Other 650 Superjet Eng..a relic of the past ? paperweight? or more

[orangefinger]

I am still startled to why no one has come up with a different solution other than paperweight-or stealing the crank for these outdated but not out numbered 650 Superjet engines that everyone comes accross all the time ....

What are your ideas or improvements that could revive these low budget purchase engines and give them a new life with moderate investment... ? for all the not so fortunate friends of the sport which cant spend $ 3000-9000 on engines, ideas, suggestions or just rant... lets hear it

 

[crazy4sand]

honestly my 650 SN all it has is a pumpstuffer tall prop (unknown) full coffman exhaust jetted carb and milled 10ths on the head and shes a quick little b@stard beats my friends stock sxi pro it gets the job done for a backup / loaner ski

 

[98gti]

Great for a loaner/back up ski, super reliable. Has anyone really gone into one and really worked it? Probably not, it would be a waste, but just wondering.

 

[tor*p*do]

backup motor, waits for when needed

 

[yurkanip]

They are great little motors, My old 650 with high comp head and hooker 9/15 had great low end hook. Def, good backups so the riding season doesn't have to end early.

 

[Crab]

I am still startled to why no one has come up with a different solution other than paperweight-or stealing the crank for these outdated but not out numbered 650 Superjet engines that everyone comes accross all the time ....

What are your ideas or improvements that could revive these low budget purchase engines and give them a newi life with moderate investment... ? for all the not so fortunate friends of the sport which cant spend $ 3000-9000 on engines, ideas, suggestions or just rant... lets hear it

I'm looking for a runner myself!

 

[OCD Solutions]

I work with a guy who builds up custom golf carts with 2 stroke engines. I keep telling him about the old 650's and how cheap they are to pick up. He says he wants the next one I get my hands on. Just need to figure out a closed loop coolant system and they are some good cheap power that should run damn near forever.

 

[kevbo]

Provided its in good condition, the crank, carb, and electronics are very desireable. Cylinders and cases dont have much demand because there is plenty of inexpensive 701 parts around. At one time many people used 650 cases with 61X cylinders, they run about the same as 61X cases.

 

[River Rat]

I work with a guy who builds up custom golf carts with 2 stroke engines. I keep telling him about the old 650's and how cheap they are to pick up. He says he wants the next one I get my hands on. Just need to figure out a closed loop coolant system and they are some good cheap power that should run damn near forever.

what does he have planned if you dont mind me asking?

 

[OCD Solutions]

what does he have planned if you dont mind me asking?

Nothing specific at this point.

 

[SUPERJET-113]

I work with a guy who builds up custom golf carts with 2 stroke engines. I keep telling him about the old 650's and how cheap they are to pick up. He says he wants the next one I get my hands on. Just need to figure out a closed loop coolant system and they are some good cheap power that should run damn near forever.

Dude, that is what i have been thinking of building for years now, only maybe in a small, small car like the ones they build the electric homemade cars out of. Or maybe a small sand rail or something similar. Out here we can build and license anything. You should see some of the Mad Max mobiles running around.

I won Amateur Freestyle in IJSBA regions 4/9 in 2000,2001,2002 on a square nose w/ 650 6m6 cases, dual Pro-tec SBN 38's, with a 736cc 61X Pro-tec ported top end w/ B pipe, MSD enhancer, 24/7 foot holds, homemade hood liner. Basically a LTD square.

You can make 650 case work well, if you have a bigger 61X/62T top end. Like Kevbo says, the intake size difference is not much at all.

 

[yldsix]

I'm building mine now. Just got protec ported cylinder and pistons for $100, but I'm going to do my own porting on another cylinder a bit more radical but use the protec for a reference, some case porting also, will have total loss and b pipe. This is all going in my mod sn hull so we will see what happens. At worst I can get another cylinder and convert to 701 and I've only lost $100. The 650 is not that bad but if you got the money for 701 cylinder then better to go down this route.

