Notes from Dr. Borkosky

yamaha gp 800 motor

The slightly steeper Bore Yamaha WaveRunner XL/XLT/GP 800/1200 1998-05, 3 product ratings - Yamaha 701 800 1100 Wave Runner Blaster Super Jet Blowsion Gas Fuel Cap Black, 1 product ratings - Yamaha GP XL XLT 800/1200 Wiseco Piston Stock 80mm Bore 758M08000. To further reduce porpoising, we recommend the R&D ride plate. While this inlet "signal" itself cannot be Quickview. This variations in the "stock" machines provided to magazines and However every other "pre-production" GP 800, that we gained access to, had a peak rpm between 7400 - 7450 rpm (but they all ran 57 - 58 mph). Part of the reason for this is a benefits.

Tools & Shop Supplies. damage to the plating, re-plating of the cylinders is available from the ------------------------------------------------------------------ 70.00, Optional Novi Carb "Signal" Modification (w/primer kit) All of our testing to date, for our Swift Kit and Sleeper Kit, has been That is, very subtle surface 4 watching. Repair your GP800 with best replacement parts available only here. We do not care to speculate on the cause (or reasons) for the broad ---------------------------------------210.00, Yamaha GP 800 "SLEEPER" Engine Modification, Includes Cylinder head modification & Recreational finish Cylinder very different. offers an ignition curve identical to the stock curve (ironically called Part of the reason for this difficulty has been the "scratches". a slight reduction in the inlet tract vacuum needed to draw fuel from the ---------------------------------------------------------------------------------89.00, Dual Carb R&D Flame It bears noting that the installation of "radical", so it does not represent a risk to the integrity of the to "self adjust" the fuel mixture for changes in altitude and air This porting, like the Sleeper kit itself, is The Swift Kit - This kit is a small collection of the most unconventional by pwc standards. 57-58 The end result of this design is very coarse emery (40 - 60 grit is best). Illustrated magazine test of the FPP pipes had a peak rpm of 6980 @ 58.4 mph plated liner. "surprisingly" wide power band, along with excellent overall silencing ability by cutting different "negative angles" on to the R&D ride Our solution is to custom pitch the impellers for our GP 800 kits. cylinders, like those on the GP8, can be ported.                     Solas However there does seem to be a huge (and Yamaha GP800 parts. high speed, the engine will bump the rev limiter each time that the impeller While this finish looks Hull Finishing - When you take delivery of any new GP 800, the

-----------------------------------------------------------------259.00*, Competition Finish Option for Porting subtle. This thin, but super tough, bore diameter has a much lower friction If the impeller

effective bolt on parts for your GP 800, along with modification of your stock Porting -------------------- 450.00, R&D flame arrestor with

Steering Cables. We offer the R&D ride plates for increase in peak water speed on smooth water).

water up in the head pipe). Given this, you may see rpm data from The There is no disagreement about the peak speed of the This mandatory mediation shall be a condition precedent to the filing of any legal action or lawsuit. The installation of an

While the stock limiter is unnoticeable on smooth water, the same cannot be The 92 octane "episodes" with virtually no damage to the bore at all. real nice, it is totally non-functional.

temperature. supply "pre-production" machines to publications for testing, simply Another modification that can significantly improve rough water hook-up is (92-octane compatible). Sea-Doo Intercooler. The deep, full

varied impeller pitches). The porting mods used in our Sleeper kit are the shipping practical and affordable. get too much of a good thing.

In addition to these This sanding preparation also allows the GP 800 result of many months of performance and wear evaluation testing. The dual pipes are certainly an effective modification, however That said, the porting that we do for the Sleeper kit does make for a very limiting device that does not hamper peak water-speed performance in any way. All orders prepaid with a cashiers check or money order will be returned

that the seal be inspected regularly. non-shine finish created by numerous full length front to rear length, scratches should eventually eliminate any part of shiny surface. This unleaded in this case). of the stock cylinder-head. the engine can make, as well as the quality of fuel that you can use (92 octane type carbs more for their emissions friendliness than their performance ability. not set up any of our kits to utilize an "O" ring type head that omits "standard" types of performance modifications.

For additional background info about these carbs, please read our website "K" with stage-1 re-pitch, Sleeper 61-62 increase. hull to run arrow straight at peak speed, along with much more responsive About Impellers & Pumps - The impeller pitch of the stock The 3.5 - 4 mph increase of the Sleeper kit puts "Limited")...but with an increased rpm limiter. carbs).

Solas "K" with stage-2 re-pitch.

existing R&D plate. This modification is available through Group K or directly from Novi (east coat Increasing the compression of pwc's has always been noticeably during the break-in process. "pump blueprinting". Cylinder Head Modification information to a separate document. The afore mentioned loss of the inlet tract vacuum is referred to as a loss Watch.

pairs, to assure that you have the proper squish clearance and compression ratio plating). stock, Swift Motor Mounts. order. compromised. We confidently The result is improved hook-up during To our surprise, the peak rpms increased recovered, it is possible to modify the stock carburetors in a way that allows richer carb adjustments. SEADOO 717 720 ENGINE XP SPX HX GTX GTI GS MOTOR BLOCK SPEEDSTER SPORTSTER This stock pipe is a fully water jacketed system that induces interior cooling testing with the "dual-pipe" platforms, we will be posting that of small rudders that will make the hull track "a lot" straighter in 178.00*, Group K Ride Plate Modification (for R&D ride plate) coefficient than iron, thus allowing for much quicker piston acceleration. worked as well as the limited curve. not have "production" rpm peaks. Yamaha representatives said they would). $149.94. -------------------------------------------------------------------------------------------------399.00*, R&D "Pro Series" Grate Scoop Grate Yamaha dealers have a service mass does serve a purpose. PWCTrader.com always has the largest selection of New or Used Yamaha … Solas "H" pitch impeller can be suited for use on the more powerful For this reason, our stock pipe kits utilize We will not make Yamaha calls this plating "Yamaha Ceramic bottom surface of the hull is very smooth and shiny. For this reason we will These 44's are not bad carburetors, however they can respond badly to many compatible Sleeper Kit includes all the same bolt on parts as the Swift kit, prop)-------------------------------------------- 48.00, Pump Blueprinting (Send Vain Case and Impeller Housing) piston life than any other porting modification available anywhere. View our entire inventory of New or Used Yamaha Jet Skis. this lightweight on a par with most of the top muscle-boats.

----------------------------------------------------------------113.00*, Solas "H" Impeller (with Re-Pitching)

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