Seadoo rotary valve issues. Of course make sure your rotary timing is right. This video shows how to repair the Rotax rotary valve cover according to the factory manual specifications. replacing the cover and valve is no problem. It’s safe to say that the most common problems with Sea-Doo’s rotary valve system are improper timing, lack of lubrication, and the notorious brass gear damage. This one is off my personal ski that never had issues starting. This spinning metal plate is indirectly driven by the crankshaft through the rotary valve shaft. That ski was a little difficult to start in the water so I suspected a rotary valve issue Sep 16, 2005 · Seadoo Rotary Valve damage - Advice needed 09-16-2005, 09:24 AM Hi Folks, I'm helping a friend fix his 1990 Seadoo SP. Sometimes it fires right up other times it doesn't want to start at all. thanks Last edited by a moderator: Sep 27, 2011 In this video I speak briefly on the function and importance of the rotary valve shaft on a Sea-Doo watercraft, the engine here is a 587. Jun 1, 2013 · The rotary valve cover, rotary valve and the engine block its self have major scoring. There was another that looked just like one from a 1996 GTI with the 720 engine. I have a head scratcher here. Jun 12, 2009 · Similar threads T 717 Rotary Valve Cover tvpierce Aug 1, 2025 2-Stroke Sea-Doo PWC Forum Replies 14 Views 1,178 Aug 8, 2025 tvpierce Dec 8, 2005 · The sea doo manual said it is a 159 degree? I think it is a 147 degree? This is out of a 1998 gts. My question is what can I do about the damage on the block? Post topics relevant to Sea-Doo personal watercrafts in this forum section. Jan 21, 2026 · 13 reactions · 12 comments Seadoo rotary valve shaft gear repair cost estimate needed Jeff Nier Sea•Doo Owners Official ™️ 5y · Public Sep 15, 2020 · This isn't the first rotary valve I've seen like this. Plugs are black, Idle is rough, Running on the main jet ie 5k and up is great and smooth but everything on the low speed circuit seems overly rich Jul 6, 2018 · Have you checked compression ? What makes you think it’s the rotary valve ? Low compression or lack of fuel are the usual suspects if it won’t run in the water. Replace the rotary valve as it looks bad. While timing the valve is a relatively simple task, the latter requires you to disassemble the entire engine and invest in a new valve gear shaft assembly. Aug 1, 2022 · This is a boat so the water routing could be different and skis don’t have the fiberglass resonator. Therefore, it does the same job as the intake valve system on 4-stroke Jul 9, 2017 · On a 787 what symptoms would you attribute to a rotary valve shaft seal leak that would only leak while running. I've found the problem that was causing a binding and clicking (popping) noise when the crankshaft was manually rotated clockwise. Cover looks ok. If that groove in the case picture connects the two ports it will leak vacuum pulse and the cases are trash. If not installed properly, your ski will suffer poor performance. In this video I show you how this is done on a la Sep 16, 2005 · Seadoo Rotary Valve damage - Advice needed 09-16-2005, 09:24 AM Hi Folks, I'm helping a friend fix his 1990 Seadoo SP. I am being told it is a rotary valve problem. Can they be resurfaced? Procedure for Rotary Valve Timing. Could this be correct? Also if I replace the rotary valve should I take the cover to a machine shop and have it milled down? And one last question, is there any gaskets that need to be replaced when you replace the valve? The rotary valve is the fuel intake valve on vintage 2-stroke Sea-Doo engines. The main idea behind Sea-Doo’s rotary valve is to control the intake’s opening and closing. . My question will be whether the damaged crankcase can be reused. This procedure describes the proper way to install a stock OEM Sea Doo rotary valve. Rotary problems are usually accompanied by carb spray and backfiring. i don't think this is normal but if someone could tell me that would be great and also what caused the grooves. Please help. If you have an aftermarket one, use the manufacturers instructions for installation. Liking and sharing Jan 28, 2005 · I have a 96 Sea Doo XP and I am having a starting problem. Can they be resurfaced? This instructional video shows you how to install and time your rotary valve on your Sea-Doo. Also could this scoring have cause the rotary gear to strip? Thank you, Jeff Bill O'Neal2 PWC Professional Joined:Nov 2003 Posts:6846 Share Tweet #8 01-03-2006, 01:32 PM Re: 717 rotary valve gear 1998 gts Sep 20, 2011 · #1 i think i have a huge problem there's grooves in my rotary valve on my 1993 seadoo xp hi there everyone i just took off my rotary valve for inspection and there are grooves all around it. zbw dlg xre elb hlm jua tzo kwx fdu ucv sih vbd ehw jpj pbh