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I have a 100hp yamaha 4 stroke outboard. It will start and
I have a 100hp yamaha 4 stroke outboard. It will start and idle ok, but will die if I try to rev it up. I have cleaned, adjusted, and synced the carbs. And the fuel pump seems to be pumping fine. what… read more
Jason
Jason
Marine Mechanic
18,630 satisfied customers
In neutral boat runs fine I can increase rpms all the way up
in neutral boat runs fine I can increase rpms all the way up idles great all new fuel and filters put boat I gear fine at 15 hundred rpms bogs when trying to increase rpms would start to decrease agai… read more
Jason
Jason
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1989 Yamaha 40 hps, 2 stroke, 3 cylinder motor. How do you
1989 Yamaha 40 hps, 2 stroke, 3 cylinder motor. How do you adjust the motor so it will idle at a low speed. It run well when it is in high speeds. If you would like to call me to talk, you can call me… read more
Tan
Tan
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My 2001 yamaha 115 2 stroke was running great at the end of
my 2001 yamaha 115 2 stroke was running great at the end of last season, started up this spring ang ran great at idle. started out onto lake and upon giving gas rpm's increased and then motor started … read more
Jason
Jason
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i have a yamaha 115 hp outboard used in the ocean. it is used
i have a yamaha 115 hp outboard used in the ocean. it is used for pulling paragliders off the beach with a winch. the starts are full throttle. was wondering what to do to protect the motor from this … read more
Charles
Charles
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5,068 satisfied customers
I currently run 11 200 HP VRO Evinrudes 1989 in a muddy Yukon
I currently run 11 200 HP VRO Evinrudes 1989 in a muddy Yukon River in Northern Alaska. They operate only 14 days a year and fuel burn is not a concern. I need to repower and my concerns are: durabili… read more
Noel Schembri
Noel Schembri
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I have a 75hp 2007 Yamaha four stroke outboard. I have changed
I have a 75hp 2007 Yamaha four stroke outboard. I have changed the plugs, the gas/water separator filter, the VST filter and added fuel addative. It will start and run at higher rpmsin netural, but sh… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
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i can get my 15 hp merc 2 stroke started but it wont idle.
i can get my 15 hp merc 2 stroke started but it wont idle. and when it does idle,as soon as i try to give it gas it stalls out. fresh fuel and spark plugs. now what… read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
I have Yamaha 200 HP (2004, 2-stroke, SX200C) with about 385
I have Yamaha 200 HP (2004, 2-stroke, SX200C) with about 385 hours on it. It's maintained and I use Yamaha Ring Free additive and Stabilz fuel stabilizers; fuels filters are changed out annually. Runs… read more
orcamarine
orcamarine
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I am in the process of repowering my 1989 Mako 231 with a 4
I am in the process of repowering my 1989 Mako 231 with a 4 stroke outboard. This boat presently has the original Yamaha V6 200 HP motor. I have seen a lot of newer boats (sea Hunt etc) with comparabl… read more
Jason
Jason
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I have a Yamaha 2002 200 hp 2 stroke,it acts as if it were
I have a Yamaha 2002 200 hp 2 stroke,it acts as if it were starving for fuel above 4000rpms,it doesnt die it stalls,the pump bulb is soft,it has been replaced as has the fuel filter and plugs.… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I have a 2008 yamaha two stroke 50 HP. First time leaving the
I have a 2008 yamaha two stroke 50 HP. First time leaving the ramp, the boat runs great with a minor engine cut out @ 2000 rpm. After shutting down the engine, then trying to throttle up again, the en… read more
orcamarine
orcamarine
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Vocational, Technical or Trade Scho
7 satisfied customers
I have a 2004 Yamaha 90 2-stroke. Runs great... but doesnt
I have a 2004 Yamaha 90 2-stroke. Runs great... but doesn't idle perfectly - coughs and stalls... seems to idle at a very low RPM.... also a touch slow to start the engine (don't know if that's relate… read more
Jason Forsberg
Jason Forsberg
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Vocational, Technical or Trade Scho
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1992 Yamaha 130 HP two stroke. Rough idle. Took off upper
1992 Yamaha 130 HP two stroke. Rough idle. Took off upper and lower carbs, spray cleaned with aerosol carb cleaner all visible passages, reassembled carbs to engine. Drained out all old gas except for… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I Have A 200 hp Yamaha Outboard 2 stroke. Last week it started
I Have A 200 hp Yamaha Outboard 2 stroke. Last week it started up fine, and ran fine at full throttle, at idle it would stall out. This week It still wont idle but has started revving to around 6000 r… read more
Jason Forsberg
Jason Forsberg
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Vocational, Technical or Trade Scho
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I have a Mercury 9.9 HP, two stroke engine, S/N 09A28078. I
I have a Mercury 9.9 HP, two stroke engine, S/N 09A28078. I installed new plugs, gapped at .037in, fresh gas and oil, 50:1 mix. The engine will start on the second pull and will rev up when not in gea… read more
ROCKET
ROCKET
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Vocational, Technical or Trade Scho
426 satisfied customers
05 Merc. 5 hp outboard 2 stroke. carb has been cleaned and
05 Merc. 5 hp outboard 2 stroke. carb has been cleaned and idles perfectly, revs to full rpm in neutral, but not in gear, fwd or rev. fuel filters have been replaced. i can find the idle air mix screw… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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My volvo penta petrol engines are stalling a low speed idle,
My volvo penta petrol engines are stalling a low speed idle, particuarlly a problem when mooring or negotiating locks etc. When running at 1800 - 2000 revs they seem ok or though I have noted on occas… read more
Mechman45
Mechman45
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Tan

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Jeff G.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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