HONDA CRF300L High Flow Airbox Velocity Stack Installation Guide

HONDA CRF300L High Flow Airbox Velocity Stack

High Flow Airbox Tube Installation

The goal of this guide is to install the high flow velocity tube into the CRF 300L Airbox. This part replaces part number 6 in the diagram above. To accomplish this, please follow the below process:

1. Remove the two seat bolts (“F-28” in the diagram above – M6 Allen Key)

2. Remove the seat assembly

3. Remove the push pins (number 3 in the diagram above)

4. Remove the fasteners (number 4 in the diagram above – M5 Allen Key)

5. Remove the side covers.

6. Remove push pins (number 28 in the diagram above)

7. Remove fastener (number 30 in the diagram above – M5 Allen Key)

8. Remove the shroud fairing (number 22 in the diagram above)

9. Remove shroud fasteners (number 6 in the diagram above – M5 Allen Key)

10. Remove the shrouds

11. Remove mudflap fasteners (number 11 in diagram above – JIS Phillips Screwdriver)

12. Remove mudflap (number 1 in the diagram above)

13. Remove the rear fender fasteners (numbers 8 and 10 in the diagram above – M6 and M5 Allen Keys

14. Remove the rear fender push pins (number 9 in the diagram above)

15. Remove the rear fender (number 6 and 5 in the diagram above)

16. Remove the fuel tank fasteners (number 20 and 21 in the diagram above)

17. Disconnect the fuel pump connector (connected to number 1 in the diagram above)

18. Remove the two bolts holding the fuel injector in place (not shown but connected to number 11 above – M8 bolt heads)

19. Disconnect the fuel injector connector

20. Remove the fuel tank and fuel injector from the bike. Keep in a clean location.

21. Remove muffler fasteners (numbers 20, 25, 19, and 24 in the diagram above)

22. Remove the heat shield (number 9 in the diagram above)

23. Remove the muffler from the head pipe (number 5 in the diagram above)
    Tip : Rotate the muffler back and forth while pulling the muffler off to make the removal easier

24. Remove battery box fasteners (number 19 and 17 in the diagram above)
    Note : There are three #19 bolts in the diagram above
    Note : The battery box does not need to be removed from the bike

25. Remove airbox fasteners (number 17 and 20 in the diagram above)

26. Remove the airbox lid (number 8 in the diagram above)

27. Remove the air filter (number 2 in the diagram above)

28. Loosen the resonator band clamp (number 7 in the diagram above)

29. Remove the resonator

30. Loosen the throttle body band clamp (number 15 in the diagram above)

31. Remove the crankcase breather hose clamp (number 11 in the diagram above)

32. Disconnect the crankcase breather hose from the airbox (number 9 in the diagram above)

33. Verify all bolts connecting the airbox to the chassis have been removed

34. Remove or move the airbox to a location so the airbox tube is accessible (number 6 in the diagram above)
    Note : The throttle body will need to be disconnected from the tube at this point

35. Remove the airbox tube (number 6 in the diagram above)

36. Open the airbox tube hole to 62mm [2.44”] in diameter
    Tip : a carbide deburring tool works well for this

37. Remove all plastic shavings from the airbox housing

38. Install the new high flow velocity tube into the airbox
    Tip : Soapy water helps with the tube installation
    Tip : Sealing the tube with RTV/Silicone is recommended

39. Part installation is complete, to reassemble, follow steps 34 through 1 in descending order
    Tip : To simplify connecting the velocity stack to the throttle body, follow these steps:

    • Disconnect the throttle body from the cylinder head boot
    • Connect the throttle body to the high flow velocity stack
    • Using the full airbox, velocity stack, and throttle body assembly, leverage it back into the cylinder head boot and fasten

550Performance LLC
2024 Revision 1.3
www.550Performance.com

Documents / Resources

| HONDA CRF300L High Flow Airbox Velocity Stack [pdf] Installation Guide
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References

• 550Performance

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