HPI Racing Savage 3.5 12881 Instruction Manual
![HPI Racing Savage 3.5 12881 Race Kit manual cover](/images/PkfOSLoVTkSAQfiTAHSnzZhB/thumbs/thumb175x175.webp)
To break in the engine, start by running the engine at a rich setting with the car's wheels off the ground. Perform several tanks of idling followed by gentle acceleration until the engine reaches normal running temperature. Gradually lean out the fuel mixture over the next few tanks while varying the throttle.
Use high-quality nitro fuel with a 20-25% nitromethane content. Ensure the fuel is fresh and suitable for 2-stroke engines to maintain performance and longevity.
Adjust the high-speed needle to achieve a slightly rich peak RPM, then adjust the low-speed needle for smooth acceleration. Fine-tune the idle needle for stable idling without stalling.
Check the glow plug to ensure it's functioning and replace if necessary. Verify the fuel lines for blockages or leaks, and ensure the carburetor is set to factory settings. Charge or replace the glow igniter and check the pull start mechanism.
Basic maintenance should be carried out after every few runs. This includes cleaning the air filter, checking for loose screws, inspecting the drivetrain, and lubricating moving parts. A thorough inspection and cleaning should be done every 10-15 runs.
Clean the vehicle thoroughly and remove any residual fuel from the tank and engine. Store the car in a cool, dry place. Disconnect the batteries from the receiver and transmitter to prevent leakage or damage.
Remove the engine from the chassis, then detach the clutch bell by removing the securing screw or nut. Slide off the old clutch bell and replace it with a new one, ensuring the bearings are correctly seated. Reattach using the screw or nut and reinstall the engine.
Common signs include sluggish or erratic steering response, abnormal noises, and the inability to hold a position. Check for physical damage and ensure the servo is receiving adequate power.
Adjust the shock oil viscosity and spring tension to suit your driving conditions. Softer oil and springs are better for rough terrains, while stiffer setups work well on smooth surfaces. Regularly check for leaks and replace worn components.
Inspect the slipper clutch for wear and adjust the tension if necessary. Check the gear mesh between the spur gear and clutch bell. Ensure there are no stripped gears or debris causing interference.