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What about heating the entire Engine Short Block (minus Electronics, Carbs, etc.) in an Oven for a few hours at about 350F to 400F? The Cylinder Sleeves may slide, but it might be worth a try...

Yes, ADA Head. That 150 Hp Pump Gas 951 Engine was built by Mark McQueen and installed in an SXR 800 Standup Hull that did 62 mph all day long with brutal MSD Total Loss acceleration. I was the Proud Owner-Operator for a few years till the Whiplash and the Elbow Tendinitis became unbearable...

Was that a typo "Crankcase"? Many drill a small hole in each Rave Hosing/Base to allow EXHAUST to lift the RAVE Blades. And use the same Springs. This works really good. In the Stock RAVE Actuating System, for normal riding and operation, your idea as written, will not safely work because the...

Pull the Pump and see if the Crank shaft and the Impeller will each turn separately. If you're lucky, maybe it's just the Impeller that's stuck.

Is there any risk of the Electrical Current passing thru the Crank and CB Bearings and arcing, causing damage to the Ball Bearing Surfaces?

Genuine Mikuni SBN Kits have the Regulator Diaphragm Center Buttons anodized. The Knock-Off Diaphragms don't. Genuine Kits don't come with Needle Valves. Sold Separately. And the Genuine Kits come with Mikuni Stickers ; )

Was the Bottom End opened, cleaned and inspected? Were new Crank Seals installed? Was an Air Leak-Down Test (8 psi x 10 min) done on the re-assembled Engine prior to installation? Thinking that Metal Debris or a Leaking MAG Crank Seal in the Crankcase is damaging that MAG Piston. Seems like...

With no Power, the RAVE Solenoid is Normally Closed, so that won't work as far as lifting the RAVE Blades for maximum RPMs...

For a quick test, you could back the Ski on the Trailer into the Water and at Full Throttle, manually pull the RAVE Valves fully open/up. If you gain RPM, then the Solenoid Valve/Hose that feeds the RAVE Valves is leaking or going bad. This Solenoid System allows Crankcase Pressure to push the...

You're going to need a Multi-meter to check all the Wires, Fuses and Components. Sometimes the Fuses look good at first sight but the Ohmmeter will tell for sure.

Start by checking the Fuses... But why did the Battery commit suicide? No straps?

Oil Injection is ideal and best as long as the Oil Injection Lines are replaced every couple of years. Because they supply the optimum Oil Quantities for each RPM range. The Oil Injection Pump never fails because it is lubricated by a constant Oil Bath from the Oil Tank. And even if the Oil...

"Draining for a Week" No Bueno... Water-flooded PWC Two Stroke Engines need to be drained and purged of Water right away; then run hard to remove all the residual Water and lubricate all the metal parts. Only a small Time Window for removing the Water and running the Engine after a Flooding...

Pre-fixing? So the Oil Injection Pump was removed and now are PRE-MIXING the Fuel? Did you leave the Oil Tank connected to the two Rotary Valve Gear Shaft Oil Bath Fittings to lubricate the internal Rotary Valve Gear Shaft?

Death by DESS? These Seadoo DESS Keys have a Chip built into them that eventually go bad.

If the Wear Ring is Plastic, it's probably made from Delrin which has good Chemical Resistance against Oil, Gasoline and Grease. The Lubricants will wash off anyway with use. If you're really concerned about chemical damage to the Liner, then use Silicone Lubricant. After manually spinning and...

Partzilla shows the Starter Number as 278001497 https://www.partzilla.com/catalog/sea-doo/1999/gtx-rfi-5887/starter But Seadoo Parts House shows as superseded by 278001936 for $240 bucks 1999 Sea-Doo GTX RFI, 5886/5887 Starter | Fox Powersports Sea-Doo Partshouse

How about OSD Parts? Search Results -> starter : SEA DOO Yamaha Kawasaki Polaris Parts - OSD Marine, Your ONE SOURCE for DISCOUNT Parts!