Yellow 585 Seadoo SP Trouble 1989

[waterboy]

I have a 1989 Seadoo sp that was rebuilt by sbt and I have been unable to get it going for 2 summers. I put a new rotary valve in when I reinstalled the rebuilt engine and I and my dealer have been unable to get the boat running correctly yet! I am frustrated!
Does anyone have experience with this problem? The boat runs poorly under a load in the water and backfires and will not even go fast enough to plane out!

[Bryan Glynn]

What size valve did you put it in and did you time it properly according to the article in our technical section, or the service manual? How does the surface and clearance of the rotary cover look? It must be absolutely free of nicks, scrapes, gouges, etc. - anything you feel with your fingernail is too much. The clearance needs to be checked precisely. Place the valve and cover on the engine, WITHOUT the o-ring and check the clearance between the cover and the valve with a set of feeler gauges. The clearance MUST be between 0.010" and 0.014" or it will NOT run right.

Is it backfiring out the exhaust or the carbs? How does it idle? Does it start ok?

[ June 22, 2001: Message edited by: Bryan Glynn - SBT Webmaster ]

[waterboy]

I didn't know they had more than one size of roary valve I just ordered one for my 1989 model. I don't know where it is backfiring from I will call the dealer and ask.write more after I call.bye and thanks!

[Bryan Glynn]

There is only one correct size for that model, and I just want to make sure you used the right one.

[waterboy]

I E-Mailed and called and read your information to my dealer(Jim's Imports/Wichita,KS) over the phone thanks for your help and I will let you know what happens next. I hope to be swishing down the lake soon thanks! waterboy

[Bryan Glynn]

The next things I would do is verify the stator is assembled correctly and the timing marks are lined up. I would also completely rebuild the carb.

[waterboy]

I noticed when I got my engine two years ago that it had the tube outlet instead of the oval water outlet that the original motor I sent in had. The original motor was an 89 model yellow motor out of an SP and this is a yellow motor too but with the tube fitting instead of the oval. My question is this tube motor still an 89 or is it a 90,91 or something else? The reason I'm asking is I still can't get the motor to run right in the water and I have sanded the cover and now have a gap on the rotary valve space of .030-.032 and I have rebuilt the carb as you suggested. The engine doesn't start easy and backfires from the carb sometimes. The boat doesn't go very fast as all barely planes out. If this engine is any other than an 89 then I need to have the rotary valve aligned at 115 instead of at 130 that the 89 SP was set at right? Does this motor used the same rotary valve as my original motor with the oval inlet? Thanks for all of your help in the past and your continuing help today! [img]tongue.gif[/img]

[Bryan Glynn]

I will take care of you - I know what's wrong - I don't have time to post everything now - check back in 3 hours.

[waterboy]

Thanks man I really appreciate you sticking with me on this one! [img]smile.gif[/img]

[Bryan Glynn]

OK - well, I feel really bad - I thought I had gone back and edited this post but I did not. I mistakenly posted the wrong clearance for the rotary cover - I was confusing inches and mm in my spec.

The CORRECT spec is 0.010" - 0.014" (about 0.30mm).

I know you spent the time and sanded your cover based on my specs, and if you call me Monday morning, I'll swap you for a fresh remachined cover, and we'll get ya going! While you have it off, verify your rotary valve timing according to the guide in the Technical section. Even just to verify that it hasn't slipped.

About the water outlet: there were two 580 yellow case designs, however they do not effect performance at all.

The rotary valve timing is a function of the electrical timing, not the engine. Whatever year your ski is, that is what you need to time it for, as you kept your flywheel and stator. The engine blocks are the same.

[ June 22, 2001: Message edited by: Bryan Glynn - SBT Webmaster ]