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The 717 is 85 HP, 787 is 110hp. The 787 is more reliable, has the RAVE valve system, and my fav motor. As long as I’ve been in these engines, not a lot to do with the 717. Change impeller? No, because if you look for more speed, you’ll take it from the bottom end, bogging motor cause not enough...

I have nothing but 787’s in my shop. I started in this forum as a moderator in the early 2000’s. I just rebuilt a 787 for my 87 GTX. It will hit 60 top end. Why go 4-TEC, when I only have one sensor and no BUDS software to worry about. These engines are really straight forward. After reading...

Late in this thread, but from your post, touching the two poles together, likely blew the diode in the MPEM. It’s designed that current only runs in one direction. Don’t ever jumpstart your ski with another, if their engine is running. This will also blow the diode. If you have a working one...

I’m sorry, but no. The area on the pulse line side, should be dry. Maybe a bit of residue, but no oil. The pulse line is a reciprocal pressure, from the stroke of the piston, pushing back and forth, for the diaphragm to pump fuel. If you’re seeing a greyish color, I’d ask if your ski still has...

You never mention your pop off pressure. When you get a kit, it should come with 3 different sets of springs. If the pop off pressure is too high, you’ll likely not open needle valves to flow fuel. Too low, you’ll flood the engine with fuel. The procedure for testing it is in the manual. I may...

All the help, that’s awesome! After reading through everything, I’m going to add a couple things. I have a 97 GTX, and I’ve experienced this before. For my issue, it was the rave valves. The red plug is to adjust spring tension. It should be flush with the black cap. Also, the internal porting...

The description is classic pump wearing ring.

He’s said it has the revs. This does most certainly sound like the pump wear ring. But, I see where you’re going with that. It would almost seem like a big, if they failed to open at the right time.

Reckon I’m going to throw my 2cent in. With it being rebuilt in the last couple years, my gut says it wasn’t torqued properly. Because all mechanics have tricks, I won’t criticize what may have worked for others, but I def would not attempt to re-torque, unless this was within a few days of...

Was this the PTO carb? Sounds like your pop-off isn’t set correct, or a weak spring. Spring to weak, fuel will continue to flood cylinder, choking or bogging engine. For some reason, the PTO carbs are bad about it.

Did you test the magneto?

The 95 XP uses the X4, a very good handling racer. The first year of the 787 was introduced in the XP Limited, 110 hp. It appears you got the 717, 80 hp. I’m not a huge fan of buying used race engines, because of engine life. Any of these could last close to 20 years. Just like a race car, the...

L What an excellent thread, wonderful information, breakdown and expanded views are awesome. I’ll put a couple comments in, that really can be taken with a grain of salt. The carbs have a 3 phase operation. Your first few RPM are on the low speed jets. Then into transition, you’ll be getting...

If you look at the oil system, the oil pump picks up from the bottom of the engine, providing it under pressure to the cam bearings. Once oiled is delivered to the upper part of the engine, it’s all gravity drain back to the sump. I believe the area around ur PTO, is all splashed, no pressure...

Sounds like you knocked that out with ease. I'm not much for the oetiker clamp. In most situations, it's just there to keep the boot or expansion joints sealed, to keep dirt out. Because, I live 100 miles from the closest Seadoo dealer, I was forced to use a bit of red-neck engineering. I've...

READ ALL POSTS< ....VIDEOS........> MORE INFO BELOW Bill, great to see your still around, helpling these people out, getting and keep these skis running. I want to get right to the point. Where did you get this info on rebuilding, jetting and tuning the carbs? Did you take this into directly...

I hate to say this, but you sound like you could have some engine work needed. People get excited when they get a good deal on a motor, start it on land, runs like a brand new one, then put it in water, and it floods out, won't run. If your in the water, and you start it, then shut it down...

This is a while back, but not knowing if you solved your problem, I'd say this isn't a really big issue. You said you did not start it when it was half sunk. So, water likely infiltrated your engine from your exhaust ports. This maybe kinda late at the moment, but maybe could help someone in...

Like stated by Skiasylum, if you look on the back of the ski, you should see the HIN (Hull Identification Number) embossed. The last 2 numbers, will be your year model. But, here's a bit more info to chew on. Seadoo's are color coded from the manufacturer by year they are made. The picture...

Okay... seems you made a few redundant posts. Please, stick to one thread, and wait for an answer.