Make sure the shift linkage is adjusted correctly. Not sure on the yamaha, but on OMC's you have to set the shift shaft height. If you don't get it correct, it will jump out of gear like you describe, and it trashes the clutch dog when it does it. Also on that vintage yamaha, make sure the shift shaft isn't rusted out to nothing. They can rust to the point tbey twist, and not hold it in gear.
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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.
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Last edited by THEFERMANATOR; 05-12-2019 at 08:55 PM.
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