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I have a tohatsu 20hp motor. manual start.2012 model. It has about 20 hours on the motor. For the last 3 times I've used it bogs down when I give it the gas. It runs fine when going slow.

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Could be a dirty carburetor. I found if a gas oil mixture is used sometimes it has a tendency to gum up.

Posted on May 17, 2017


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Posted on Jan 02, 2017


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I have 20hp mercury in neutral can rev high but when in gear full throttle it's like trolling speed

Take the cover off and check that the throttle linkages are all secured to the clips. May also be bad fuel, or moisture in the fuel. I use stabiliser over the winter. With a motor stored that long, it would be prudent to get it professionally serviced.

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Need free repair manual

You need to give symptoms. For example, "I turn the starter motor, engine turns, but it won't start, and I smell gasoline odor." Diagnosis, you're giving too much throttle, the spark plugs become wet & saturated, so it won't start until the spark plugs are dry.
So do you mean it was running, and suddenly stopped in traffic, it was parked overnight and starter motor refuses to turn, or starter motor turns, but refuses to start ?? We need SPECIFIC symptoms if you want diagnostic feedback from this website.
You said "cars" in plural, so two or more cars all broke down at the same time? Maybe you have enemies or someone who wants retribution payback for an argument in recent past, so he sabotaged all your cars? Like in the last 3 or 4 days, or last night? When people are fuming, they exact retribution shortly. The more time goes by, they cool down and decide not to take revenge.

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Has the car had a scan tool hooked up and checked for fault codes, do that.

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Bogs down on acceleration

buy 2 fuel filters. buy can of SEAFOAM at parts store. use 1 f filter to replace old one(you'll probably see old looking gas, with an odor).Pour SEAFOAM into tank. fill up with PREMIUM gas. after about 100 miles change out fuel filter 1 last time..add SEAFOAM every 3-5000 miles and you should be fine. the ethanol in the gas turns to goop and adds water to your fuel, and puts carbon on your valves and through out your emission and fuel system. The ethanol will be alright as long as you follow these instructions. and the SEAFOAM will keep you from having line freeze up in the cold months ahead, and will give you better gas mileage. good luck.

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