-
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
Top end boring?
- Thread starter pags1220
- Start date
- Status
pags1220
New Member
Well I got the head off and what do you know. Looks like snagged rings from the rave valve. There all chewed up. Put very minimal dimples on the head. The bottom end looks pretty good. But I'm going to rebuild the top end. So what do you guys suggest. How much should I bore it over. And how much power gain should I expect from it. I may as well add some other upgrades at this point lol
Sent from my SM-G900V using Tapatalk
Sent from my SM-G900V using Tapatalk
Stock is 82mm
Next is 82.25 with oem
Then 82.25--82.5--82.75--83mm if you go with wsm.
Id go absolute minimal boring.
So if they measure out to be 82.0 to 82.15, you migh get away with the 82.25.
82.5 is what I personally use if I have to bore but ive needed it in each case. Each time ive used the wsm kits with all gaskets needed included.
Get a measurement of your bores first and then decide
Next is 82.25 with oem
Then 82.25--82.5--82.75--83mm if you go with wsm.
Id go absolute minimal boring.
So if they measure out to be 82.0 to 82.15, you migh get away with the 82.25.
82.5 is what I personally use if I have to bore but ive needed it in each case. Each time ive used the wsm kits with all gaskets needed included.
Get a measurement of your bores first and then decide
Last edited by a moderator:
pags1220
New Member
The previous owner said it was a complete rebuild. I'm not sure how many actual hours are on it. Every gasket looks to be brand new and pretty much every bolts been molested. The whole motor in general looks pretty clean for the year so I wouldn't be surprised if it was rebuilt. Maybe they just made a simple mistake and didn't shave down the rave valves.
Sent from my SM-G900V using Tapatalk
Sent from my SM-G900V using Tapatalk
Hate to be the bearer of bad new bro, but those jugs are already 1.00mm over. Next size it 1.5, if it were me I would not be going there. Either hunt down a set of jugs to get bored or send the engine in and swap it for a reman and let them worry about re-sleeving it.
Look at the lower side of the piston (@ 7:00) and you'll see the 1.00 stamped on the piston.
Look at the lower side of the piston (@ 7:00) and you'll see the 1.00 stamped on the piston.
pags1220
New Member
Gahhh. Damn it. Well I just seen a set of jugs with everything on ebay with wsm pistons and everything you need for a top end. So I guess it's a true complete kit. 289 after a 150 core exchange. I guess that's my only option at this point.
Sent from my SM-G900V using Tapatalk
Sent from my SM-G900V using Tapatalk
Rave valves on a 657? Are you sure you've got the stock engine in that ski? In either case I would suggest taking the easy way out, since this is not the first rebuild, get a rebuilt short block.
Lou
I saw that kit from JJ Machinery, zoom in on those jugs. They look pretty gnarly in the jackets. Now, that might just be a stock pic the guy too, so ASK questions before you punch the Buy it now button. Ask what size over they are. Hate to see you get another 1.00mm over right off the bat.
pags1220
New Member
Yea it is a new ski. I had so much fun on the first I decided to get another. Plus I enjoy working on these things. It's fun and relaxing. I will absolutely question it. A few of them state there .05 mm over. Even if it's not a qualifying core. The cost of new jugs plus the bore will still end up costing more. Sorry I forgot to add the new ski in my list guys. Even with some knowledge I'm still a newbie lll
Sent from my SM-G900V using Tapatalk
Sent from my SM-G900V using Tapatalk
Just spend your money wisely. If you're at $550 to $600 for a top end and a complete reman is only $200 to $250 more, your best bet would be to step in that direction. Just don't over extend...... Hate to see you drop a top end on only to throw a rod cause some metal fragments scattered into the bottom end.
For instance: a standard (1 year warranty) 787 from SBT is $845 plus I think $130 shipping (includes return shipping) and another $32.95 for a installation gasket set. So your at a grand, but your all new including the rave valves and housings and bellows. I would also recommend at a minimum cleaning the carbs, but would more than likely just completely rebuild them. I know it's more than double, but like I said I'd hate to see you drop $439 run the summer and have it let loose again. I know you're not going to take it easy on it, the 787 is just too fun to not be on the gas. Just shop around and be wise.
http://www.shopsbt.com/seadoo-jet-s...engine-787-800-xp-gsx-gtx-spx-challenger.html
http://www.shopsbt.com/seadoo-jet-s...-install-gasket-kit-xp-gsx-gtx-xp-spx-xp.html
http://www.shopsbt.com/seadoo-jet-s...engine-787-800-xp-gsx-gtx-spx-challenger.html
http://www.shopsbt.com/seadoo-jet-s...-install-gasket-kit-xp-gsx-gtx-xp-spx-xp.html
Last edited by a moderator:
pags1220
New Member
Yea that's way over double lol kind of out of my price range for now. Is there a way to inspect the inside a bit more to see if there's any shavings? It looks like the Pistons got torn up to a minimum. But you are right it's always better safe then sorry. There's still a lot that I have to do to the ski and don't want to end up paying 3k for a 1997 lol
Sent from my SM-G900V using Tapatalk
Sent from my SM-G900V using Tapatalk
I hear you that you don't want 3K into a 97, but it will last you for years. I'm probably the worst guy to give you advice on which way to go. I dump new parts into my stuff at once, but I want to ride headache free and not wonder then the hammer is going to drop. There are procedures in the service manual to check the crank against, the cases don't look nasty inside so you might be OK. Somedays you gotta roll the dice, I'm not too much of a gambler.
- Status
