW ¼ turn
High Jet T-Bar
Adjust by hand
Low Jet Screw
Use screw driver to adjust
16
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