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Heff, sorry for the delay in responding. I’ve been stalling trying to figure out a good time to rebuild, but I think I got lucky.

So, the Powertune/Marvel Mystery Oil/SeaFoam helped a little....

Thanks, Don. I appreciate your feedback and will definitely give it one last shot with the power tune.

Like I said, if this does result in a tear down due to a damaged piston, cylinder, etc. I'll...

No, they are not in order. I took the port side first 2,4,6 then starboard 1,3,5. Battery shouldn't be an issue. It's only a few months old and I had it plugged to the onboard charger while testing....

Thanks in advance for taking the time to read and weigh-in.

Serial #: OT834066
2004 Optimax 135 XL SWB
798 hours

I've noticed for almost a year now, that my motor presents a vibration that...

Yes, I disconnected the HP pump when I pinched off the LP line downstream of my gauge. That way the LP pump would be the only pump responsible for pressurizing that gauge. Sure enough, when I turned...

Ipugh,

Thanks for the reply. Yes, my LP pump is external to the VST. The only schrader valves I have are on the port fuel rail. Top is for fuel, side is for air.

We are thinking on the same...

Serial # is OT834066.

As to the fuel/air pressures, I am testing with dual liquid gauges at the same time. Both have schrader valve screw on attachments. 78 psi (air) and 88 psi (fuel) are within...

Anyone ever ran across this? I downloaded an Optimax service manual for my 2004 Optimax 135 after replacing a bad low pressure pump. It says the output psi should be between 6-9. I put a t-fitting on...

I’m baffled by my 2004 135 Optimax. It all started a few nights ago on the lake. I idled out of the no wake zone and gave it throttle to get on plane. The motor bucked and shuttered refusing to get...

I’ve got a unique issue with my 2004 135 Optimax. It all started a few nights ago on the lake. I idled out of the no wake zone and gave it throttle to get on plane. The motor bucked and shuttered...