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This guy was trying to do the same thing, not sure how it turned out. I was considering myself to do this

https://www.facebook.com/groups/322545721531186/permalink/1663528227432922/

Ive got a 21 gp 1800 svho, I went stage 1+ at 10 hours then stage 2 at 61 hours. I don’t “baby” it, but I’m also conscious of my throttle. I currently have 163 hours and it just ran 86.6 mph this...

Yamaha has a pretty commonly known issue with the transom factory sealant not being very good, and it seems as much as (my rough guess) 90% of people who have water in hull have found this problem to...

You can try to install a shut off valve on the hose that comes from the jet pump to the 4 way. A good idea anyways in the event you need towing. With that shut, all the water would go to engine...

the one I bought was from greenhulk, the aqua sport one. I ride in the Detroit river for most if my riding, and it definitely seems to be better for me and my riding conditions. Without the wedge,...

the wedge wasn’t for the cavitation, it was for my bounce. Once I was in 75-80mph area it would bounce like crazy, especially when full fuel. That’s mostly gone with the wedge now, why I liked it. ...

So, I’ve resealed my transom, which surprisingly wasn’t too bad. I have a stock riva gen 2 ride plate, and gen 2 intake grate. I know Yamaha is notorious for cavitation on hole shots, but I’m...

Op, I’m no jet ski genius, but it sounds like you’re looking in the wrong areas. You previously stated the water discharge for the INTERCOOLER side was “boiling hot”… that water and engine water...

For the intercooler cooling water to be “boiling hot” is a weird uncommon issue. Is the engine/cooling system stock? Normal cooling flow would be from jet pump to X connector, and one line from “X”...

Another possible thing to try would be to pinch off the hose that supplies water into the X fitting from pump, so all the flush water goes forward.

To help there’s more info needed. On your ski, there’s a “pisser” on both sides, left one is oil cooler and right one is from intercooler. How is the water stream on the left side? Have you gotten...

There’s no scenario in which the hull being full of water would drain out thru intake grate THAT MUCH without it being cracked hull…. Find that before any other ideas

I have a 21 gp, and stage 2 tune. The speedometer will read above your “70” magic number, but it’s not accurate as you’d like. They are pulling speed numbers extrapolated from rpm, so once you...

perhaps the battery has finally gotten too low to operate correctly. Although these are non-serviceable according to manufacturers information, I do recall a thread on these forums where a fella...

The info you got doesn’t sound right, the clutch design is a sprag system which would ALWAYS be engaged driving supercharger unless or until the engine gear speed dropped below the supercharger rpm...

here is the page out of the manual showing the original bolts. Loctite 242 is blue. I’d say new bolts would be same torque.

it’s quite possible and very easy to check. Take off the fresh air intake hose side of the supercharger, and try to spin the supercharger impeller. It should only spin one way, if it goes both it’s...

This is my launch, the center area has cleats and rubber guards on concrete so great for ski docking. I’ll attach a guide rope on ski, have bumpers on (if I want, if it’s calm day i usually don’t),...

this thread http://greenhulk.net/forums/showthread.php?t=297654

really sounds very much like a boost problem, k477 just recently posted a thread on checking the hoses and clutch. However, the initial problem of overheat doesn’t fit that scenario. I’m usually of...

I’ve got the 2021 gp1800 svho w/audio. Unfortunately it’s almost worthless above around 30-35 mph. I do find it being nice while riding no wake areas, or in places cruising less then that 30 (which...

lol, I’m stage 2 and 85 feels like I wanna see 90 =P~

eh, not really, I was out this weekend, and not doing a whole lotta heavy throttle (ok, ofc there were the occasional blips :)), I got 5.6mpg on my ‘21 gp svho. 105 miles roughly on a tank

lol, however painful it might look to check, I guarantee it’ll be less painful to find out out NOW the hose is off, instead of after you’ve changed the clutch and the problem persists!!!

You must not have been in the proper area, the stage 1 plus definitely requires additional aftermarket parts. Specifically the power intake, cooling kit and solas 13/20 or 13/18 are listed. The...