Video: Installing a GreenHulk Stage 1 Kit on a 2021 Sea-Doo RXP-X

After many months of waiting, parts are finally becoming available for today’s watercraft. For us, this meant getting the GreenHulk Stage 1 kit installed on our 2021 Sea-Doo RXP-X. With plenty of manufacturers offering performance kits, we decided to introduce our own. Even though the kit is strictly made of RIVA Racing parts, we still pieced together a kit that we felt was a perfect starting point for our Sea-Doo.

With this in mind, we also needed to coincide the modifications with what is currently done to our 2021 Yamaha GP1800R SVHO; with upcoming shootout videos between the two, both skis have to be equally modified for a fair comparison.

The kit includes a RIVA Racing intake, catch can, stainless steel wear ring, MaptunerX Sea-Doo bundle, and Solas 13/18 impeller. These mods are the perfect starting point in our eyes; the intake, tune, and impeller offers a substantial increase in performance while the catch can and stainless steel wear ring add to the watercraft’s reliability. The intake utilizes a larger diameter piping than the factory intake, a velocity stack, and a freer flowing air filter; this combination as a whole flows more air with less restriction than the factory setup.

The MaptunerX “Stage 2 8500” tune optimizes the fueling and timing to support the intake kit and the Solas 13/18 impeller helps put the extra power to use through the jet pump. While this is all that is necessary for an increase in performance, we wanted it to be more reliable than straight from the factory; implementing the catch can and stainless steel wear ring allowed us to achieve this goal. Sea-Doo 300 engines experience large amounts of blow-by; “blow-by” refers to air and fuel being pushed passed the piston rings and pressurizing the crankcase.

From the factory, the pressure is relieved through the intake and recirculates the crankcase vapors, and oil in some cases, back into the combustion chamber. The catch can acts as a holding tank for any oil or vapors being blown out of the TOPS valve, increasing the longevity and performance of the watercraft. The stainless steel wear ring will replace the factory plastic wear ring that is known for premature wear.

The kit includes only a handful of modifications but you’ll want to set aside at least a day out of your weekend to get these installed; the installation process is quite tedious but the fit, finish, and performance achieved is unrivaled! You’ll want to visit the GreenHulk Garage YouTube channel for a detailed installation video! The kit is exclusively sold at the and you can save 10% with the coupon code “Greenhulk” at checkout!

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Greg Gaddis

Greg Gaddis is a die-hard PWC enthusiast. Son of the founder of the worlds largest PWC forum and performance parts store, skis play a major part of his life seven days a week. While his first love are PWCs, his passion for mechanics does not stop there. He has a knack for anything with an engine and can’t help but tinker.


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  1. Scott Clifford Mccrea 13 August, 2021 at 13:28 Reply

    Kevin and team, roughly how long does it take you to do the intake install? 2 to 3 hours?

    Kevin I know this is your site and that is Greg’s video.

    But I also believe Greg is writing for you now…

  2. Scott Clifford Mccrea 13 August, 2021 at 13:37 Reply

    Also I noticed on the inside of the Riva air filter tubing there are a bunch of little plastic sandy bumps. I assume this is from the molding process. They can sorta be scratched off with your finger nails. Is this normal? Do they come off through normal opperation.

    Overall the kit seems very professional.

    Looking forward to getting it installed!

    • Kevin Shaw 13 August, 2021 at 21:10 Reply

      A traditional Scotch-Brite pad from your kitchen will quickly clean up the inside surfaces. Make sure to clean the surface afterwards with a towel so that none of the plastic is swallowed by your throttle body.

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