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#1
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Ferm, I will do just that. Thanks a lot.
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1988 Grady White Seafarer Yamaha 250 ox66 on a bracket 
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#2
07-13-2014, 08:36 PM
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Ferm, I swapped out the tack and I;m still only turning 4800 rpm's. I currently have a 15x17 aluminum prop, I'm confused on weather to change the size /pitch and or both. any suggestions ? thanks,
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1988 Grady White Seafarer Yamaha 250 ox66 on a bracket
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#3
07-13-2014, 09:37 PM
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It sounds like you need to drop down to a 15 pitch prop for it. Also it may be worth checking to make sure it has the 2.25:1 lower unit gears. Alot of the V4 large gear cases fail, and get swapped out for V6 gear cases(same size), but the V6 case has 1.86:1 gears and the V4 version of it has 2.25:1 gears. Put the engine in gear, mark the prop and flywheel, and see how many rotations of the flywheel it takes for 1 revolution of the prop.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#4
07-25-2014, 04:22 AM
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I took the boat out again yesterday and had the same old problem, she would run great for the first couple of minutes then start to miss and bog rite down to where I cant get the rpm;s above 2000. Yhen while going along at 2000 rpm,s and the throttle in the wide open position she would just take off like a bat out of hell. It clearly seems like the longer I run it the worse the problem gets. Now it sounds like fuel but I took that tank out and flushed it my self 3x's just to be sure I was eliminating any bad fuel issues. And I took this boat out last week with no issues what so ever !! It ran really well, She has a new fuel pump ( VRO removed), New Timer base new Power packs; Carbs rebuilt, Wires. plugs. Seriously stumped here!!!
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1988 Grady White Seafarer Yamaha 250 ox66 on a bracket
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#6
07-25-2014, 10:50 AM
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I pumped the bulb with no results ,phat
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1988 Grady White Seafarer Yamaha 250 ox66 on a bracket
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#7
07-25-2014, 11:00 AM
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Just because you have a new VRO pump, doesn't mean you have a working VRO pump. I chased this same problem before on an engine with a new pump, ended up being the pump was bad out of the box. Get a fuel pressure gauge on it and see if it is holding pressure when it does it. I know this VRO pump when it messed up would block the fuel flow so I couldn't even get fuel to it by pumping the primer bulb. I had to use a hammer to hit the pump to get it to pop open and allow fuel to flow so I could get back to the ramp.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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