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    fast idle with new fuel pumps

    i just replace all 4 fuel pumps on twin '88 150 yamaha 2 strokes.<br /><br />with the old pumps, both motors idled at 800 rpm, with new pumps, one is a 1000, the other at 900. since nothing else changed, should i assume timing is fine and adjust the idle screws? or should i check timing to be...
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    backfire on carb'd 2 stroke?

    The first two times starting my stbd motor ('88 Yamaha 150) after winter layup, there was a loud 'BANG' backfire. It sounded like it came from the exhaust, not the carb, but hard to tell since I was up at the helm. It was running on muffs, with good water pressure, and after the first start it...
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    no telltale water stream after water pump rebuild

    I just replaced the water pump on the first of my twin '88, 150 hp, 2 stroke Yamahas. After install, I started up the motor on muffs and no tell tale pee stream. I let it run about 30-40 sec then shut it down. Tried again, same result. I checked the pee nozzle for crud and it was clean...
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    water pump replacement '88 150 Yamaha

    I received my parts and will be replacing water pumps and fuel pumps on my twin 150's this weekend. I got some good info on the fuelpumps, fuel lines etc., I'm looking for info on doing the water pumps.<br /><br />I've read through the Clymer and it looks pretty straight forward. Does anyone...
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    Yamaha water pump vs. Aftermarket?

    Anyone have experience with Sierra parts? Many sites including this one provide Sierra for Yamaha water pump kits. I'd prefer to get the OEM, but I can't tell if the Yamaha kit comes with the pump housing (yamaha part 6G5-W0078-A1-00, $43) The parts guy at the yamaha dealer didn't know.<br...
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    spring maint planning for old 150 Yamahas

    there is still 1' of snow on the ground, but i'm getting the itch to take the cover off the boat...<br /><br />I have twin '88 150 carb'd motors and I'm planning this spring's maint and shopping for parts. I've had this boat for 1 yr, it ran beautifully last season and it was professionally...
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    Fuel Management Guage for Yammy?

    Does anyone have any experience installing Yamaha Fuel management guage? It's listed on the Yamaha website as part #6Y5-W0088-64-00 for dual engines. I'd like to use one for my twin '88 carb'd 2 strokes (since they like to burn fuel :) . Looks like the kit includes sending units, harness and...
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    Ideal battery & switch setup for twin outboards?

    I have twin 150 outboards and two batterys on a boat that goes moderately offshore (15-20 miles). Currently, each motor is wired to its own battery, there is no switch. One battery runs just the port engine. The other battery runs the stdb engine as well as the house load (through a cb) and...
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    stainless prop cleanup?

    I have twin outboards with stainless props. I've pulled them for the winter and plan to clean them up before spring. They are a little rusty, have a few gouges on the edges, overall pretty dull and dirty looking.<br />(dumb) question: Can I clean them up with some oil and progressively finer...
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    Yamaha oil injection problem

    I have a question with oil injection on my twin 1988 2 stroke 150's. Underway, I got the port engine red alarm light and buzzer indicating that oil level in the main (engine mounted) tank reached the lower level.<br />I shut down immediately, checked the level in the remote (boat) oil tank, saw...
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    rusted tiller arms on '88 Yamaha 150's

    Wrapping up my first season in my 'new-to-me' boat and have GREATLY benefited from the info provided on this board. I have twin '88 carb'd Yammy 150's and they've run perfectly all season.<br />My question is around the tiller arms of both motors: They are VERY rusted and appear to be VERY...
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    tilt/trim leaking? bad actuator?

    First - Thanks for all the great info on this board, it's an incredible asset.<br /><br />Twin '88 150 Yamaha 2-stroke's. I left both motors in the full up position at the dock, did not engage the trailer lock. A few days later, returned to find the stbd motor approx 1/2 down. Was able to...
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    88 Yamaha multi function guage 'clicking sounds'

    This might be a dumb question: I just took delivery of an 23' 88 Grady White with twin 150 Yamaha 2 strokes. With the ignition turned on, with or without engines running, there is a clicking sound every 5 sec or so coming from the engine instruments. It almost sounds like some type of small...
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    need advise on twin '88 Yamaha 150 carb'd

    I bought a boat with these motors on it and I need to get it home. The boat is on Nantucket, so I need to run it about 40 miles to its new home in Buzzards Bay. I'm a bit nervous about it because it's a new boat to me, with older engines and Nantucket is about 30 miles offshore.<br />I had the...
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    twin '88 150 ETXG issues to look for?

    new to this board, very impressed with the quality and quantity of info and advice.<br />just purchased an '88 GW with twin yamaha 150's. paid only about $1K more than what the hull is worth. Ran the engines in a barrel - started fine, idled smoothly, revved smoothly. Compression on all 12...
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    twin '88 150 ETXG issues to look for?

    new to this board, very impressed with the quality and quantity of info and advice.<br />just purchased an '88 GW with twin yamaha 150's. paid only about $1K more than what the hull is worth. Ran the engines in a barrel - started fine, idled smoothly, revved smoothly. Compression on all 12...
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    issues with older Yamahas??

    i'm looking at buying a boat with '88 Yamaha 150's counter rotating. What are the most common problems with these? I know they're not new, but I'm hoping to get a few years out of them. The shift rods and fuel pumps have been replaced in both. What are the other big items to go? Other than...
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