98 seado gsx limited engine noise? Bearing?

[Zaine3847]

98 seado gsx ltd has 90 60 compression but will turn right over and run as long as you give it a little throttle but will die on water. The sound I'm getting sounds terrible i removed the pump and its not the wear ring if you have any ideas please help

 

[GGuillot]

98 seado gsx ltd has 90 60 compression but will turn right over and run as long as you give it a little throttle but will die on water. The sound I'm getting sounds terrible i removed the pump and its not the wear ring if you have any ideas please help

Needs a rebuild on the top end, if correct, that low compression is definitely an indicator. With that noise pull the head and have a look.

 

[Zaine3847]

Needs a rebuild on the top end, if correct, that low compression is definitely an indicator. With that noise pull the head and have a look.

I pulled the cover off and the valves took a look at the cylinder walls both sides look good. Rear cylinder piston looks erodeds around edges. That was the side with lower compression. The day before the seado started making this noise we sucked up a tow rope really good. Pulled it out and it ran fine for about an hour the next day then it started vibrating and sounding rough i could still drive it. The video i took is with the impeller off. You got any ideas of what to try next im not sure how to get the cylinders off while its in the engine. Are the valves supposed to have play in them or be tight?

 

[GGuillot]

I pulled the cover off and the valves took a look at the cylinder walls both sides look good. Rear cylinder piston looks erodeds around edges. That was the side with lower compression. The day before the seado started making this noise we sucked up a tow rope really good. Pulled it out and it ran fine for about an hour the next day then it started vibrating and sounding rough i could still drive it. The video i took is with the impeller off. You got any ideas of what to try next im not sure how to get the cylinders off while its in the engine. Are the valves supposed to have play in them or be tight?

Your compression should be closer to 130 per cylinder, instead of fighting it inside the hull, just pull the engine. At a minimum you need to go through that engine and do a top end rebuild.

Also, while you're at it, I'd rebuild the carbs to OEM, you don't want to spend money doing a top end and have a repeat of damage as you describe on the rear piston. Bad carbs are a known to trash a perfectly new top end.

 

[mikidymac]

The 951 is a highly stressed engine. Most of the time the crankshaft will not survive a top end rebuild.

You should replace the crank and rebuilt the balancer shaft when doing the top end.

With that low of compression and piston damage there is nothing you can do but a full rebuild. Make sure you remove the PTO before you pull the engine and start to take it apart.

 

[etemplet]

I got a 98 GTX Limited with 135/113.

 

[mikidymac]

I got a 98 GTX Limited with 135/113.

Full rebuild time. Sorry.

 

[Zaine3847]

Thanks for the replys anyone have any good websites to help a first timer rebuild a stroke. Also recommend me some kits to buy

 

[etemplet]

I would say "this site" is the best most consistent site for information, advice, and support. And whole lot less attitude.

 

[GGuillot]

Thanks for the replys anyone have any good websites to help a first timer rebuild a stroke. Also recommend me some kits to buy

Download a service manual, SeaDoo Manuals - FREE PDF Download! search on this site for info doing a rebuild and ask questions when you need to. Be patient, and budget for what you're doing, you'll need at least $1000 for what you're about to do.

Know your skills and motivation, doing it yourself can be the least expensive, but there are options to get engine core swaps done through places like SBT and there's vendors that do full rebuilds, you send them the engine, etc. Or, you can buy the components and do assembly yourself. I prefer the latter, with sending the cylinders out for the piston/bore machining fit. Purchase a crankshaft swap, then I order the gasket kit and follow the SM and so forth.