HP may have been restricted using a smaller carb,different carb jets,different size intakes,etc.Īny setup differences would have to be done manually,as there was nothing electronic or automatic on a carbed motor to regulate fuel/air flow,spark advance etc. When you remove the restrictor the ECM will automatically readjust everything else. On the EFI motors,the restrictors were an easy way to regulate the HP,because the EFI and ECM (Electronic Control Modules ) automatically did the rest,automatically adjusting the fuel/air mixture,for the increased CFM (airflow). The other issue is that it is carbed,not EFI. I believe the 40HP of that generation is already maxed. You can only increase the HP of a motor that is not running already at full output. In the case of your 1999 Merc probably not. But that is a few years away so I would like to get this mod done for a few years until that time comes. If this will work for my motor I can hold off and save up for a 75hp to max out the motor size for my boat and then remove the restrictor plate and get around 90hp out of it. Will this work on a 99 merc 40 hp four stroke that isn't an efi? I was thinking of upgrading my motor but really can't afford it right now.
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