first superjet (sn 650)

well i just picked up a 91 square 650 superjet, this is my first standup, its completely stock and untouched. i think I'm going to take this summer to learn how to ride then put some money into it during the winter. i plan on painting it, new turf and some upgrades. I've read that a new prop, intake grate are the best things to do first, i don't plan on doing crazy tricks on it, just something to mess around on the lake with. a little about me I'm 6' 2" 225 athletic so I'm sure ill have no problems with it. anyone have any suggestions for parts that would be beneficial for me. in in Delaware Thanks
 

Midlake Crisis

Site Supporter
Location
Bakersfield, CA
Congratulations! Perfect ski to start on. If it is reliable I suggest leaving it stock and riding the heck out of it for a year, just enjoy gettig comfortable turning at higher speeds, basic bunny hops and sliding around, enjoy.
My 2 cents is that a stock 650 SN is more valuable as a learner/friend/backup ski than it is as a platform for modifications. Mods are expensive for what you get. If you love jet skiing after a year (and I think you will if your ski is reliable and you get out and ride) just buy another ski that rides like you want it to and keep the 650 as a backup. You will save a lot of time and regrets, and even money in the long run.
 

#39

Location
Australia
That's what they say, but they definitely feel different to ride. The higher handle pole mount point gives the handle pole more leverage from side to side and makes the round nose tip easier. That's why they started making and selling lowered pole brackets for the round nose. The square nose definitely feels more stable in choppy race conditions. I also have a slightly different riding style to most as I prefer to keep the ski relatively flat and not lean over too much. If I had to race a superjet today, I'd buy an old square nose again.
 

#39

Location
Australia
Shorter pole also isn't as crucial on a sn. Especially if the guy is tall at 6'2. The biggest issue with an old 650 sn is that they are quite low on power.
Learn to ride, do the basic handling mods like scoop grate, ride plate, prop, handle bars. Make sure the pump housing/ring is good and the drive shaft splines.
Start saving for a decent twin carb 62T engine.
 

bored&stroked

Urban redneck
Location
AZ
Personally, I'd ride it as is with just a bilge nozzle mod to the 93 or 94+ style, and keep an eye out for cheap performance. You can score 61x motors and protec pipe pretty cheap as everyone wants 62t and B-pipe.
 
We have a stone stock 650 in our group, we call it the electric ski because it pulls so smooth. They don't have a ton of power but they pull great off the bottom so they're nice for learning on.

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smoofers

Rockin' the SQUARE!!!!
Site Supporter
Location
Granbury, TX
First thing I would recommend is the quick steer mod. You drill a hole closer to the nozzle on the arm that the steering ball attaches to and then relocate the ball to the new hole. It quickens up your steering and makes the boat turn like it should. A search or two should turn up info on how to do it.
 
thanks all for the replies, I'm definitely pumped to finally get onto a stand up. I'm definitely going to check on craigslist for cheap upgrades. quick question whats a good prop pitch ( i guess thats what its called) some guy on craigslist near me has a skat track for sale for $99 and a protec plate for 65
 
quick question, i know the premix is 50:1 what oil do i use? does the yamalube 2w whatever (forget what it exactly is) i run it in my 05 gp1300r. does that work or what should i run?
 
quick question, i know the premix is 50:1 what oil do i use? does the yamalube 2w whatever (forget what it exactly is) i run it in my 05 gp1300r. does that work or what should i run?
I use Yamalube and mix it to 42:1 even though they recommend 50:1. I'd rather run a little rich to be on the safe side.
 
Nice! I just bought one of these as well. Same graphics.

I'm just using Walmart supertech synthetic for premix. I'm a new though. But I don't really think the brand of oil is all that important.

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thanks for all the info fellas but i now have a problem. so i took it out today and it runs fine under low rpms, has decent power. but when i try to get on the throttle more to stand up, you can hear the engine rpms pick up but it won't really move any more then it does under low rpms. is this a problem with the prop? or what should i look at
 
Sounds like cavitation. #1, make sure the pump intake is clear.

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