 

[h2odesperado]

I'm glad this thread popped up. I got a random fairly heavily ported 650 top end with a square I picked up and after melting down a piston in my 701 I swapped it in. Mid range is sweeeet but nothing happens till about 3k. I'm running the same 46 and jetting I had on my 701 and I'm figuring the jetting is waaay off.

Sorry to threadjack but it is somewhat pertinent; any ideas of a jetting ballpark I can start with? Runnin just a b pipe and single 46.

 

[Vumad]

I work with a guy who builds up custom golf carts with 2 stroke engines. I keep telling him about the old 650's and how cheap they are to pick up. He says he wants the next one I get my hands on. Just need to figure out a closed loop coolant system and they are some good cheap power that should run damn near forever.

When you figure out how to make it run with no water going into the exhaust, give me a pm.

 

[mthomps]

I love my 650 motor. It is a an amazingly reliable work horse engine for me. It starts with a button click every single time. It's ingested more water than a fratboy drinks beer and it just keeps running and running.

I don't think my 20+ year old motor has ever been rebuilt. The pistons are scarred bad but she just doesn't give a f*** and just wants to run run run.

Most of the power is right off the bottom and that's fine by me. I spoke with Art at Jetworks about options in my budget and he told me the 650 sj motors are great for low end and I'd say thats accurate.

I may just build up my 650 motor instead of buying a 701. Reliability is the most important thing to me. I have a blast in the waves on my stock 650 driveline superjet and buddies have told me it's a super fun boat.

So to sum up I'd say 650 engines are a legit motor for guys who crave riding without resources to build big. I'm a newer rider and I can say I have plenty to learn with "just a 650"

 

[mthomps]

What are your ideas or improvements that could revive these low budget purchase engines and give them a new life with moderate investment... ? for all the not so fortunate friends of the sport which cant spend $ 3000-9000 on engines, ideas, suggestions or just rant... lets hear it

Art told me he could mill my stock head, port the cylinder, and pipe and prop me and the 650 can give a beat down to a piped 701. He told me he's made 650 superjets run 48 mph. I'm about 90% sure I'm going to ask him to do this for me. The cost of machine work would be 440 dollars plus the pipe and prop.

Like I said, reliability is the most important thing to me because..well..what's the point if it's just going to break a lot? There is no way in hell I'm going to be able to afford to build up a big 701 based motor any time soon. I am LUCKY AS HELL to just own a superjet. Lake erie is like a mini ocean this time of year, as many have witnessed this week. When it's flat there are plenty of boats to chase down. I'm not flatwater flipping any time soon and have such a blast shredding our chop with the guys that I really think a nicely built 650 is potentially all you need in my situation, at least for me.

 

[OCD Solutions]

When you figure out how to make it run with no water going into the exhaust, give me a pm.

Why would you keep the factory exhaust system? Adapt a dry pipe from something else like a snowmobile and unlock the HP.

An 800cc snowmobile engine makes a ton more HP than a 950cc watercraft engine (165hp to 130hp actually). I was always told it was the limitation of trying to stuff it all into a hull and keep the temps down. Remove that restriction and you should have a ton more options.

 

[Vumad]

Why would you keep the factory exhaust system? Adapt a dry pipe from something else like a snowmobile and unlock the HP.

An 800cc snowmobile engine makes a ton more HP than a 950cc watercraft engine (165hp to 130hp actually). I was always told it was the limitation of trying to stuff it all into a hull and keep the temps down. Remove that restriction and you should have a ton more options.

I don't know anything about snow mobiles, or exhaust tuning. I pretty much know I can buy a pipe to fit something and tune from there.

That's why I'm taking classes to work towards engineering. I want to move from mechanic to something more.

 

[SUPERJET-113]

When you figure out how to make it run with no water going into the exhaust, give me a pm.

Dry pipe with closed loop cooling, using a small radiator w/fan and water pump. Would that work?

 

[sixfifty]

sounds like it should. Thats pretty much a dirtbike engine then???