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Yamaha waverunner 1200RECENtly purchased wave runner took out for 4 mile trip ran great took in for evening done inspection and realized it didnt have oil pump only a plate were it should be. so i put some oil in the carb and a little on the pistons and added a rich fuel mixture took ski out next day and idled around for about 30 min. after smoking real good it cleared up so i tried to throttle up and it tried to throttle up but was very boggy. would run upto 37mph if i pumped throttle, i decided to idle some more so idled around another 30 min n decided to throttle up again and it was a little boggy at first then took off like bat out of hell like normal and done perfect for about 5 min then same started bogging and i had to pump throttle to keep from bogging completly down to nothing. Have I ruined this engine not having the oil pump. or can i change plugs n possible rebuild carbs...

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  • 194 Answers

The first thing to check would be the compression. As long as both cylinders are with in 10 psi of each other you should be okay. Both cylinders need to be at least 100 psi. That would be the minimum for a motor to start and run. It should read aprox- 150 -- 165 psi. Also i would check for a possible exhaust leak, that would cause the motor to bog down because the carb is breathing in the exhaust fumes. Try running the motor with the hood up to see if you have a leak.

Posted on Apr 25, 2017

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Posted on Jan 02, 2017

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protek480
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SOURCE: 95 yamaha wave runner starts

Have you changed the 'fuel filter'. That's where you start.

Posted on Aug 29, 2009

  • 1 Answer

SOURCE: 1994 Yamaha Waverunner 3 will idle but wont take throttle

Switch to reserve tanke to check to see if there is a clog at the fuel pickup in the tank.
My friend had the same issue with his waverunner 3.

Posted on Aug 31, 2009

PWCYoda
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SOURCE: Yamaha 1200 year 2004 triple carb. D plate

Is your accelerator pump working?

Posted on Aug 23, 2010

heimlich
  • 1978 Answers

SOURCE: 1998 yamaha waverunner xl760;just purchased it

Take the carburetors apart and clean them. There is probably water caused white corrosion in the fuel needle assemblies. Once the needles are cleaned the fuel should pump and flow through the carburetors again.

Posted on Sep 27, 2011

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