Description
Dual Carburetor Rebuild Kit for Sea Doo 717 & 720 Engines — SP, SPX, GS, XP, GTS
Restore crisp throttle response and reliable starting to your Sea Doo personal watercraft with this complete dual carburetor rebuild kit. Designed specifically for the Rotax 717 and 720 two-stroke engines found in 1993-1999 Sea Doo models including SP, SPI, SPX, GS, GSI, GTS, HX, and XP. This kit provides everything needed to rebuild both Mikuni BN-38 or BN-40I carburetors.
What's Included (Dual Carb Kit)
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Diaphragm kits (x2) — Mikuni-spec pump and metering diaphragms
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Needle & seat assemblies (x2) — 1.5 or 2.0 with Viton tips
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Base gaskets (x2) — Carb-to-intake manifold gaskets
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Gasket/O-ring sets (x2) — Complete internal gaskets for both Mikuni BN carbs
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Fuel inlet filters (x2) — Replace clogged inlet screens
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Check valve components — Replacement flapper valves and retaining hardware
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Adjustment screw O-rings — Low-speed and high-speed mixture screw seals
Compatible Models
| Model |
Years |
Carb Setup |
| SP / SPI |
1993-1996 |
Single or dual Mikuni BN-38 |
| SPX |
1993-1999 |
Dual Mikuni BN-40I |
| XP |
1993-1996 |
Dual Mikuni BN-38/40I |
| GS / GSI / GTS |
1997-1999 |
Dual Mikuni BN-40I |
| HX |
1995-1997 |
Single Mikuni BN-38 |
Important: Two-stroke engines rely on proper fuel metering for both power AND lubrication. A lean condition from a failing carb diaphragm can cause catastrophic piston seizure. Rebuild carbs before riding if the watercraft has sat for more than 6 months.
Frequently Asked Questions
Q: Does this kit fit my 1996 Sea Doo SPX?
A: Yes. The 1996 SPX uses dual Mikuni BN-40I carburetors on the Rotax 717 engine.
Q: Will this work on a single-carb HX?
A: Yes. The HX uses one Mikuni BN-38, and this dual kit provides parts for two carbs. You'll have spares for a future rebuild.
Q: Do I need to replace the needle and seat?
A: Yes, and this kit includes them. Worn needle/seat assemblies are a leading cause of hard starting and fuel leaks in Mikuni BN carbs. The Viton-tipped needles provide a superior seal.
Q: What's the most common mistake when rebuilding Sea Doo carbs?
A: Incorrect pop-off pressure. After rebuilding, test pop-off pressure with a pump and gauge. Mikuni BN-38/40I carbs typically require 23-32 PSI pop-off. Incorrect pop-off causes rich or lean conditions that can damage the engine.
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