1999 SeaDoo GTX RFI Bad Piston Ring Question

[Sammoosings]

Hey Thanks Ahead of time,

I have a 99' Seadoo GTX RFI I just bought used. We ran it twice & lost engine power & got our local seadoo mechanice to look at the motor. He inspected the compression & one cylinder is good & the other lost compression. So he took off the head & the top ring on the bad cylinder was bad with some light scoring on the cylinder wall (thus the loss of compression). The mechanic said that the piston ring could have dropped into the bottom end & could cause damage, or got blown out in the exaust. I'm not sure if that will cause all that much of a problem. He gave me all types of scenarios. He recommended to replace the entire top end of the motor. I suggested to just replace the piston rings and buff out the cylinders & be done with it. He said that would work to but, he wanted me to know all options.

My question is, is replacing the piston rings a good fix for this or should I replace the entire top end of the motor, pistons, cylenders sleves, etc...?

Please give me some feedback... Thanks, SAM

 

[LouDoo]

Piston Ring

If it was my ski I would find the piece of pieces of the piston ring. If your mechanic can find the piece, I would just hone the cylinder and replace the rings.

If the pieces are not in the motor I wouldn't worry about it, I can't see where there would be a problem elsewhere.

Lou

 

[daverade]

yep yep...one of those bendy magnets, and a flashlight here...... then i would agree wit lou... to resleeve is a lil overkill unless the sleeve is real jacked up

 

[kennhis97gs]

replacing piston rings

Hey i was thinking of replacing my piston rings. How hard is this? do u have to completely remove the pistion from the connecting rod? I hate the idea of messing around with that and losing cageless rollers, dealing with the circlip etc.

 

[kennhis97gs]

Hey Thanks Ahead of time,

I have a 99' Seadoo GTX RFI I just bought used. We ran it twice & lost engine power & got our local seadoo mechanice to look at the motor. He inspected the compression & one cylinder is good & the other lost compression. So he took off the head & the top ring on the bad cylinder was bad with some light scoring on the cylinder wall (thus the loss of compression). The mechanic said that the piston ring could have dropped into the bottom end & could cause damage, or got blown out in the exaust. I'm not sure if that will cause all that much of a problem. He gave me all types of scenarios. He recommended to replace the entire top end of the motor. I suggested to just replace the piston rings and buff out the cylinders & be done with it. He said that would work to but, he wanted me to know all options.

My question is, is replacing the piston rings a good fix for this or should I replace the entire top end of the motor, pistons, cylenders sleves, etc...?

Please give me some feedback... Thanks, SAM

did he say what your compression dropped to in ur bad cylinder? just curious is all.

 

[daverade]

Hey i was thinking of replacing my piston rings. How hard is this? do u have to completely remove the pistion from the connecting rod? I hate the idea of messing around with that and losing cageless rollers, dealing with the circlip etc.

no...you just remove the pinger (piston) from the jug and pull off old rings and install new ones...then use a piston ring compressor (harbor freight $10) and slide them back in.... why do you just want to put new rings??? i would do a compression test first

 

[kennhis97gs]

no...you just remove the pinger (piston) from the jug and pull off old rings and install new ones...then use a piston ring compressor (harbor freight $10) and slide them back in.... why do you just want to put new rings??? i would do a compression test first

compression is 120 and 112 so starting to get low compression on the one cylinder, thought maybe i could get a little better numbers with new rings.

 

[kennhis97gs]

piston ring compressor

hey will this one do?

http://www.harborfreight.com/4-inch...hftusa&utm_medium=hftusa&utm_campaign=buylink

 

[daverade]

das what izzz talkin about...yup, you dont have a store nearby. they do keep them on the shelves-fes?

 

[kennhis97gs]

das what izzz talkin about...yup, you dont have a store nearby. they do keep them on the shelves-fes?

ya have to order it online...unless maybe i could get it at a store around here...in canada we have canadian tire they have almost anything you can think of so they might have one

 

[olds72]

Hey Thanks Ahead of time,

I have a 99' Seadoo GTX RFI I just bought used. We ran it twice & lost engine power & got our local seadoo mechanice to look at the motor. He inspected the compression & one cylinder is good & the other lost compression. So he took off the head & the top ring on the bad cylinder was bad with some light scoring on the cylinder wall (thus the loss of compression). The mechanic said that the piston ring could have dropped into the bottom end & could cause damage, or got blown out in the exaust. I'm not sure if that will cause all that much of a problem. He gave me all types of scenarios. He recommended to replace the entire top end of the motor. I suggested to just replace the piston rings and buff out the cylinders & be done with it. He said that would work to but, he wanted me to know all options.

My question is, is replacing the piston rings a good fix for this or should I replace the entire top end of the motor, pistons, cylenders sleves, etc...?

Please give me some feedback... Thanks, SAM

I would pull the cylinders and have them inspected at a machine shop. I also would not take any chances on screwing up the bottom end. A new crank is costly. Pull the engine and split the cases and inspect. Follow the advice of the machine shop. If it needs bored then have it done. I stuck about $700 rebuilding mine myself. I sent all my stuff to fullbore including rave valves. They also sell complete engines. I got everything back withing 7-10 days. I bought the pistons, rings and gasket set from them. It was under $400 including shipping. http://fullboreonline.com/