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I know this is a dead thread but for future reference I did find the problem: I had a crank seal and rod bearing on the way out. So if you have this problem CHECK YOUR CRANKSHAFT because I didn't and when my bearing went out it caused some major carnage.

Hi, two friends and I started really getting into jet skiing this year. I have a stock 1985 js550 with a westcoast intake grate and ride plate. One of my friends has the exact same, and my last friend has an older ('89?) 550/650 conversion ski. Long story short is that we want to try some...

I have a js550 that I want to flat deck. While I'm at it I would like to lower my hood, shave the air intake on the hood, and do something with the hand pole (make it thinner or shorten it). I had also read about how chopping 2" to 3" off the back end of a super jet helps it's handling and was...

Yes! ok, turns out that's what it was! thanks! but what do you think about the single cylinder starting issue? It has new plugs, would plug boots/wires be next?

So a bad/dirty ground from the battery to the engine block could cause this?

Ok I was out practicing subs and after killing it (I fell off) it took FOREVER to start, one cylinder would start firstbut only run around idle speed, and only with the throttle pinned. The second cylinder would start if after about a minute I let off the throttle to about 25%. So I started...

Thanks everyone for your help. After taking off the ride plate, intake grate, and checking the coupler, driveshaft, and impeller and nothing was wrong I decided to put it back together. On saturday I tried it just to see if it worked, and it did! The only thing I changed was that I removed...

Ok, I took the flywheel cover off, blocked the impeller with some wood, and I could not turn the flywheel at all. I would take the pump off, except I need an 8 inch 8mm hex wrench and I can not find one anywhere!

O really? thanks special fx because it was like that when I bought it, so when I put it back together I won't re-seal

Ok Thank you! I cant right now as it is late here, but I will tomorrow. Thank you! Now at least I have a starting point.

So Augustaf, you think something got stuck, my engine stripped the threads, and so I should pull the engine and check it from that side? (just getting it clear thank you for the info) This is exactly what I'm looking for. Also! What part would need replacing then? the driveshaft, coupler...

Thanks Dan, but nope. Just went out and checked, real small gap, I'd be worried if it was much tighter. Any other ideas? It was sudden too, like within an hour or so, which leads me to think something broke not slowly wore out. But maybe, idk! thanks for the help I just want to get this fixed...

Ok so I have this weird problem. My ski runs perfectly engine wise; but, it runs exactly like it is full of weeds. Some back story: A friend and I were riding (pretty hard) and we decided to switch skis. After a little while some water got in my tank and we came back and fixed it. When we...

OK! I Think it's just a breather tube, or an emissions thing; because, no air comes out when it turns over, and it runs perfectly so I'm just going to eave it. Went out yesterday and had an awesome time. Thanks for your help guys, I guess it was a false alarm on my end! I'm still learning...

Ok well I posted in the general forum awhile ago about my 550's starting problem. Well I cleaned the carb (probably the first owner to do so, it was FULL of crap); however, I believed the problem is my fuel pump. Today I checked the crankcase pressure, (correct me if I'm wrong but it appears...

Ok thanks, primer on the way. But Jet Skier, what do you mean other problems? Other then starting, and not idling (just havent gotten around to tuning it) I haven't noticed anything else wrong. Thanks!

I'm new to Jet Skis but not two strokes. Having said that: I know the first cold start is the hardest but my ski takes 30+ seconds every time it starts, unless I kill it and start it back up within 5(ish) seconds. So my thought is that when it dies, all the fuel that should be in the line...