Re: 2003 Yamaha 200 Saltwater Series OX66
This motor is a work horse but is susceptible to minor problems.The low pressure fuel pumps as well as the o2 sensor are the common items that present trouble to this motor.I had a surging problem with mine and it turned out to be the high pressure fuel pump filter and the vst filter that were caked with debris. Again all maintenance items that should of be checked out.Have a compression test done on it and fuel pressure test ,should be around 35psi .Use Yamalube oil and its your call whether to use ring free to mix with gas.On my boat, the previous owner did not use it and when I started using it, is when my problems started.Other than that I cant complain starts right up and runs great.