The Engine Control Unit (ECU) is essentially your jetski's 'brain' and controls various engine functions, including RPM Limits, Timing, fuel and throttle position.
Are jet skis expensive to repair?
Jet skis are not expensive to maintain if you are performing preventive maintenance regularly. The typical jet ski that is ran in the summer months will cost about $50-100 per year for maintenance if you do it yourself. If you pay a dealer, these costs can be upwards of $300.
How much does it cost to restore a jet ski?
If you already have the engine and are just looking for a complete rebuild kit, you may only need to spend $300-$400. However, if you're looking at rebuilding with individual parts, you may run it up to around $500 or more. Any which way you slice it, rebuilding your PWC engine yourself will save you a ton of money.