Taking the throttle body and reed valve off, inspecting the reed petals against a light, and reassembling with fresh gaskets.
Guide
Fuel injection removal & installation
Difficulty: IntermediateTime: ~25 minApplies to: Gas boardsLast updated: Sep 2026
Watch the walkthrough
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· JETSURF Service Tutorials #9. Timestamps in the steps below follow the video's on-screen counter (0:14–0:36).
This is the job for inspecting or replacing the reed valve — the one-way flap valve behind the throttle body. Worn reed petals cost power and make the engine hard to start. The check itself takes seconds; the care is in the two gaskets on reassembly.
Tools & supplies
3 mm Allen key
Two new gaskets (engine-to-reed and reed-to-throttle-body)
0:14 — Using a 3 mm Allen key, unscrew the throttle body.
0:14 — Remove the reed valve housing together with the throttle body.
Inspect the reed petals
0:22 — Hold the assembly up to a light source and look through the reed petals. If any light passes through, the petals are not sealing — replace the reed valve.
Installation
0:29 — Fit the first gasket onto the engine, then mount the reed valve.
0:33 — Place the second gasket between the reed valve and the throttle body.
0:36 — Position the throttle body and drive the bolts with Loctite.
Tip: a good reed petal sits dead flat against its seat — no daylight, no curl at the tip. Check both sides of every petal against the light, not just one.
Caution: always use both new gaskets and don't reuse the old ones — an air leak here leans the mixture and can cause engine damage. Loctite every bolt; never run them dry.
Written up by riders from the manufacturer walkthrough above and our own time with these boards — not official JETSURF documentation. Procedures, torque figures and service intervals vary by model and year: check your owner's manual, and if a job is beyond you, book it with a service centre. Work on your board at your own risk.
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