If the porting is performed by someone with very little 550 experience, that may be true. Fairway Chevrolet-Buick-GMC put the new ZL1 up for auction, with proceeds going toward the Southern Nevada YMCA. All of our testing with 550 reed engines has shown that competitive and reliable horsepower levels can be had without excessive compression, or spinning the engine into the twilight zone rpm range. the mariner has a tinny dirtbike sound, it cakcles when i jump, or clear water. HEAD GASKET SEALING The amount of head gasket sealing area between the cylinder bores and the through stud holes in the 550 cylinder is very narrow (even narrower than the 440). However for the recreational rider, we recommend the lightening option. EXHAUST SYSTEMS While the Sleeper kit utilizes the complete stock exhaust system, the 550 Hammer kits are intended to be used with after market exhaust components. I have a Westcoast exhaust, manifold, and waterbox. If your machine will be operated on only smooth water, the blueprinting will offer little improvement for the money spent. A 15.0 or 15.5 Skat Trak impeller and, along with nozzle boring, are mandatory modifications for all Group K 550 kits. jet550 PWCToday Regular Join Date: May 2007 Posts: 95 Share Tweet #2 09-18-2007, 08:37 PM Re: 550 waterbox and winterization you can remove it from the hull and drain it, or put in a heated place so it wont freeze BREAK-FIX-RIDE Why would you want it quite?? About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . However when they became even a little wet, they offered very restricted air intake ability until they were removed and allowed to dry out. The 550 style pump delivers the force of thrust to the hull through the pump case mounting points, not the driveshaft. The porting mods used in all our 550 kits is the result of many months of performance and wear evaluation testing. Safe steering, beyond this speed, is done with a combination of body english and proper weight transfer. If value for the money spent is a high priority, a light driveshaft should be your last modification. (Your stock intake manifold must be bored slightly to accommodate the larger throat diameter of the 42mm carb). Piston clearance inspection is available on request, and cylinder boring (using pistons furnished by you or us) is available in oversizes of .020and .040. It is simple and inexpensive for us to size your worn iron cylinder to accept a pair of tight fitting 91 type pistons in std., 1st and 2nd oversizes. . The much lighter aftermarket aluminum charging replacement flywheels offer an incredible increase in throttle response along with an equally incredible price tag. ^^that seems to be the general consensus the more you mod the more the box effects performance,but on a stock to mild 550 your not gonna notice a difference, mariner boxes are fairly quiet when wet, but dry that thing is LOUD. Peak speed - 47.4 mph HAMMER 105 (octane) - Intended for the serious modified class racer, this kit offers national class power output along with the best in race level reliability. Our tests have consistently shown that most head gasket leak problems usually lie with the cylinder surface and the gasket seldom the head. This is not what any recreational rider wants. All our 550 kits require the disabling of the stock rev limiter device, however the design of our modifications insures that your 550 will not need to be revving to make the bulk of its power. We recommend that a stock waterbox silencer be used on the Sleeper and Hammer 92. In fact, the free floating bulkhead bearing system in the 1990 model 550 sx is so flexible, it virtually eliminates the need for shimming the engine and pump altogether. Something went wrong. I haven't seen one, seems like everyone I know with a 550 has westcoast mariner or coffman's 1995 FX-1: Pro-Tec chamber~Skat swirl~Pro-Tec plate~Blowsion Destroyers, All Material Copyright 2009 Watercraft Superstore. For a later model 90 machine thats not a problem, however there are many 550s with four or more seasons on the stock crank. As a result they work excellent. Well, price-wise it remains very competitive, with prices kicking off at a very modest 8k. Some parts of this page is temporarily unavailable. The single 42mm carb has no troublesome linkage, and features the easy two screw mixture tuning. We strongly recommend that you read this entire pamphlet before deciding which modifications are right for you and the kind of riding you intend to do. The Jetcraft Eng. Charlie. 