Specifications

Installation Instructions
Honda GX25/GX35 1-2Hp
Note: Due to changes in O.E.M configurations and application/engine configurations the Intake
adapter or Orifices may need to be slightly altered for best fit and performance.
1. Close gasoline on/off valve if available or empty gas tank of gasoline.
2. Start engine and run until all gasoline is consumed from the carburetor.
3. Disconnect spark plug(s).
4. Remove air filter cover, air filter, and air filter assembly in order to access carburetor.
5. Remove engine cover.
6. Remove carburetor.
7. Remove intake assembly.
8. Replace studs in intake assembly with longer studs supplied with AltFuel stud kit.
9. Reassemble intake assembly.
10. Install carburetor back on studs, making sure throttle cable and gaskets are in place.
11. Make sure that the O-ring is in place on the carburetor flange.
12. Carefully thread provided orifice into the AltFuel Intake Adapter. Thread orifice in until
non-threaded section of orifice touches the surface of Intake Adapter. Do not over tighten.
13. Thread 90 degree fitting into orifice.
14. Apply Teflon tape or pipe sealant to threaded fitting on the end of the AltFuel Fuel Supply Line
and carefully thread into 90 degree fitting on Intake Adapter.
15. Place AltFuel Intake Adapter with Fuel Supply Line attached in front of carburetor with orifice
facing up.
16. Apply black silicone sealant to surface of intake assembly touching the Intake Adapter.
17. Fuel Supply Line should be mounted down and to left.
18. Reinstall air filter assembly, air filter, and air filter cover.
19. Install Regulator System below balancing point on handle, or in desired position.
20. Attach Fuel Supply Line to regulator System.
21. Attach propane source.
22. Start and run. Adjust idle screw in to achieve a higher idle rpm.