I'm not really up on the 4 strokes, but they say over propping a 4 stroke causes this. You lug the engine, carbon builds up, and then the rings start leaking down and you make oil. I would reccomend doing a heavy dose of ring free and making sure you're propped so that at wide open you reach the upper spectrum of the reccomended max rpm's, or even a little over.
__________________
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
|