300/440/550 JS550 bogging out, seems like water box is full? Engines intended for moderate recreational use can easily live with .004-.005 set-up. '88 Js550 bogging down. Suggestions? : r/jetski - Reddit 1996 2023 Group K. All Rights Reserved. These early housings were adequate for stock machines, but fall short badly for high output use. If your considering modifications, and you doubt the integrity of the crankshaft replace it. Hope to see you all on the water! The engine compartment of your finished 550 Sleeper will look 100% cosmetically stock. The store will not work correctly in the case when cookies are disabled. The Coffman systems have been designed specifically for the 550. Coffman exhaust. reading more and you also run the risk of serious overheat from uncooled exhaust so you are correct in not wanting to remove the water box. (SEND head, cylinder, manifolds intake and exhaust, carb, flame arrestor, and pump exit nozzle), SLEEPER PORTING, DECKING & MANIFOLD MATCH, ARB INTERNAL CIRCUIT MODIFICATION (PARTS & LABOR), CYLINDER PORTING, DECKING & MANIFOLD MATCH, CARB INTERNAL CIRCUIT MODIFICATION (PARTS & LABOR), COOLING SYSTEM UPGRADE AND BY-PASS ASSEMBLY, JETCRAFT ENG. We recommend that a stock waterbox silencer be used on the Sleeper and Hammer 92. The Fora platform includes forum software by XenForo. This 42mm carb bolts directly onto the stock 550 intake manifold where it works in concert with the small intake runners to provide throttle response and acceleration that few dual carb setups will match. For the Sleeper, we provide a double mesh stainless steel screen to replace the pumice stone element in the stock flame arrestor case. Strong low speed power is needed to permit smooth controlled turns, as well as getting heavier riders up on plane. Riders under 120 lb. Reddit, Inc. 2023. Is this possible??? The Supermini segment is a very competitive one, and Hyundai has sold relatively well to date, based mainly on price. Our 550 reed engine modification kits are as follows : STD KAWASAKI JS 550 Peak waterspeed (sea level, flat water) 91-93 37.8 mph, SLEEPER Intended for the average recreational rider, this engine kit consists of modification to existing pieces only. I love the sound of my skis. A waterbox make very little difference in performance, if you are on a river or a lake with lots of houses please do the sport a favor and run a stock waterbox, the raspy mettalic sound of a aluminum waterbox tends to piss people off. Under the loads of stock power output, that four year old crank might last another two years. check out the. All orders prepaid with a cashiers check or money order will be returned freight free via ups ground service anywhere in the continental United States. A forum community dedicated to PWC owners and enthusiasts. For customers who prefer to prepare their machines with a dual or oversized input systems, we can also prepare the special exit plumbing needed to make those systems work. Putting together a JS550 | Page 2 | Personal Water Craft Forum Peak waterspeed ( flat water) 45.8 mph, HAMMER 92 (octane) Intended for the serious recreational rider, this 550 kit shares many of the Sleeper kit mods along with a cost conscious selection of bolt on parts. Copyright 2021-present RIVA Racing. muffler/rear exit tube gave our 550 test boats the best overall performance and best sound levels when resonator mufflers where used in the nose of the boat. 300/440/550 - sbn44 settings 83' js550 | X-H2o Making good increases in the acceleration and peak speed of a 550, without hurting reliability, is not difficult. This Hammer kit requires 105+ octane fuel at all times. In fact even among racers, 550 modifieds with lots of bottom end power, and just reasonable top end, are always more desirable. DRIVELINE The force of impeller thrust of the 550 pump is delivered to the pump mounting points at the back of the hull , not to the driveline bearing holder mounted on the back wall of the engine compartment (like the 440). The 150-lb. That, along with the high price tags, made them a very poor value. The next biggest performance problem is the lack of peak water speed ability compared to all other crafts. The 550 pump delivers the force of thrust to the hull through the pump case mounting points, not the driveshaft ( like a 440 style pump). Our full catalog of parts can be accessed from the above menu. Sealing on an area that narrow is easy on the low compression/low operating temperature stock engine. CRANKSHAFT The stock 550 crankshaft is actually a reasonably well built unit. AIR LEAKS The lower end of your 550 should be totally air tight up to 8 psi. GROUP K offers a simple to use pressure test kit that allows you to quickly test for any air leaks that your engine may have. Water Box | Personal Water Craft Forum Not completely sure of how the system works from end to end, but ( and different skis could be plumbed completely differently ) , if the . For any further questions you may have regarding your Sleeper or Hammer kit, you are welcome to contact us directly for assistance. Keep a careful