Budget SN Superjet build

Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Someone's a little 650 biased. A freshly rebuilt 650 with a rebuilt crank would be pretty reliable, but a stock 701 is plenty reliable too, but buying a used engine, you never know the condition of the crank unless you take it apart. I've seen used 701 shortblocks pop up in the 350$ range. Rebuild a stock 650- 250$ for a rebuilt sbt crank, 150$+ for the piston kits, 75$+ for the gaskets and even more for OEM crank seals, 100$ for the cylinder boring, etc. Not cheap. You could find a used 701 and replace the crank with a rebuilt sbt one for that. Also, you won't get much for selling a 650. They're not desirable motors. If you're already planning on going through rebuilding a 650, I'd skip that and go to a 701. But if you're 650 was running fine, I wouldn't tell you to drop a 701 in it right away if you were on a budget. Prop & an intake grate first, etc.
A 61x cdi can be found for around 40$, and will be perfectly fine with a stock 701 engine. You don't need a ton of extra revs on a stock 701. A lot of people run a piped 701 with just a stock cdi.. The 701 is a better platform to build off of compared to a 650. Whatever you decide to do, if you choose the 650 or a 701, throw a prop on it. A prop will make a huuuuuuge difference and power increase.
If you want reliable, don't mill the head. If you bump compression, put on a girdled head and make sure you run the right octane fuel.
 
paczowski123

paczowski123

Location
Forsyth County, GA
mthomps said:
There is nothing to read. But they break.

650's do to but they are so damn tame it takes a lot longer....someone might have one that runs like poop but there is probably something else wrong if you cant go out and have some fun on it....and the guys that say its a total dog have stock props...lol

From a guy on a budget who wants his ski to start everytime and go out freeriding if you yourself are on a budget and already have a 650 and you want to make your superjet run again it's as close to free as it gets baby. Reliable, fun, and most importantly dirt cheap.
Click to expand...

I'm not totally sure the OP is looking for "dirt cheap", as much as best bang for the buck..IMO, a 701 is the only option, room for growth as he goes, complete long blocks can be had for a few hundred dollars, and parts are more bountiful. Since the OP has not mentioned exactly what type of budget he's on it's hard to tell. But, with the difference between 650 motors and 701 motors being so little, the 701 seems like the right choice...I've never heard anything about a 701 being less reliable than a 650 either....Maybe the OP can chime on here and give us an idea of what his budget is exactly???
 
mthomps

mthomps

Location
Cleveland
When someone says budget build and they have a 175 dollar 650 the first thing I do is factor in cost of actually riding. I am not biased at all towards the smaller motor it's just a lot more than bolting the bigger one down to make it worth it.


Maybe my assumptions are just too conservative and the op has a couple grand to blow on a build? (something will come up when swapping an engine, pipe and cdi, it happens constantly in threads.) But to me the situation seems out of scope of building piped up 701 driveline here.

Let's not forget the footholds and the turf and all the junkthat's going to eventually come up.

"Buy 701 and pipe and 9/15 hooker prop" is all over this site so I don't see a thread being made if that were an option.
 
mthomps

mthomps

Location
Cleveland
Here are two options op:

1.

Buy this: http://www.ebay.com/itm/Yamaha-650-..._Watercraft_Parts&hash=item2a30860a1c&vxp=mtr

Yank the flywheel and stator from your old motor to use and bolt up your old carb.

Buy this prop: http://www.x-h2o.com/index.php?threads/144-solas-concord-13-17.145743/

OR.

2. http://www.ebay.com/itm/1994-Yamaha..._Watercraft_Parts&hash=item3cdc299536&vxp=mtr

You'll need to find a 61x intake manifold and rejet your carb. Your 6m6 flywheel/stator will work. You'll have to get a 61x cdi. You'll need a flywheel cover. You will probably need to rebuild the top end of it in a season or two. Buy the same prop as option one. Here is a 61x exhaust manifold so your ports match up properly. http://www.ebay.com/itm/Yamaha-701-..._Watercraft_Parts&hash=item1c38e928c4&vxp=mtr


...I guess there is not that much more to just going with the bigger engine. It will cost a bit more and have some more work than another 650 engine. Someone else mentioned knowing the actual budget is important.
 
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socal750

socal750

Socal750
Location
beaumont CA
I picked up a waverunner gp for $100 off of Craigslist...701 drop in ready sold the empty hull for the $100 then slapped on a Coffman sizzler, the ski rips.. But by far the biggest performance gain was doing the prop/cone totally woke the ski up... It's a superjet so the sky is the limit as far as budget goes... Good luck buddy

This is on my 91 square nose sorry had to do a quick edit
Sent from my iPhone using Tapatalk
 
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