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Yes, I see now. The flame arrestors were put on by a shop when they put in engine #2 and replaced the fuel lines back around 2004-5. The stock jetting worked good after that for many years though. Come to think of it, it did always seem to have a little of that occasional muffled popping at low...

One more thought. If you do take off the carbs, the mounting bolts have washers on them. Make sure you get the washers with the bolts when you pull out the bolts. You have to feel for them because you won't be able to see them. Feel them with your finger and press them against the bolt as you...

The e-box has two metal posts that stick up. The e-box is the plastic box where your spark plug wires originate from. They are for attaching your spark plug boots to when they are not on the spark plug. It grounds them. It wont make the engine crank faster but it will prevent the boot from...

I use Quicksilver full synthetic 2 stroke oil from walmart. Ive never had a problem due to oil. I used to use the Sea Doo oil, but that got pricey and I would always run out on the weekend when the dealership was closed.

Those boats have 951 engines. They don't have rotary valves. They have reed valves. Compression is low, but that could be a weak battery or starter or possibly the test guage. Did you do the compression test with both spark plugs out and the spark plug wires grounded onto their clips on the...

This engine is #3 in the life of the boat, and probably has about 30 hours on it. The second engine I put in the boat lasted about 11 years with the stock carb settings and the tau ceti flame arrestors. That engine lost a cylinder shortly after a head pipe leak, so I assumed it was from water...

I had set both HS adjusters 1/4 out when I assembled it this last time, and ran it with the stock jets (80 lows and 160 highs) that have worked with no problems since I put on Tau Ceti pro series flame arrestors about 15 years and 150 hours ago. For the last 15 years, it has run with the HS...

Thanks for the reply. Ive been opening the hatch and feeling the temperature of the plugs after runs at some different rpms. So far so good. The MAG plug feels slightly hotter than the PTO, but just a little. The engine passed the pressure test when I put it back together and the fuel supply is...

Thanks for the relies. Its a 98 xp limited carb engine. I was thinking to install the egt's just to catch a problem before serious damage occurs in the event of a lean condition or gasket failure. I had a head gasket fail this past summer and it caused some slight wear to the MAG cylinder. It...

Hello all, Does anyone know if egt sensors permanently installed on a 951 exhaust manifold will affect performance due to turbulence or slight restriction caused by the sensor? Thanks in advance for any info.