See full version: Can; t reach Max RPM
For the tach, my guess is that there is a switch behind the tach which is set to the wrong cylinder configuration. Yours needs to be on 6cyl or the corresponding letter indicator for a 6cyl. Easy to check and change . . . Good luck!! here
Great! Thanks for running the numbers! I'll check the settings on the tach. If the idle RPM is correct, would the top RPM be off? I got the Hp rating from my Seloc manual. It lists 86-87 at 125HP with the 2bbl. The 1985 lists for 175HP with the 2bbl. It also lists all years 85-87 with the 4 BBl at 205 HP. This might not be the same as a factory OMC Cobra manual. Thanks for your help! [links]
Hey Guys I cant achieve max RPMS! At WOT it will only go to 3300 RPMS at 41 MPH GPS. The recomended max rpm is 4200-4600. I'm about 1000 RPM low. Boat starts and runs great! Here are the specs:
Iboats Boat and Motor Info
If the tach is off due to the reason I suspect it will be a percentage off throughout the range. How do you know your idle RPM is reading correctly?
Usually, propeller blades are damaged due to the situation I’ve mentioned at the beginning of this write-up. When you hit a log or sandbar, and you find the boat slow when coming to the plane, then it’s okay to assume the propeller is damaged. more
I have researched a lot about this issue and came up with a few viable solutions that just might work in your situation, or any similar situations for that matter. First, let’s look into the possible reason for lowered rpm.
If you find these issues, replace the broken parts or fix the distance issues of the blades and check if the boat goes over 3000 rpm. here
After you have identified the reason, now it’s time to fix your boat. Most of these solutions are DIY, but if you’re a newbie, it’s better to get it checked by a pro.
Sometimes the propeller may seem fine, but a broken shaft can be harder to spot. A damaged shaft will cause vibrations, and when looked at from the side, there will be a visible bent.
When was the last time you checked your propeller? Propellers need to be cleaned and maintained regularly because they collect debris as they go. [links]
If your carburetor has no technical malfunction, it might need to be thoroughly cleaned. Debris and buildup can easily clog it and limit the air it needs to combust. [links]
A defective carburetor can cause a restricted air intake or blockage that affects the fuel combustion process, as well as cause fuel flooding. here
We hope our guide helps you understand why your boat won’t go over 3000 RPM under load. Once you pinpoint the cause and fix it, you should be cruising with ease in no time!
Check the fuel tubes and fuel injectors for any blockage, and replace any faulty fuel injector tops. You should also examine your fuel pump pressure and vacuum, if you’re used to keeping an eye on their regular numbers, you’ll notice when something is off. here
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