LRP Z.18S Pro Pullstart, Инструкция по эксплуатации, Страница: 2 / 4

CARBURETOR:
The factory settings of the engine are as following and are a good starting point for you. Turn in the needles completely
(Caution: do not overtighten them!) and loosen them the required number of turns again:
?? Mid range: 3,5 turns
??
Main: 4 turns
Idle screw (No.1): Adjusts the air flow when
carburetor is fully closed. Turn CW for higher idle-
speed and CCW for lower idle-speed. Should be
open 0.5-1.0mm.
Mid range needle (No.2): Adjusts the mid/low-
speed flow rate of the fuel. Turn CW for leaner
and CCW for richer setting.
Main speed needle (No.3): Adjusts the main
flow rate of the fuel (when the throttle is opened
signif cantly). Turn CW for leaner and CCW for
richer setting.
RUN-IN:
This is a very important step in ensuring that you get the highest performance and lifetime of your engine, take your
time for proper run-in. We do not recommend using run-in benches, use your car for run-in and use the same fuel as
you will be using for the life of the engine. If your engine doesn’t start easily you may try loosen the glow-plug by ½-
turn to decompress the engine and try again, don’t forget to tighten the glow-plug again once it started!
Procedure:
?? Start the engine and set the main-needle very rich, i.e. excessive smoke coming from the muffler.
?? Let the engine idle for 2mins first to warm it up.
?? Now start driving your car, t will be slow and sluggish, but this is an important step.
?? Do not allow the engine to rev-up too high, run the engine at half speed on the straightaway.
?? The engine should not be too cold and not too hot during run-in, 70-90°C (160-195°F) is perfect.
?? Let the engine cool down for 15mins after each tank during the run-in per od.
?? We recommend doing so for 4 tanks of fuel before you start tuning your engine.
TUNING:
It never hurts to have the mixture too r ch, but NEVER let the mixture get too lean. Always tune from rich to lean. If in
doubt, r chen it up first! Never try to tune a cold engine, run 5 full laps to get the engine up to running temperature
before doing any adjustments!
Basic tuning procedure is as follows:
1. Set the engine’s idle speed up slightly higher than normal.
2. Start tuning your engine with the settings too rich.
3. Always tune main-speed needle (top-end) first.
4. Tune m d-range needle next.
5. Reset dle speed screw.
Procedure:
1. Set the dle speed so your engine doesn’t stall (slightly higher then normal).
2. Go to the track w th the main-needle set too rich, there should be heavy smoke coming from the muffler now.
3. Tune the engine by leaning the main-needle 1/8 turn at a time.
?
Your goal will be that the engine will just reach maximum RPM on the straightaway.
?
Open the main-needle again by an 1/8 turn when you have reached that point, this should be the perfect
setting for the main-needle (temperature of 95-110°C / 200-230°F).
?
If the main-needle is set too lean, the engine will overheat and will not accelerate smoothly. If this happens,
immediately stop the engine and richen the main-needle (counterclockwise) 1/4 turn before a new attempt.
4. Adjust the mid-range needle now. Run 3 full laps, stop the car near you and let it dle for 5secs. "Push off"...
It should have slightly richened up, but still accelerate qu ckly. If it died before the 5secs, check the following:
?
If t seemed to load up and slowly stop, the mid-range needle is too rich.
?
If the dle-speed increased before t stopped, the mid-range needle is too lean.
5. You may have to re-adjust the idle-speed now. If it idles too high, the clutch may not release completely and you
will lose "snap" off the corners. If it idles too low, t may stall at the start, or at the end of the straightaway when
you release the throttle.
Ways to measure the engines temperature:
?? Temperature gauge method (recommended): Pull in qu ckly and immediately take a temperature reading. Place
the gauge directly over the engine pointed at the glow plug.
??
Spit method: Pull in quickly and immediately put some sp t on the engine’s head. The saliva should just slowly
boil off (2-3secs). It should not dance around as if t were on a hot griddle, nor should t lay there and steam.
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