eye on your pipe, waterbox, and engine for excess heat after changing the routing. TJ that 550 OEM H20 box is going to rob a ton of power from that 650 motor. However when they became even a little wet, they offered very restricted air intake ability until they were removed and allowed to dry out. The organizers of Pacific Coast Dream Machines have known this for the last 20 years. Contrary to rumor, the stock waterbox yields very good overall power levels in all pump gas applications. These cylinder and head specifications play the key role in determining the amount of overall power that the engine can make as well as the quality of fuel that you must use. As a result, no bulkhead bearing support is needed (like on all 440s). For a later model 93 machine thats not a problem, however there are many 550s with one or two hard seasons on the stock crank. The opening on the stock flame arrestor also matches perfectly to the throat opening of the new 42 Kiehin carb. 89 550PP, 44MM SBN carb, Westcoast exhaust, Mariner head, OceanPro rideplate, Quadra-Fin rideplate, Solas 14x19 prop, Tuned Pipe, 147 RV, Mariner intake manifold , 44MM SBN Carb, K&N performance arrestor, 91 XP hood, X4 Hull- R&D rideplate, NuJet prop, RAM cup holder, Commercial Tiny Tach, If this is your first visit, be sure to Some exclusions apply. Good luck with a solution. When recreational riders purchase the same parts and modifications used by these racers, the unfortunate result is the same unreliable all top end engine that the racer has. Sealing on an area that narrow is easy on the low compression/low operating temperature stock engine. Car & Truck Safety & Security Accessories, Mariner Waterbox Kawasaki Js440 Js550 550sx Jet Ski, item 1 MARINER Waterbox Kawasaki Jetski JS440 JS550 550SX, MARINER Waterbox Kawasaki Jetski JS440 JS550 550SX, item 2 KAWASAKI JS440 JS550 550SX 300 JS jet ski EXHAUST HOSE WATERBOX 550 440 JETSKI, KAWASAKI JS440 JS550 550SX 300 JS jet ski EXHAUST HOSE WATERBOX 550 440 JETSKI, item 3 KAWASAKI JS440 JS550 JETSKI JET SKI RIGHT / ANYWHERE SIDE EXHAUST CONVERSION, KAWASAKI JS440 JS550 JETSKI JET SKI RIGHT / ANYWHERE SIDE EXHAUST CONVERSION, item 4 Kawasaki JS-440-550-sx Jet-Ski Handle-Pole Shock Hood PAD w/ 3m Glue In stock, Kawasaki JS-440-550-sx Jet-Ski Handle-Pole Shock Hood PAD w/ 3m Glue In stock, item 5 kawasaki js 440 550 jet ski nose brace, item 6 KAWASAKI JS440 JS550 550SX 300 JS jet ski EXHAUST HOSE WATERBOX 550 440 JETSKI, item 7 MARINER Waterbox Kawasaki Jetski Js sx 300 440 550 jet ski muffler exhaust, MARINER Waterbox Kawasaki Jetski Js sx 300 440 550 jet ski muffler exhaust, item 8 KAWASAKI JS440 JS550 550SX 300 JS jet ski EXHAUST HOSE WATERBOX 550 440 JETSKI, Honda AQUATRAX Custom Open Straight Through Exhaust Pipe System R-12x, 5.0 out of 5 stars based on 3 product ratings, SeaDoo 787 800 Exhaust Pipe Gasket GSX GTS SPX XP Challenger Speedster 290931500, 5.0 out of 5 stars based on 8 product ratings, Kawasaki 88-93 Jet Ski 650 SX 88-94 X2 Exhaust Pipe Outer Coupler Muffler Joint, 5.0 out of 5 stars based on 1 product rating, Honda AQUATRAX Custom Open Straight Through Exhaust Pipe System F-12x, SEADOO 951 Exhaust Mounting Bolts Hardware Pipe to Manifold 947 GTX XP GSX, 5.0 out of 5 stars based on 4 product ratings, 5.0 out of 5 stars based on 5 product ratings, OEM 2022-23 Yamaha FX WaverRunner Speaker Mount Adapter Kit F5G-H81M0-V0-00, Yamaha 62T 760 Exhaust Manifold Gasket 701 64u 64x Waverunner Wave Raider HD, 290950253, 420950253 Exhaust Pipe Gasket ALL 1990-2001 580 587 650 657 717 720, Sea-Doo PWC and Jet Boat 947 and 951 Carbureted Engine Exhaust Rave Piston, Sea Doo Exhaust Manifold Gasket 785 787 800 XP 1995-1997 95 96 97 290931480, WSM Seadoo 800/951 Exhaust Hose 1998-2002 GTX RFI GSX LTD LRV RX Used, Set of 2 SeaDoo Exhaust Manifold Gasket 720 Challenger, Explorer, Speedster / SK, Boat Engines and Motors for Kawasaki Jet Ski X2, Boat Engines and Motors for Kawasaki Jet Ski Ultra 150, Boat Engines and Motors for Kawasaki Jet Ski 650 SX. If value for the money spent is a high priority for you, a light driveshaft should be your last modification. may experience better results with a 16.0 pitch on the Hammer 105 only. PISTON CLEARANCE Its common for a new JS 550 reed cylinder to have as much as .005-.007 of piston to cylinder wall clearance. Our porting modification for the 550 kits has been developed to provide a wide powerband with strong and smooth acceleration at all water speeds. These resonator mufflers, used with the stock rear exit exhaust will easily pass the IJSBA sound level limits. There are many aftermarket companies that build high rpm and high compression 550 race boats for their sponsored team riders. While hull truing may sometimes improve this high speed handling situation, it cannot completely