• This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.

Building a motor

Status
Not open for further replies.

WrensLawnCare

New Member
Ok so I am gathering up parts to put a motor back together. I have NEVER rebuilt a motor like this before or even worked on one. I have worked on ATV engines and stuff before and work on vehicles all the time so I do have some mechanical skills.

Particular motor is a 787 for a 97 XP.

I believe I have most of what I need but its all the odd ball stuff I need to get.

I need the bolts for the cases. P/N 420240328

Quite frankly I don't want to spend $11.24 or even 8.50 per bolt....seems a bit steep IMO.

If anyone has any other places to get them cheaper I would greatly appreciate it!
 
That is the problem I am having. If the manual stated exactly what all of the bolts were I could do that but like I said. I don't want to buy all these bolts new at 8.50-11.50 a pop. I would end up having 2-300 just in bolts!
 
Put those babies in the vise one at a time while you take a wire wheel on a drill to it. Then assemble with marine grease and Presto! Send Matt Braley the old weird aftermarket head that you don't use and your done.:hat:
 
I don't really have any of the old bolts as I brought everything home in about 5 boxes. I will be getting rid of the twist head and maybe the stock head. Not sure yet. I will be using the FRM racing head. It will require pump gas but oh well. I am use to our ultra 250x that can suck up 20gallons in the matter of an hour or two.

I do have two cranks and two balance shafts. One crank is bad but will probably sell to someone that needs a core. And will sell the other balance shaft also along with all the other parts I have in the cabinet.
 
Ole Spimothy was just looking for a head as well. Someone can get you the used hardware real reasonable. You should look ahead to see what else used you might need because a guy like Minnatonka4me can put it all in the same box for you.
 
Yeah I am going through the shop manual now looking for everything I need. I have a cart of about $600 on SBT for a top end kit with new cylinders pistons and all that good stuff along with some other things.

I am talking with both members now about the head and the parts I need. Some stuff I want new. Stuff liked bolts I don't mind being used.
 
Yeah I am going through the shop manual now looking for everything I need. I have a cart of about $600 on SBT for a top end kit with new cylinders pistons and all that good stuff along with some other things.

I am talking with both members now about the head and the parts I need. Some stuff I want new. Stuff liked bolts I don't mind being used.

fullboreonline has kit starting at 300 bucks.
Send your cylinders in. He bores them and sends it them back with new pistons and gaskets for install.
 
fullboreonline has kit starting at 300 bucks.
Send your cylinders in. He bores them and sends it them back with new pistons and gaskets for install.

Problem is my heads have all of the studs broke off in them. They were like that when I got them. I figured by the time I pay for labor to get 16 studs removed and replaced I would probably be cheaper to get new cylinders? Especially once i get them bored/honed and new pistons. Etc.
 
I have a few used sets of every bolt you need. Unfortuneately, I know where everyone goes just by looking at it. I'll sell a whole set for $40 + shipping, pm me or email me directly at ohiopowersports@woh.rr.com. built a 787 yesterday and will build another on Friday, and another next week. Pretty sure if you just handed me a bolt while I was blindfolded I would know exactly where it goes which is quite sad.
 
I have a few used sets of every bolt you need. Unfortuneately, I know where everyone goes just by looking at it. I'll sell a whole set for $40 + shipping, pm me or email me directly at ohiopowersports@woh.rr.com. built a 787 yesterday and will build another on Friday, and another next week. Pretty sure if you just handed me a bolt while I was blindfolded I would know exactly where it goes which is quite sad.

thats a pretty good offer, especially if its a complete bolt set. i was wondering if I can put a set together, but all my seadoo misc bolts are kind of in a big huge plastic bucket. I was going to suggest ebay since people sell bags of misc bolts from a tear down and it will probably have 98% of what you need, the other 2% can be located then, and those run about $40ish + shipping, if i was you, i'd take up that offer.. :)

but I have a set of clean head bolts that i literally pulled out of a 787 last night, bagged them up for reuse but its only head bolts not a complete case/head set.

that twist head is a bit of an enigma, it has an odd cooling setup, two inlet's no outlet might be a tricky one to work with.

