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My 02 25 hp 4 stroke starts and idles great, when give it gas

Customer Question
it bogs down bad, doesn't...
My 02 25 hp 4 stroke starts and idles great, when give it gas it bogs down bad, doesn't die just no power and runs rough, return to idle runs smooth, what could be causing this power lose? Have cleaned carbs twice after finding bad gas, and has new plugs
Submitted: 1 year ago.Category: Boat
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Answered in 1 minute by:
5/12/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,289
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hell my name is ***** ***** am I speaking with? Who makes this engine, do you have a make, serial number if mercury, model number if any other brand? Who cleaned the carbs, yourself or a shop? Were they cleaned ultrasonically?
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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Are you still with me?
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Customer reply replied 1 year ago
Not ultrasonic, did myself, first tone cleaning a carb
It's a Yamaha
Model F25ELHB
Customer reply replied 1 year ago
I'm Brian
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Hi Brian, Does it bog as soon as you start accelerating, or does the engine start to build power initially before bogging down?Has compression and spark output been checked yet?
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Customer reply replied 1 year ago
It builds to a pretty high idle just fine then hits a certain rpm it seems and drops out, spark and compression seemed fine when tested. Made us think ignition timing but this appears to control that by the control board.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Timing isn't something that changes on it's own. Have you tried running it on a different tank to rule out a tank issue, or pump the primer bulb over and over as fast as you can while a helper drives the boat?
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Customer reply replied 1 year ago
Drained, cleaned and dried tank, got new fuel line and filter, ball stays primed and has no change if pumped while going, fuel pump shot fuel bout 4-5 feet so appears to being pumping strong, more sounds rich when bogs down
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Got it. You havent' asked anything yet. So my next question is did you have any specific questions for me, or did you want me to explain how we troubleshoot these in the shop, covering all bases?
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Customer reply replied 1 year ago
My question is why is it falling flat above a high idle?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
There isn't an answer to that question other than saying the engine has a problem that needs to be found with troubleshooting. And there are a lot of steps that need to be done in order to figure out where the problem is. Would you like me to give you a call?
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Customer reply replied 1 year ago
Naw I'm good, looking for Internet help. If I knew the solution myself I wouldn't of asked, so the answer is u can't help me.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
My answer is I can explain how the engine gets troubleshot in the shop, and how to find the problem. Troubleshooting does take tools and abilities, and there are several steps to the process. But I have no idea what is wrong with your engine unless the troubleshooting gets done and I know the results.
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Customer reply replied 1 year ago
I ain't paying $21 for that answer, I'm not satasfied, so u can keep ur $5 deposit but u can call ur office and tell them to refund my card asap
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Dominick
Dominick
Dominick, Marine Mechanic
Category: Boat
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