HPI Racing Nitro MT2 18SS 12003 Instruction Manual
![HPI Racing Nitro MT2 18SS 12003 Race Kit manual cover](/images/iponuWFCRtqMXunTmNxQnqGu/thumbs/thumb175x175.webp)
To break in the engine, start by running the vehicle at a rich fuel setting for the first few tanks. Avoid high speeds and allow the engine to cool between runs. Gradually lean out the fuel mixture over subsequent tanks as the engine gains compression.
Use a high-quality nitro fuel with a 20-25% nitromethane content and a 12-16% oil content for optimal performance and engine longevity.
Check the glow plug for wear, ensure fresh fuel is used, and verify that the fuel lines are clear. Also, confirm that the carburetor settings are correct and the engine receives sufficient air supply.
Perform post-run maintenance after each use, including cleaning the vehicle, checking for loose screws, and inspecting moving parts. Every 10-15 runs, perform a more thorough inspection, including checking the drivetrain and cleaning the air filter.
Start by setting the high-speed needle to the factory default, then adjust the low-speed needle for a stable idle. Fine-tune the high-speed needle for peak performance, ensuring a slight trail of smoke at full throttle to prevent overheating.
Overheating can be caused by a lean fuel mixture, clogged air filter, insufficient cooling airflow, or a damaged cooling head. Ensure proper tuning and maintenance to prevent these issues.
Use a glow plug wrench to remove the old glow plug from the engine head. Install a new plug by hand-tightening it, then secure it with the wrench without over-tightening.
Check the drivetrain for debris or damage. Ensure the clutch bell and spur gear are properly meshed. Inspect the differential for wear or leakage and replace any worn parts.
Adjust the suspension settings according to track conditions, use appropriate tires for the surface, and ensure the vehicle's weight distribution is balanced. Consider upgrading to higher-quality shock absorbers for better performance.
Signs include difficulty starting, loss of compression, excessive smoke, unusual noises, and a noticeable drop in performance. If these occur, consider rebuilding the engine by replacing worn parts such as the piston and sleeve.