2005 Honda BF 200 both engines Won't revs over 4000 RPM

[Buzzanca]

Both engines won't run over 4000 RPM,the port engines as rough idle but runs good up to 4000 rpm,please help

 

[chawk_man]

Simple things first. I assume no alarms are going off, since you did not mention any, and your green oil light is on while underway.

Since both engines are affected, I am initially assuming that it is a fuel feel problem somewhere before the fuel line splits off to each engine.

Open your fuel tank filler cap while under way. If that fixes the problem, you have a clogged breather tube in your fuel tank. Clean it out with a long piece of monofilament from a string cleaner.

While underway, at the point where power is stalling out, check your pump up bulb. If flat, you have a partially clogged pick up tube in your gas tank. Either remove and clean the pickup, or for a temporary solution, blow air back through the fuel line to clear the clog.

If you have an external fuel-water separator (which you should have), drain or replace it.

If all that checks out and you conclude that each engine is having an independent problem then...

Drain and check both your on-board fuel-water separator and low pressure fuel filter.

Drain each VST. The VST is in place to assure an adequate amount of non-turbulent fuel is available to the high pressure fuel pump. (The fuel in the VST tank is kept under pressure to prevent vaporization, thus preventing the fuel from becoming too lean under variable demand.) On the back starboard side of each motor, you will see a plastic tube looped around a holder. Unhook it, and look down at the base where it connects. Beside the connection is a small set screw. Use a long 10” or longer, flat blade screwdriver to open the set screw - slowly. First, turn on your key switch briefly so that the HP fuel pump charges the system. Then, with the end of the hose extended downward into a clear container that will hold at least a quart of liquid, start opening the set screw. Do not open too far - if it comes out, you will need to remove the lower cowling to retrieve it. Anywhere from two to three pints of gas, and maybe some water and gunk will come out of that tube. Be patient, the last stuff to come out is usually slow, but drain out as much as you can. If there is water, or any gunk, then your fuel-water separator and low pressure fuel filter have failed and need to be replaced. At that point, you should also change out the high pressure filter which sits on top of the fuel pump and is held in place with three 5 mm screws. The 200's and 225's are notorious for clogged/deteriorated HP fuel filters.

Run a clear plastic line from your pump up bulb to your onboard fuel water separator and see if you are getting any air bubbles in it while running.

If you are still having problems, then it may be necessary to remove the VST and clean the screen on the outflow tube and check the internal float valve.