Question about Yamaha 12V Air Pump

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I have a 1992 yamaha 115 hp boat motor 2 stroke i took it in and had carbs rebuilt well boat idles good and runs good with a hose hooked to it but when i put it in water it runs bad i cantget over 2800 rpms and it boogs out pretty bad any thought what it could be? maybe bad carb job?

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Did you tune the carburettor to the engine correctly. It there a fuel flow issue ...

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dcramer531
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SOURCE: 1992 115 hp V4 2

The carbs on 2 strokes are always needing a little adjusting, either your plugs are somewhat foulded, carbs gummed up from setting, restriction in fuel delivery, linkage could also be biding slightly. These are the general issues, any more would require a tech to get hands on and test them. But if your savy enough to adjust the carbs, just bump the idle up a tad after you check everything out. I am guessing that this may clear up on its own, but may need a bump.

Posted on Mar 27, 2011

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Not running


I would check all of your fuel delivery system first. Make sure your gas line at the motor end has pressure and that you haven't hooked up the hose in reverse ( it happens). If fuel squirts out when you push in the little ball with a pointy object, you're good. Next, I would check the screen /filter on the fuel pump and maybe clean up the screen with a little carb cleaner. If it was running good last time you used it, the last thing I would mess with is the carb.

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Outboard 115 yamaha misfiring at low revs


Unscrew the 4 idle mixture screws 1/2 turn 1 at the time till sneezing stops...
Clean your carburettors

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1992 115 hp V4 2 stroke had carbs done last year ran great all summer but this spring (as the fish are in the river) it will not Idle. It will run great at high RPM's


The carbs on 2 strokes are always needing a little adjusting, either your plugs are somewhat foulded, carbs gummed up from setting, restriction in fuel delivery, linkage could also be biding slightly. These are the general issues, any more would require a tech to get hands on and test them. But if your savy enough to adjust the carbs, just bump the idle up a tad after you check everything out. I am guessing that this may clear up on its own, but may need a bump.

Mar 27, 2011 | Yamaha 12V Air Pump

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