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I have an 06 Triton TR21 HP with a 225 Pro XS .Originally I had a Tempest 3blade 25 pitch. The Fury's came out and I bought Fury 3 blade 25 pitch. Hole shot was a lot better lost 3mph though. I also...

Never run without thermostats. The motor has to get up to temp. With the Pro XS motors #6 cyl has problem of freezing in the cylinder. The piston will expand faster than the cylinder so when your at...

Yes I believe this engine does have carbon fiber reed valves. With almost 400 hours hours on them I would thinh they are very close to failing. Mine failed at around 350 hours. Your supposedd to...

Change your reed valves .I know by experience.

I have an '06 21HP DC. Lots of chine walk with my 12" hydraulic jack plate. Be sure and get a or make a holeshot plate. Makes all the difference when getting on plane. Top speed came with a 25p...

Thanks Joe

Mine did the exact same thing one time when I installed a new primer bulb in my '06 Pro XS 225 and when I did the plastic liner inside the fuel line wadded up inside restricting the flow...

Thank you. So that eliminates excessive pressure at the reed hinge

No There are no balance plugs in that area. Mercury does show a Stop Plug in that area in their parts diagrams, 6 of them actually but in the service manual while it shows them in the parts break...

Spark plug examination indicated normal conditions. Do to the configuration of the head and spark plug placement, piston dome inspection is really not possible with an inspection camera and I'm not...

I am unable to find the recommended torque spec from Mercury for the reed valve straps so I relied on my machinists handbook. Not knowing the T series I opted for the standard T series at 0.63 Nm...

Forgive my ignorance , but what's a balance plug and where are they located ? Is there another term for them ?

I have replaced the pulse pump with new complete assembly even though I had checked...

I guess you were able to look up the service record to get the hours on the original block replacement.
I no longer have the receipt but I think it just it said replace power head and didn't list...

Seems strange to me also. Because of this I'm leaning towards lean air/fuel ratio at WOT or am I way off course and could it be a rich mixture and contaminating the crankcase ? As soon as the parts...

In 2017 when the 2nd power head failed the computer had 447 hours. It damaged on one reed block, #2 cyl. I'm just guessing because the shop didn't put the hours on the receipt when it was replaced...

Yes and No. When the first reed broke I did not have crankcase stuffers in. Chris Carson warranted the reeds and I bought stuffers at that time. Then 2 hours later #3 reed broke. I replaced ALL the...

I did pay attention to this when I installed the reeds myself.The contact area pattern was made by the reeds with 94 hours on them which Chris's shop did. I didn't do much better at getting more...

Yes the retaining strap does install a certain way and I can definitely say there was nothing improper about the installation when I replaced the reeds and since they lasted 94 hours when Chris did...

Here's a couple of pics.
The powerhead was replaced under warranty in 2010 because #6 piston expanded in the cylinder and the rod went through the block shop said the motor wasn't warmed up enough...

I have an '06 Merc 225 Pro XS S.N. 1B276505 that keeps breaking the reed valves. I had the powerhead rebuilt 2 years ago and now have only 94 hours on it. At that time I had Chris Carson reed valves...