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Yamaha 150 hp 2 stroke 1999 model. new water pump, new
Yamaha 150 hp 2 stroke 1999 model . new water pump, new thermostats installed ran motor in water barrel to test pump lots of water flow and pressure (15lbs) all appears to be fine . Problem is it acts… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
2004 150 hp 62 stroke. alarm goes off.Changed thermostats.
Second opinion] 2004 150 hp 62 stroke. alarm goes off.Changed thermostats. ran at all different rpms for over an hour. no alarm. put back on trailer, hooked up flush hose. Idles while flushing. after … read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
1998 23' Hurricane fun Deck 232, Yamaha Outboard 0x66 Salt
1998 23' Hurricane fun Deck 232, Yamaha Outboard 0x66 Salt Water Series 150 hp, 6 cylinder, fuel injected. Just replaced water pump, Thermostats. The alarm goes off with a steady sound after running a… read more
Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
I have 1999 Yamaha 130 hp saltwater series engine with 570
I have 1999 Yamaha 130 hp saltwater series engine with 570 hrs on it. had cooling ports cleaned 6 months ago and engine ran really well. Today I ran for about 7 miles at 4500 rpm with no problems then… read more
Charles
Charles
Certified Mercury Tech
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I have twin 200 hp saltwater series Yamaha outboards on a
I have twin 200 hp saltwater series Yamaha outboards on a 27' Grady White. The starboard engine is cutting off on high temp alarm. The impeller, t'stat, poppet valve and water pump housing have all be… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
Hows it going. Just picked up a boat w/ older Yamaha 90 2
Hows it going. Just picked up a boat w/ older Yamaha 90 2 stroke giving me an alarm after running on plane for 2-3 minutes. Engine is pee'ing strong and I replaced a bad thermostat, still getting alar… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
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I have a Yamaha F150LB with about 32 hours on it. The engine
I have a Yamaha F150LB with about 32 hours on it. The engine has unexpectedly abruptly and irregularly slowed itself and then stopped. Tech manual tells me that engine will slow itself when overheatin… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
Boat alarm with flashing light on gauge. The engine sounds
Boat alarm with flashing light on gauge. The engine sounds the same. It idles fine, but when you start to speed up, the alarm begins to sound.… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
I have a 2013 Yamaha 150 4 stroke that got some water in the
Jeff I have a 2013 Yamaha 150 4 stroke that got some water in the fuel and the water until alarm came on, i emptied the bad fuel all the way from the inside small fikter to the tank including a new fi… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 2004 Yamaha 150 2 stroke and its running hotter
Hi, I have a 2004 Yamaha 150 2 stroke and its running hotter on one side then the other 156 on the right bank and 125 on the left bank. I replaced the impeller, thermostats, fuel pumps and new plugs. … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I have twin yamaha 250hp 4 strokes engines (2007) I had a
I have twin yamaha 250hp 4 strokes engines (2007) I had a problem with the over heat sensor sounding when in fact the engine was not overheating. I replaced the thermometer sensor, thermostats and ove… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
Have 2006 yamaha 250 4 stroke runs good till 3300 and higher
Have 2006 yamaha 250 4 stroke runs good till 3300 and higher temp gauge climbs up but always back down before alarm twins on 306 Grady changed states and complete pumps fluid level ( oil ) good also h… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a Grady White 240 Offshore with two 2002 FICHT Ram 135
I have a Grady White 240 Offshore with two 2002 FICHT Ram 135 engines. The boat was brought back from Florida a year ago with approximately 100 gallons of 87 octane aboard. The tanks were not treated … read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 satisfied customers
I just bought a 2005 nitro boat with a 2005 Mercury 150 hp
I just bought a 2005 nitro boat with a 2005 Mercury 150 hp xr6. The motor looks brand new, cant be too many hrs on it. Anyway, I put it in the lake yesterday. It started right up but it took a while f… read more
Jason
Jason
Associate Degree
210 satisfied customers
I have a pair of 1996 yamaha saltwater series 150 hp. just
I have a pair of 1996 yamaha saltwater series 150 hp. just has been serviced for the annual.when im traveling around thirty knots the engines run fine however when i open the throttle my starboard eng… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
i am looking at a 2001 grady white marlin. This boat has twin
i am looking at a 2001 grady white marlin. This boat has twin yamaha V250s with about 300 hours. my questions, are these 4 strokes, are they any good compared to the new yamaha 4 strokes, and to chang… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Just bought a 2006 Hurricane,twin 2006 Yamaha 4 stroke 150s.
Just bought a 2006 Hurricane,twin 2006 Yamaha 4 stroke 150's. Had both motors serviced for 200hr maint. overhaul. Both had new water pumps/impellers installed (at least that was what I was charged for… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
i changed my water pump and took boat for a trial run to see
i changed my water pump and took boat for a trial run to see if i fixed the problem, no i didn't. before i changed the pump, the alarm would sound at about 4000rpm, the motor would drop down to about … read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

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John White

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Jason

Jason

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Tan

Tan

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Jeff G.

Jeff G.

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Noel Schembri

Noel Schembri

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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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