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Page 4

Base Start-up Settings from the Factory

High-Speed Needle—2

3

/

4

 turns out from bottom

Low-Speed Needle—2

1

/

2

 turns out from bottom

Engine Tuning

After the engine is broken in, you can tune it for optimum performance. When 

tuning, it is critical that you be cautious of overheating as severe damage and 

premature wear can occur. You want to make all carburetor adjustments in 

“one hour” increments.

Low-Speed Adjustment

The low speed adjustment affects the idle and slightly-off-idle performance. 

The optimum setting allows the motor to idle for at least 8−10 seconds. The 

model should then accelerate with a slight amount of sluggishness and a 

noticeable amount of smoke. The simplest way to check this is to make sure 

the engine has been warmed up and let the engine idle for 8−10 seconds. If 

the low-speed mixture is so far off that the engine won’t stay running that 

long, turn the idle stop screw clockwise, increasing the idle speed. With 

the engine at idle, pinch and hold the fuel line near the carburetor, cutting 

off the flow of fuel, and listen closely to the engine rpm (speed). If the low-

speed needle is set correctly, the engine speed will increase only slightly and then die. If the engine increases 

several hundred rpm before stopping, the low-speed needle is too rich. Lean the mixture by turning the needle 

clockwise one hour and trying again. If the engine speed does not increase but simply dies, the needle is too 

lean and needs to be richened up by turning the needle counterclockwise one hour before trying again. After 

you have optimized the low-speed setting, the engine will probably be idling faster. You will have to adjust the 

idle stop screw counterclockwise to slow the engine idle speed down. The engine should accelerate at a constant 

pace without hesitating.

Hi-Speed Adjustment

After initial acceleration, the engine should pull at a steady rate while maintaining a two-stroke whine and a 

noticeable trail of smoke. If the engine labors and is sluggish with heavy smoke, the mixture is too rich and needs 

to be leaned by turning the high-speed needle clockwise in one-hour increments until it runs smoothly. If the 

engine isn’t smoking or starts to die after acceleration, it is too lean and you must richen the mixture by turning 

the needle counterclockwise. Don’t be confused by the sound of the engine and the actual performance. A 

leaner mixture will produce an exhaust note with a higher pitch but this does not necessarily mean improved 

performance, as the engine is on the verge of overheating and may incur possible damage. Ideally you want to 

run the engine so that it is on the slightly rich side of optimum. This will give you the best combination of speed 

and engine life. 

CAUTION

: The engine is too lean and overheating if it accelerates rapidly with a high-pitched 

scream then seems to labor, stops smoking, or loses speed. This can be caused by the terrain, atmospheric 

conditions, or drastic altitude changes. To avoid permanent engine damage, 

immediately

 richen the mixture by 

turning the high-speed needle counterclockwise at least “two hours” and be prepared for further adjustments 

before running any more. 

Note

: The normal operating temperature as seen on your radio screen should be in the 

190 to 220° F (88 to 105° C) range.

1 H

our

2 H

our

Carb Adjustments:

Make all carburetor adjustments

in one-hour increments.

Imagine the slot in the needle is

the hour hand on a clock. Adjust

it as though you were moving

the hour hand from one hour to

 the next or previous one.

High-Speed Needle

As you turn this clockwise (leaner),
less fuel enters the engine. 
Turning it counterclockwise 
(richer) allows more fuel to enter 
the engine.

Idle Speed Screw

As you turn this clockwise, it
increases the carburetor opening 
at idle and increases idle speed. 
Turning it counterclockwise 
decreases the opening and idle 
speed.

Low-Speed Needle

As you turn this clockwise (leaner),
less fuel enters the engine. 
Turning it counterclockwise 
(richer) allows more fuel to enter 
the engine.

Richer

Leaner

Idle Speed

Screw

Faster

Slower

High-Speed

Needle

Carb Opening

Leaner

Richer

Low-Speed

Needle

Содержание LST XXL

Страница 1: ...Operations Guide Not responsible for errors All prices subject to change without notice Losi a Division of Horizon Hobby Inc...

Страница 2: ...h a reverse gear Just like a real automobile you must wait for the model to come to a complete stop before shifting between forward and reverse Failure to do so will cause damage to the transmission F...

Страница 3: ...to get a feel for the steering response and handling characteristics of the model 2 You can also break in the engine by placing the model against a wall or fixed object and allowing the engine to idl...

