HPI Racing Nitro RS4 3 EVO Plus 115895 Exploded View
![HPI Racing Nitro RS4 3 EVO Plus 115895 Race Kit manual cover](/images/wDlHWKLOrAxbvrhfTuLSASNC/thumbs/thumb175x175.webp)
To break in the engine, start by running the car at a rich fuel mixture at idle speed for about 2-3 tanks. Gradually increase speed while maintaining a rich mixture for the next few tanks. Ensure the engine cools down completely between runs.
Use a high-quality nitro fuel with a 20-25% nitromethane content for optimal performance. Always follow the manufacturer's recommendations.
Check the glow plug to ensure it is functioning properly. Verify that the fuel is reaching the carburetor and inspect the fuel lines for blockages. Ensure the engine is not flooded, and adjust the needle settings if necessary.
After each run, clean the car to remove dirt and debris. Check the air filter and clean or replace it if necessary. Inspect the glow plug, fuel lines, and exhaust system for any signs of wear or damage.
Adjust the high-speed needle for top speed by leaning or richening the mixture. Fine-tune the low-speed needle for smooth acceleration. Always make small adjustments and test the performance after each change.
Common signs include sluggish acceleration, slipping during operation, and unusual noises. Inspect the clutch shoes and springs for wear and replace them if necessary.
Adjust the suspension settings such as the shock oil viscosity, spring tension, and ride height. Consider upgrading to performance tires suitable for the surface you are running on.
Stop the car immediately and let the engine cool down. Check the needle settings as a lean mixture may cause overheating. Ensure the cooling head is unobstructed and the fuel mixture contains enough lubrication.
Replace the air filter regularly, especially if you frequently run in dusty conditions. Clean it after every run and replace it if it shows signs of wear or damage.
Drain the fuel tank and run the engine dry to prevent gum buildup. Remove the batteries and store them separately. Keep the car in a cool, dry place away from direct sunlight.