That's a classic high-altitude issue. The engine's fuel mixture is too rich because the air is thinner, which can cause it to run poorly, stall, or lose power.
For operation above 3000 feet, you need a high-altitude kit installed on the carburetor. This kit adjusts the fuel flow to match the lower oxygen levels. Operating without it increases emissions and reduces both fuel economy and performance.
Even with the proper kit, you may experience a performance drop above 8000 feet. This is normal for small engines.
- Contact WEN customer service at 800-232-1195 to order the correct high-altitude kit for your 56203i model.
- Once installed, use fresh, high-octane fuel (89 or higher) for best results.
- Expect a slight reduction in maximum power output at altitude.
If problems persist after the kit: Check the basics. Ensure you're using fresh gasoline (within 30 days) and that the air filter is clean. A dirty filter exacerbates airflow problems at altitude.