Страница 4: ...e engine labors and is sluggish with heavy smoke the mixture is too rich and needs to be leaned by turning the high speed needle clockwise in one hour increments until it runs smoothly If the engine i...

Страница 5: ...eating and the high speed needle needs to be richened turned counterclockwise at least two hours About the Radio The Spektrum DX3S radio installed in the LST XXL is a professional level system with mo...

Страница 6: ...rature requires that the temperature sensor SPM1450 be installed around the head just above the head bolts as seen in the photo Note The temperature sensor must be removed before removing the head fro...

Страница 7: ...e engine to rev higher Turning them counterclockwise will make it shift earlier and require less engine speed If you should get lost adjusting the two speed start over at the factory setting by lightl...

Страница 8: ...ay from the clutch shoes near the inner race of the bearing Install the bearings into the new clutch bell Before replacing the clutch bell wipe out the inside with motor spray lacquer thinner or a sim...

Страница 9: ...e four 5 64 flat head screws from the ring gear allowing it to be removed Inspect the ring and pinion gears for wear replace if necessary Remove the cross shafts bevel gears and shims for the carrier...

Страница 10: ...ase half 7 Regrease the gears and shafts inspecting each for wear 8 Replace any worn or failed gears 9 Wipe out the inside of the gear case removing any debris old grease and foreign matter 10 Check a...

Страница 11: ...out the old fluid from the shock body before reinstalling the car tridge shaft assembly Pull the shaft out so that the piston is next to the cartridge and reinstall the assembly into the shock body t...

Страница 12: ...Factory Settings Using Nitrotane 20 Sport Fuel Using Nitrotane 20 Sport Fuel x21 2 x23 4 x5 2 7 in 68mm Steering x1 Losi 30wt Shock Oil LOSA5224 High Speed Needle 23 4 turns out Slipper 1 turn out Eng...

Страница 13: ...build Engine overheats High speed fuel mixture is too lean Low speed fuel mixture too lean Spoiled or improper fuel Cooling air is being blocked Excessive load on the engine See Understanding Rich and...

Страница 14: ...Set 2 All 4 99 LOSB3540 F R Diff Outdrive Set All 10 99 LOSB3541 F R Diff Drive Yoke All 5 99 LOSB3547 Center CV Driveshaft Assm Long XXL 16 99 LOSB3601 Brake Disks Steel 2 LST 2 4 99 LOSB3603 Brake C...

Страница 15: ...99 CLUTCH PARTS LOSB3323 Aluminum Clutch Shoe Spring Set LST2 22 99 LOSB3328 Long Wear Aluminum Clutch Shoes 3 LST 2 XXL Aft 24 99 LOSB3340 Clutch Bell Only 2 Seed Threaded LST 2 10 99 LOSB3341 18T 2...

Страница 16: ...28 B3601 B4203 A6248 B3125 B3119 B3127 B3125 B3127 B3119 A6941 B3115 B3117 A6941 A6107 B3136 B3135 B3125 A6107 A6940 B3113 A6356 A6939 A6250 B3128 B3102 B3114 B3116 A6939 A6940 B3103 B4203 B3125 B3124...

Страница 17: ...Page 17 B3547 B3547 B3547 B3547 B3342 Drivetrain Assembly...

Страница 18: ...Page 18 B2278 B2250 B2250 Chassis...

Страница 19: ...Page 19 Chassis...

Страница 20: ...Page 20 B7012 B7407 B2035 B2035 Front Assembly...

Страница 21: ...Page 21 B7012 B7407 B2035 Rear Assembly...

Страница 22: ...LOSR2223 LOSR2223 LOSR2224 LOSR2228 LOSR1042 LOSR1041 LOSR2223 LOSR1043 LOSR2212 LOSR2216 LOSR2211 LOSR2211 LOSR2223 LOSR2225 LOSR2222 LOSR2215 LOSR2228 LOSR2213 LOSR2211 LOSR2210 LOSR2218 LOSR2217 L...

Страница 23: ...damage to the Product or other property This Product is not intended for use by children without direct adult supervision The Product manual contains instructions for safety operation and maintenance...

Страница 24: ...k with any questions or concerns regarding this product or warranty Instructions for Disposal of WEEE by Users in the European Union This product must not be disposed of with other waste Instead it is...

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