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The “Y barb” is not used and neither are two pissers on the right side of the ski, only the left (port-side) pisser is used coming from the oil cooler.

Not sure if the head issue has been resolved or what the cause is but these Yamaha skis do have open loop cooling and they can’t be as consistent as a closed loop system therefore I believe it’s good...

My CR clutch has over 220 hours with stage 2 Riva kit. Stock clutch lasted 80 hours.

This works for me. Found this hook for under $2 at West Marine, UV stabilized Jiffy Reefing Hook by Ronstan part # PNP84. Drilled a small hole in pocket for Bungee cord or Oring. Rivet the hook to...

Sounds like you might have a cracked cylinder head, my stage 2 did the same thing at 130 hours. After blocking off the exhaust and thermostat housing waterway passages with some homemade rubber...

I've had real good luck with the RL-HM026A tachometer. It's very easy to read in bright or cloudy daylight, stays dry, very accurate and the price is less than $20RL-HM026A

Not exactly sure what you're experiencing but it could be supercharger surge. My Tial BOV had an 8lb spring and shuddered between 10-20ish mph until I replaced it with a lighter 2lb spring. I believe...

My '17 GP1800' with original/OEM clutch lasted 80 hours running Riva stage 2+@ 87mph, I then purchased a "CR" clutch from Dean, drilled the holes in the bolt per instructions and it currently has 170...

I’ll assume this is a GP1200 that you’re referring to. I don’t believe this is from water ingestion, it looks like oil starvation to me. Did you check the oil injection lines that feed each cylinder?...

With the valve cover off, reach in there with a long screwdriver or a stick and just tap or bump the plastic guide which rests against the tensioner, this will release the tensioner and will apply...

Does the engine crank over or is the starter just spinning the flywheel? Stock flywheel bolts are known to break on these engines.

Very cool. Any welding, cutting or notching of the bar ends involved?

I had the Worx sponsons on my GP1800 for two rides before removing them. They were very aggressive in low position or tame in upper position. I noticed that the ski was a bit less stable with a...

I sealed my Gp1800 transom plate with 4200 and it started leaking after first or second ride so I did it again with 5200 fast cure and it fixed the issue although future removal of transom will be a...

http://greenhulk.net/forums/attachment.php?attachmentid=446355&stc=1
I’ve had no issues removing several impellers, (knock on wood) including the stock impeller while using this wood block method....

I used a hot glue gun to fill the voids in the rubber seal.

Riva does say to run the dedicated intercooler water exit line from I/C to the oil cooler then exit at left side of boat only, but I ran my straight into the right side pissers just like stock. I...

http://www.greenhulk.net/forums/attachment.php?attachmentid=425211&stc=1

You currently have a stage 3 FZR with a SVHO engine and you're considering downsizing to a three cylinder engine and then adding a stage 3 kit?
I would recommend riding a modified GP1800 prior to...

HOW MANY HOURS ARE ON YOUR SPARK PLUGS?

I had similar issues with my Greenhulk stage 2, MapX, aggressive tune GP1800 for 2nd half of summer, eventually only getting up to 8500rpms and getting...

I was contemplating another location but after thinking about it I installed mine exactly where Riva recommended. You will need to disassemble the exhaust exit but that's pretty easy, any other...

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Wow, that really sucks, sorry to hear it. That is some serious cracking of the hull going on. Yamaha really seems to have missed something here, they need to redesign or reinforce that area...

Try to wrap the plates in wax paper and set them onto the fresh fiberglass work, remove following day and you'll have a perfectly flat surface with no sanding required. page 28 this thread. I prefer...

Not to many people are discussing this lately but I'm still glad I did mine "page 28", #276 just makes sense to me as it seems to be a potential issue, especially at increased speeds!

Can also fill the intake grate with an epoxy filler and retain the factory rubber strip, then seal it up with silicone, it really helped with cavitation. Transom leaking small amounts of water into...