3
（
1
）、风门，冷启动时使用
(Choke Lever)
（
2
）、油门
(Throttle Lever)
（
3
）、怠速调节螺丝
(Idle Speed Adjustment Screw)
（
4
）、低速油针
(Low Speed Mixture Adjustment Screw)
（
5
）、高速油针
(High Speed Mixture Adjustment Screw)
调整：顺时针转动怠速螺丝
3
将增大怠速转速，同时要配合低速油针
4
一起调整，顺时针转动低
速油针减少油量（一般是把油针拧到底再退回
1
圈）；高速油针
5(
退回
1
圈
)
最好使用转速表来调整，使
发动机达到最高转速，加减速顺畅为最佳。
ADJUSTMENT:
A general starting point is 1 turns out for the low speed needle (See No. 4), and 1
turns out for the high speed needle (See No. 5).
Adjust the High needle to peak rpm. If ever the engine slows or dies while at full throttle, the high
speed mixture is likely too lean.
Adjust the Low needle until you achieve a smooth idle and a reliable transition to high throttle. If the
engine dies when the throttle is advanced, the mixture is likely too lean. If the engine stumbles
when the throttle is advanced, the mixture is likely too rich.
调整化油器高速油针时请注意：混合气调整过稀将导致发动机严重过热和火花塞烧毁。大油门
燃烧后火花塞的颜色应该是黄色
,
说明混合气浓度比较合适
.
混合气调整过浓时，特别是高速油
针的调整，发动机快速收油门容易熄火。低速油针开得过小，将会引起发动机加速困难甚至熄
火，开得过大将会引起发动机低速不稳、加速缓慢或收油门时熄火。
Caution: Don't be tempted to run an overly rich mixture. A too rich mixture will only result in
poor engine performance (engine is easily off in a quick accelerating and decelerating
process), pre-mature carbon buildup, a fouled plug and excessive exhaust residue.
However, a lean mixture will also damage the cylinder and piston badly. After few times full
throttle tests and check the spark plug, it appears to be yellow if mixture had been set
properly. A lean set up on Low speed needle results engine difficult to accelerating, a ean
set up also results engines unstable and off while deceleration.
3
、发动机的启动
(Start-up the engine)
（
1
）关闭风门，加大油门
,
打开点火电源
.
Step 1: Close the Choke and turn on the ignition, advance throttle to full position.
（
2
）用力转动螺旋桨，（最好用启动棒）直到发动机发出爆炸声
.
发动机会运转
1-2
秒而自动熄火
.
（首次启动或长时间不用可能需要转动多次螺旋桨）。
Step 2:, briskly flip the prop through compression until the engine fires and then dies. It may take a
few more flips if this is first time to start the engine after being stored for a long period.
（
3
）打开风门，油门开至怠速或比怠速稍大一点
,
启动发动机，进入正常工作状态。
Step 3: Open the choke and briskly flip the prop through compression, advance the throttle to very
slightly above the idle position, the engine should start in just a few flips.
（
4
）热车启动：打开风门，油门开至怠速或比怠速稍大一点，直接启动发动机。
Step 4: pen the choke, advance the throttle to very slightly above the idle position, turn on the
ignition and briskly flip the prop through compression.
四、发动机的保养
(MAINTENANCE OF THE ENGINE)
1
、请使用清洁的
93
＃汽油，和机油的比例为
30
：
1
；禁止不同厂家、牌号的润滑油混合使用，
否则将会引起化油器严重阻塞。
Please use the petrol 93
＃
. The ratio of petrol and engine oil is 30:1
；
Do not mixed up different
