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'97 225 EFI yamaha S225turv surges

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  • '97 225 EFI yamaha S225turv surges

    the motor has been doing this since the guy bought it so we cleaned the O2 senson and it ran great for a couple trips and now back to square one. Yesterday we swapped out the O2 sensor but no change. The motor idles fine its just in the upper RPMS that the motor will surge (not sure of the exact differences in rpms) When fuel is shot into the intake the problem stops. The fuel pressure comeing out of the VST never drops. We are haveing the injecters cleaned now. Has anyone had the same or similar problem or have any ideas?

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    Re: '97 225 EFI yamaha S225turv surges

    have replaced all 3 low pressure fuel pumps and problem is still there

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