This is a common failure point blamed on the IAC but the root problem isn't the IACs, it's the fact that Mercury is exceeding the duty cycle on many of the engines that causes them to overheat and short out. The harness contains a replaceable fuse that will blow and prevent the shorted IAC from damaging the PCM (ECU-Computer). The advantage of the harness is to prevent a failed IAC from damaging the PCM, which is $2,000+ to replace. With a simple reprogramming of the ECU, you can. Replacement IACs and fuses are also available. Hydro Tec has the ability to boost the performance and fuel economy of your Yamaha SHO. We offer Flashes starting with the VF115 SHO, all the way up to the VF250 SHO. High Performance Upgrade for Yamaha VF250 SHO. With a simple reprogramming of the ECU, you can add as much as 100 hp on some models. Also included are two USA made IAC units with gaskets, hardware, (just in case you drop one in the bilge) spare fuses and a canvas storage pouch. NIZPRO ECU Reflashing will refine your Yamaha VF250 SHO for higher hp, more torque, lower cruising rpm and improved fuel economy. Alttune tune Cars, 4WDs, Tractors, Trucks, Marine Engines and Motorbikes. The kit was developed for twin engine applications and includes two plug-and-play IAC harnesses that are fused to prevent a direct short to the PCM. The first of its kind in the world, the Nizpro 450s Supercharger Kit will turn your Yamaha 4.2 V6 250 SHO into a 450hp Beast Get maximum power with minimal weight gain. Specialists and suppliers of high quality ECU tuning software and hardware. Our kit eliminates costly PCM damage that can occur when an IAC fails, which can be a common occurance. The Marine Design Corporation IAC Survival Kit is designed specifically for Mercury Racing 600SCi, 662SCi and 700SCi engines. NIZPRO ECU Reflashing will refine your Yamaha VF250 SHO for higher hp, more torque, lower cruising rpm and improved fuel economy.
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