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  1. Z

    O2 sensor or not ?

    I have a 1999 Yamaha 200 (3.1) fuel injected. When I leave the boat ramp and have run approximatley 1 mile reaching 5800 rpm, the motor will feel like it is missing and loose 100 rpms for 2-3 seconds and then go back to 5800. It only does this once, after that it runs great the rest of the...
  2. Z

    Loosing lower unit oil

    I have a strange problem with my 1999 200 (3.1) Yamaha lower unit. The oil is disappearing. It is not leaking out on the ground and there is no water getting in. I have changed all seals, o-rings, prop shaft and prop shaft housing needle bearing. I am loosing approximatley 8-10 oz. in 20 hrs. of...
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