Not responsible for errors. All prices subject to change without notice. Printed 06/09 16265 Losi, a Division of Horizon Hobby, Inc.
Introduction Losi/Horizon Support If you have any questions concerning setup or operation of your Speed-NT RC vehicle please call Horizon Customer Support at 1-877-504-0233. Thank you for choosing the Speed-NT. This is a highly developed RC model that features a sophisticated radio system and a nitro fuel powered engine. It does require some mechanical experience and direct adult supervision. This guide contains the basic instructions and drawings needed to operate and maintain your new Speed-NT.
Safety Precautions: Batteries and Charging: The Speed-NT uses rechargeable batteries such as NiMH or LiPo. These batteries all have special requirements to preserve performance and last a long time. Read all instructions and precautions that are provided with the batteries intended to be used in the Speed-NT. • Read all instructions provided by the manufacturer of the batteries. • Responsible adult supervision is necessary while charging batteries.
Supplied and Required Equipment Required Equipment: Supplied tools: You will need the following items to start and run the Speed-NT. 20% Sport Fuel – Preferably Nitrotane 20% Sport (LOSF0020). Fuel Bottle – LOSB5201 or similar. Glow Igniter – Losi aluminum rechargeable unit with charger (LOSB5221) or similar. 7.2V rechargeable battery for the Spin-Start – LOSB9900 or similar Charger for 7.2V battery and receiver pack (optional) LOSB9606 or similar.
The Losi Speed-NT Overview Wheelie Bar Receiver Battery Box Rear Shock Rear Camber Link Rear Suspension Arm Slipper Engine Rear Body Mount Exhaust Header Fuel Line Carburetor Brake Adjuster Pressure Line Air Filter Fuel Filler Throttle Linkage/Adjuster Exhaust Pipe Receiver Cover Front Shock Steering Servo Tie Rod/Steering Link Front Body Mount Front Camber Link Front Suspension Arm 5
The Losi MTX Pro Radio System Overview Antenna Dual Rate Adjustment (ST. D/R) Steering Wheel Steering Trim (ST. Trim) Throttle Trim (TH.
Speed-NT Electronics System Overview About the Radio The Losi DSM radio installed in the Speed-NT is a state of the art system featuring the latest technology that requires no crystals. This system includes all the features you may find useful. Be sure to read through the Radio operation instructions on what and how to use these features. The following is a simple guide to items and functions commonly referred to. 1. 2. 3. 4. 5. 6. 7. Steering Wheel - Controls the trucks direction (left/right).
Binding the Radio System Using the EPA Adjustment The Endpoint Adjustment (EPA) feature of the Losi DSM radio allows you to set the amount the servo travels when you turn the steering wheel or push/pull the throttle. This is especially helpful to prevent the servos from stalling with normal operation. Steering: First set the steering trim so the truck goes straight without touching the steering wheel. Lift the front of the truck off of the ground and turn the steering wheel to the right.
Engine Break-In and Adjustments Engine Tuning The new Losi 3.4 engine in your Speed-NT has been machined to tight tolerances and does not need an extended break-in. It is always a good idea to take it easy for the first few tanks of fuel to let all the gears and moving parts seat into one another. You will notice after the first hour of operation that the engine will pick up power.
About Glow Plugs 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.
Driving the Speed-NT Always follow these precautions when running your Speed-NT The electronics in this model are not waterproof and you must avoid running it in or through standing water, wet grass, mud or snow. Do not run the Speed-NT at dusk or in the dark when visibility is limited. Do not attempt to run this model if it will be out of sight for any amount of time. Do not run this model near a crowd of people. Always check for proper radio function and battery condition before operating.
Changing Gear Ratio Adjusting the Gear Mesh A 22-tooth clutch bell is mounted on the engine of your SpeedNT. If you feel the need for greater speed an optional 23-tooth clutch bell (LOSA9391) can be fitted by following these steps. 1. Remove 4-40 screw attaching the pipe mount to the center brace. (Photo: SNT setting gear mesh 1 2. Remove the throttle link from the carburetor. 3. Remove the four 5-40 screws from the underside of the chassis [that secure the engine]. 4.
