long convo about rotary valve prob. +

[jmartin915]

So then while pulling the rotary shaft out is there anything else I would need to do or know before proceeding pulling it out. I am using a make shift puller with a bolt that matches the thread inside the rotary shaft and a much larger socket (so it will not damage the splines on shaft outside the motor). Also the manual shows the pistons still in the motor when removing the retaining ring but when pulling the shaft there are no pistons. Am I going to have to pull them too?

I may have solved the problem but have to wait for some parts (I damaged the coils beneath the flywheel removing it). But I think the problem was the cooling temp sensor. Before tearing into the engine...When the machine was started it smoked a bit but then after running would die. I believe the sensor would cause the machine to run to lean when the motor was cold but when the machine was hot it would dump lot of fuel in to cool things down...which would explain why my new spark plugs would be getting wet (really wet). The faulty sensor would flood the engine. Am I on to something?

[QUOTE: Seadoosnip;] No, your not onto something, not if your talking about a 98 model 717. There are no sensors on this model engine, that support any changes to the engines performance, just a temp sensor that will trigger a beeping alarm, if you run the engine hot. Seems you may have a fuel issue, possibly in the carbs or you may have bad compression. The smoke is coming from seepage of the rotary seals, which is normal as the engine wears, getting older. When it gets so bad, that the smoke doesn't clear up, then your going to leak so much into the pistons that it will eventually hydrolock on you.......

 

[timmyboy76]

so, you have the motor upside down, pulled the bottom case off, right?, then pop the ring, and see if she'll pull out...

 

[robin savell lloyd]

I am completly lost on this one. Why in the world are you taking apart your rotory valve? Could you please repost the problem you are having with this engine.

 

[timmyboy76]

Robin,....stripped brass gear...

 

[robin savell lloyd]

I am still lost as this is another one of his threads. I got to the rotary valve and inspected it...the brass gear looked great! To further trace my timing problem I inspected the valve plate and cover and they too were perfect. What else could make a jet ski (that was running great) to all of the sudden in the middle of the lake just take a crap? It would still run just very slow. It wouldn't turn over for a few tries but then did but would not stay running. Can someone please help? :cheers:

 

[jmartin915]

Robin, this is the exact same problem I had. If I find out what the prob. is...I'm pretty sure you're gonna find out too. I had another guy tell me it was the seals on the r.v. but that would not explain the engine not wanting to run...unless it would omit an enormous amount of fuel past the r.v. plate, through the valve itself...which would explain why my spark plugs were really wet. Just thought of that one...maybe replace the seals...they're not too expensive. Just timely to do...

 

[robin savell lloyd]

How far have you taken your engine apart? You may be doing unnessary things please take a breath if you have not tore your engine apart to far and listen to all replies and try and find the ones that make sence. I know that I have given bad info by mistake. I do not want to see you waste time and money as I have done over the years. I may not have a complete understanding of what is going on but I can not make sence of what you are doing.:cheers:

 

[jmartin915]

I haven't replaced anything except for parts I know were bad (I damaged a few things on my way in). I already to the bottom end of the motor apart but did not remove the crank shaft. Just enough to gain access to view the brass gear on the rotary shaft.

 

[robin savell lloyd]

I some times misread a post and give bad info. I believe that this may have hapened to you and you have went way past the point you should of. Was your brass gear striped or not? If not start from the begining and lets see if all of us can help you out. you can pm any of us in a emergency. you can pm me anytime :cheers:

 

[jmartin915]

brass gear

The brass gear was fine. Seadoosnipe told me that he thought it was the seals if it was smoking quite a bit. In that case it would mean that it was getting too much fuel but...the fuel would not make its way through the seal on the r.v. shaft seal...the fuel only shoots in when the r.v. timing plate makes a revolution and would not go through the seal.

 

[robin savell lloyd]

If your engine was not hydrolocking after it set unused for the winter I would not think that it would be bad center crankshaft seals but I can allways be wrong. :cheers:

 

[jmartin915]

out of town...and waiting for parts

I am not going to mess with the thing tonight and will be out of town for a few days. In the mean time parts should be on the way (gen coil, lighting coil, and temp. sensor). When I get back I'll put everything back together and go from there. Everything inside the motor looks great so...it has to be elsewhere. Maybe start back tracking through the fuel system when I get back. Thanks for the help.

 

[kustomkarl]

jmartin, when you get back into the seadoo, let us know where you're at and we'll try to help you sort it out. It seems like you got a lot of information flying back and forth...my heads dizzy from reading all the confusing post!

Keep us posted.

Karl

 

[jmartin915]

when i get back

I will post a thread when I get back and have things back together. thanks for reading

 

[derek]

the RV shaft pops right out the side with a slide hammer or puller once you remove the retaining ring behind the valve itself. splitting the cases is not necessary. it is also cheaper to buy cases on ebay and get a whole RV shaft assy than to buy a new gear-sometimes. then you got 10 pounds of buck-a-pound aluminum.