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C-Dude

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I bought a 22' cruiser a few months ago. The boat has twin Honda 40's, both circa 2000. The motors have 125 hours on them. The port motor was running rough and stalling at idle and venting fuel through the #3 carb. I brought it to a local mechanic, who charged me $180 and cleaned "gunk" out of the carb where the needle meets the seat. He said that is why it was venting gas. He also said he synchronized both motors.

I got the boat back right before the fourth and was planning on meeting everyone out in PWS and to stay out for several days and put some miles on.

When I got the boat on the water, they both started fine, but now the starboard engine does not register on the Tach at idle and stalls. The port engine warms up at full choke erradically. The port engine will only go up to 3200 rpm at 3/4 throttle, then anymore throttle than that and it runs extremely rough between 3200 and 3800 rpm at max throttle. The starboard engine at max throttle only goes to 4300 rpm.

When I originally brought the boat in to get the 1 carb and the fuel overflow problem fixed, both engines ran great except for the problem I mentioned before. Now, immediately after bringing it in, both engines are screwed up.

I brought the boat back today to the same place, because I don't have anywhere else to turn that can look at it in the next month and summer is slipping by. The place told me that the problems have nothing to do with the work they performed, which isn't possible in my eyes, because they were fine beforehand. They said it was bad gas, but I have new gas filters, Raycor water seperating filters and 2 isolated tanks. I had run on the same gas the week before with no problems.

Does anyone have any insight?
 
Replace the fuel filters on each motor and try running fresh fuel from a portable tank.
Remove the fuel line from each motor and use the prime bulb to pump fuel into a glass container. Let each sample sit and see if you have any gunk or water. Water will seperate after teh sample settles and you can see what you have.
If the samples are fine you may need to adjust your carbs. Invest in a good service manual if you do not already have one. Carbs aren't really that tuff on a boat.
Check the throttle linkage and make sure it is clean and moving freely. Check the chokes, look for loose connections and anything unusual.
The best bet would probably be to seek a qualified (certified) Honda marine mechanic.

I hope this helps and good luck.
 
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