eliminate it. Just beginning to look for a new/used water box (87 js550) - . In the past, cylinder porting has received an undeserved reputation as a modification that causes a loss of reliability and engine life. Kawasaki JS 550 - Engine Modification Kits - Group K I bought an old 1985 js550 a couple of weeks ago and have got it running.. trouble is the previous owner removed the water box. Kawasaki 300 Sleeper Engine and Pump Mods, Kawasaki JS 550 Engine Modification Kits, Kawasaki SXR 800 & SXI 750 849cc Big Bore Mods, Kawasaki SXR 800 849cc IJSBA Stock Class Upgrade, Kawasaki 900-1100 Sleeper Kits for Triples, Kawasaki STX 1100 Di High Performance Mods, Kawasaki STXR 1200 & Ultra 1350 Single Pipe Engine Kits, Sea Doo 951 GTX Di High Performance Mods, Yamaha 633-701 Recreational Engine Mods, Yamaha Super Jet 845cc Big Bore Hammer Mods, Yamaha 1100-1200 Sleeper Kits for Triples, Yamaha 1200 GPR-XL-XLL Recreational Mods, Competition High Performance PWCs for 1998. THE GOALS OF MODIFICATION The goal of every GROUP K modification is to offer the maximum possible overall power increase while making the minimum possible loss of reliability and power band range. Shop Today! A finned ride plate can give added stability at high speeds. Many other after market companies simply sell their 440 combos for the 550s they often work very poorly. The unusually heavy flywheel of the stock 550 slows throttle response and acceleration. Most orders have a 1-3 day handling time. But how will it fair with the i20, which is much more Euro mainstream? The intake mesh of the stock arrestor is so well guarded in the engine compartment that it is exposed to very little water spray. If the cylinder is bored to an oversize, that critical area becomes narrower yet. Peak waterspeed (sea level, flat water)82-85 43.8 mph; 86-90 45.1 mph, HAMMER 92 (octane) Intended for the serious recreational rider, this 550 kit shares many of the Sleeper kit mods along with a cost conscious selection of aftermarket bolt on parts. I'm getting close to finished on my 550sx pp project. Both Hammer kits yielded the best low end and mid-range power using the Coffman Climax pipe (fits on 86-93 550 manifolds). Aftermarket grates are recommended for all kits, however brand is not crucial. 1992 Kawasaki 550sx - Yamaha 650 Motor Rhaas Swap kit, Intake Grate, Ride plate . PACK YOUR PARTS CAREFULLY !! Cars UK [rating:3.0] RIVA Racing Online Performance Parts & Accessories js550 waterbox for sale | eBay Speeding up throttle response in this way has diminished the need for lightweight flywheel total loss ignitions. In our tests, the popular K & N flame arrestor replacements performed well as long as they were perfectly dry. Under the loads of stock power output, a two year old crank might last another year. All Group K porting includes matching of the exhaust manifold. The porting mods used in all our 550 kits is the result of many months of performance and wear evaluation testing. 20 results for js550 waterbox Save this search Shipping to: 98837 Shop on eBay Brand New $20.00 or Best Offer Sponsored See search results that fit your vehicle Select Vehicle Kawasaki 440 550 PJS waterbox JS 550SX Vintage Jet Ski Performance Exhaust Pre-Owned $200.00 or Best Offer +$13.25 shipping 12 watchers Sponsored All other orders will be billed to a visa/master card or sent freight collect cod cash. Along with that, all Hammer kits and over bored Sleeper kits are recommended to be assembled with the durable and reusable .040 solid copper head gasket. ORDER INFORMATION: SEND ALL PARTS REQUIRED FOR MODIFICATION VIA UPS TO: GETTING THE WORK DONE Most customers send GROUP K the parts needed for modification via UPS, and then do the engine assembly work themselves. However engines with deteriorated crank seals or brittle intake gaskets can allow outside air to leak into the lower end during operation. Skickat frn min E5603 via Tapatalk Tags: None restosud PWCToday.com Is My Home Away From Home Join Date: Oct 2006 Posts: 2205 Tweet #2 06-13-2017, 06:53 PM Re: JS550-B1 waterbox delete? Mariner or WestCoast. How did you determine it was the water box ? The reliability of the total loss ignitions weve tested has been so poor that we do not recommend them to anyone for applications. Piston clearance inspection is available on request, and cylinder boring (using pistons furnished by you or us) is available in oversizes of .020and .040. 09-02-2019, 09:21 PM. 1983 Kawasaki JS550 starting issue - PWCToday Surprisingly they offered only slight increases in overall performance (about 1 mph). We also do complete engine and pump assemblies for customers who want a finished unit ready for installation. Kawasaki JS550 js550SX JS 550 JS440 Kawasaki 650sx ignition
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