2-Speed Adjustment Although pre-set at the factory, the two-speed can be adjusted to shift at the point that suits you best. Under normal circumstances, it should shift well before the engine reaches maximum power. The actual distance traveled will vary with the gear ratio and tune of the engine. Tightening the adjustment screw (turning to the right/clockwise) will make the two-speed shift later. Loosening the adjustment screw (turning to the left/ counterclockwise) will make the two-speed shift later.
Adjusting the Slipper Maintenance In addition to the service needs pointed out in this guide, you should try to maintain your new Speed-NT for proper performance and to prevent wear. If dirt gets in the moving parts it can seriously hinder the performance of the model. Use compressed air, a soft paint brush and/or a toothbrush to remove dirt and dust. Avoid using solvents, if possible, as this can actually wash the dirt into bearings and areas not accessible without disassembly, causing additional wear.
Tuning, Adjusting and Maintaining the Speed-NT Tuning the Front End of the Speed-NT Shock Location: The Speed-NT has two mounting locations on the front shock tower. The position can be easily adjusted by simply moving the top of the shock to another hole. The standard location (outside hole on the tower) works best on most surfaces. Moving the top of the shock inward a hole will slow steering response and make the Speed-NT smoother in bumps.
Inboard Camber Location: The Speed-NT has three different inner locations with vertical adjustment for the front camber tie rod. In general, the lower or further out the inside position is, relative to the outside, the more camber gain (total camber change through the total throw of the suspension) is present. This is an adjustment that is difficult to make a generic statement for as it can have slightly different results on various conditions.
Tuning the Rear End of the Speed-NT Ride Height: This is the height of the chassis in relation to the surface. It is an adjustment that affects the way your SpeedNT jumps, turns and goes through bumps. To check the ride height, drop one end (front or rear) of the Speed-NT from about a 5-6 inch height onto a flat surface. Once the Speed-NT settles into a position, check the height of that end of the Speed-NT in relationship to the surface.
Troubleshooting your Speed-NT Camber Rise Relationship: The Speed-NT setup out of the box comes with less front camber gain than the rear camber gain. The reason for this is that less front camber lets the front end drive flatter and makes the Speed-NT more stable. By having more camber gain in the rear, the Speed-NT has more rear traction, this helps the rear tires accelerate through the bumps and ruts. Many questions are the result of simple user errors or minor adjustments which are easily addressed.
Shock Diagram Engine is hard to turn over: 1. 2. 3. If the engine is hard to turn over make sure the battery in your Spin-Start is fully charged. The engine may be flooded. Remove the glow plug, turn the model upside down over a rag and turn the engine over. Raw fuel should spray out of the glow plug hole. Replace the glow plug making sure you replace the small copper gasket that goes on it. If the engine is still hard to turn over there may be internal damage.
Warranty Information Damage Limits HORIZON SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCT, WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY. Further, in no event shall the liability of Horizon exceed the individual price of the Product on which liability is asserted.
Questions, Assistance, and Repairs Non-Warranty Repairs Your local hobby store and/or place of purchase cannot provide warranty support or repair. Once assembly, setup or use of the Product has been started, you must contact Horizon directly. This will enable Horizon to better answer your questions and service you in the event that you may need any assistance. For questions or assistance, please direct your email to productsupport@horizonhobby.com, or call 877.504.
CE Compliance Information for the European Union Declaration of Conformity (in accordance with ISO/IEC 17050-1) Instructions for Disposal of WEEE by Users in the European Union No. HH20090722 This product must not be disposed of with other waste. Instead, it is the user’s responsibility to dispose of their waste equipment by handing it over to a designated collection point for the recycling of waste electrical and electronic equipment.
Operating and Tuning Notes 23
©2009 Losi, A division of Horizon Hobby, Inc. Not responsible for typographical errors. All pricing subject to change without notice.
