Bought a used 2007 F115 TLR 133 hours from Craigslist and it had issues with it not running correctly, sounded like it was running on 3 cylinders. I took it to a factory authorized service and they checked everything and replaced many parts.
This was on inspection to buy the motor.
They checked compression and did a leak down test, all good. Replaced spark plugs, all fuel filters and cleaned the vst tank, sent the injectors out for cleaning. After that, it still didn't run good so they replaced the wiring harness complete, per Yamaha, that wasn't the problem so they replaced the computer, once again per Yamaha and it got much better, but still not 100%.
They sent me home with the motor and I completed the purchase with the guy, he paid for the repair btw.
I installed the motor on my boat and went for a sea trial and the motor was missing badly at all ranges and got worse. I took it back to them and they checked everything over on the computer and seemed through. They noted it still had an issue so I left it.
They synced the vacuum in the intake, #4 was different so they adjusted that, now running even better, but not 100% I took the boat home and to sea trial. Although much better the motor has a miss or stumbling and it seems to be real noticeable at 2000 to 3000 rpm and then sort of smooths out, but not completely. Then at full throttle its starts missing or stumbling again at 5300 and won’t go over 5600. It doesn't matter if it's in the water or out of the water you can hear it missing or a little poping at 2500 rpm real good. This motor looks very clean and it has been sitting a while prior to these issues. They checked for clean fuel and other things as well.
Does anyone have any ideas.
This was on inspection to buy the motor.
They checked compression and did a leak down test, all good. Replaced spark plugs, all fuel filters and cleaned the vst tank, sent the injectors out for cleaning. After that, it still didn't run good so they replaced the wiring harness complete, per Yamaha, that wasn't the problem so they replaced the computer, once again per Yamaha and it got much better, but still not 100%.
They sent me home with the motor and I completed the purchase with the guy, he paid for the repair btw.
I installed the motor on my boat and went for a sea trial and the motor was missing badly at all ranges and got worse. I took it back to them and they checked everything over on the computer and seemed through. They noted it still had an issue so I left it.
They synced the vacuum in the intake, #4 was different so they adjusted that, now running even better, but not 100% I took the boat home and to sea trial. Although much better the motor has a miss or stumbling and it seems to be real noticeable at 2000 to 3000 rpm and then sort of smooths out, but not completely. Then at full throttle its starts missing or stumbling again at 5300 and won’t go over 5600. It doesn't matter if it's in the water or out of the water you can hear it missing or a little poping at 2500 rpm real good. This motor looks very clean and it has been sitting a while prior to these issues. They checked for clean fuel and other things as well.
Does anyone have any ideas.
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