if your cyl's are bad, i'd just say find somebody with a set of borable's cheap and two will fit in a medium flat rate, and have those bored instead of bothering with broken bolts, etc. there are a bunch of guys (myself included) that have a dozen borable's that are sitting around.
preferrably i'd suggest a set that can be bored to .5 so you still have some room if you ever need to bore again. the actual bore should only cost about $100 at a good shop, you just drop off the pistons, give them your clearance, (.006 to .0065) and 3 days later you're ready.

in a perfect world, you will blast the cases, cyl's head, and paint when complete. I do NOT recommend putting the cases together until they are super clean, they should be blasted, cleaned, scrubbed, cleaned, and rinsed multiple times to get them as clean as possible, you don't want a little speck of anything in there when you begin assembly, 100% clean !!!!

if you don't have a blast cabinet and can't locate a buddy with one, and don't wanna buy one for just this, then find a local place that does powder coating, they usually do blast services stand alone pretty dam cheap, i've dropped stuff off before when I was too busy/lazy to blast a few pieces clean and $40 goes a long way for blasting only. I'd blast the cases, cyl's head, PTO motor mount bracket, and the exhaust (all 3 pieces) to prep for paint, I prefer the hammer finish for the engine paint (wally world $6 )
 
Last edited by a moderator:
Where did you see the two inlets? I'd has to look at it again to be honest. I'm still all new to this so bear with me

the 6 bolts for each cyl are in a round pattern, 12 total, the two inlets are the two that don't fit that "circle" pattern.

a pic is below, the red circles are a little faint but you should be able to see them :) but there's no outlet !!! apparantly it drains out below, its a weird one !

1.jpg
 
Gotcha! Yeah I'm still unsure on what I do for cylinders!! I could buy used cylinders and get them done like you said. I have no problem doing that. I'd love to find a set I could use standard bore pistons in. Just because I have a brand new set in the cabinet.

I plan to have the cases either blasted or acid dipped and then I will paint them right after to prevent from any rust forming. I want to make sure I have everything I need to at least get the cases together before I start anything.
 
Gotcha! Yeah I'm still unsure on what I do for cylinders!! I could buy used cylinders and get them done like you said. I have no problem doing that. I'd love to find a set I could use standard bore pistons in. Just because I have a brand new set in the cabinet.

I plan to have the cases either blasted or acid dipped and then I will paint them right after to prevent from any rust forming. I want to make sure I have everything I need to at least get the cases together before I start anything.

well the good news is that the 787 ran individual cyl's so many times one goes bad the other is still good (quick hone) so whoever disassembled the engine might just save the good stock cyl, and bore out the bad cyl along with another bad one in stock. The bad news is that so many ppl run 787's that those have been picked over to the point that a good std cyl becomes pricey and makes boring out a set more practical. The problem you'll have is the clearance's a light hone a heavy hone a real heavy hone and your clearance become unacceptable :(

the fact that you have a set of std pistons might make that search worthwhile, i might just suggest that you sell them and use that money towards a larger set, but if you decide to keep them, that saves you $120i+ and helps you avoid having to order double gaskets, many times you order a top end kit it comes with a top end gasket set, and then you say, oh crap i need a bottom end gasket set and you end up ordering a complete set and you are buying two gasket sets.

bottom line, buying two stock std bore good quality cyl's will probably cost less than $200-260 (thats a guess" but you'd have to count on the seller giving you exactly what you need, not something that has been honed to the point that it will be too loose.

or you can buy two std borables, order a piston set at .5, (sell your std pistons and take a small loss in the exchange) and take the pistons & cyl's (cleaned) to a shop for a bore and then you'll know your clearances are correct.

if your planning on getting cases & head blasted by a 3rd party, then wait until you decide on cy's, get everything done at the same time, before boring unless they end up being spotless/paintable upon delivery. they will be fine after blasting you can let them sit for quite some time, no rust will form, no worries there. and get the pto/motor mount bracket blasted too, those things love to rust !

i think they acid dip if prepping for powdercoat, i don't think that would be necessary if you plan to just rattle can it.

when i talk about the clearances, that's a critical issue, its much easier to bore a cyl to match a piston than to get a piston to match a cyl, that is something that should not be overlooked.
 
Last edited by a moderator:
Status
Not open for further replies.
Back
Top