Project "Holeshot" - A "semi budget" 1990 650sx

"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
I posted about this ski last year, but after the 2023 season, I think I want to make some updates to show my process from a 2700 dollar 35 mph S***box I got for 2,700 CAD to what it is now, a 49 mph Ripper probably closer to 7-9,000 CAD Ripper and finally a 50+ MPH Monster that I probably should have stopped spending money on and switched to a Rickter. I'm going to copy-paste the posts I had on it over here and slam in as much detail as I can remember.
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
I posted about this ski last year, but after the 2023 season, I think I want to make some updates to show my process from a 2700 dollar 35 mph S***box I got for 2,700 CAD to what it is now, a 49 mph Ripper probably closer to 7-9,000 CAD Ripper and finally a 50+ MPH Monster that I probably should have stopped spending money on and switched to a Rickter. I'm going to copy-paste the posts I had on it over here and slam in as much detail as I can remember.

Cool following !
 

"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
*Disclaimer* - This was originally posted in September 2022

Hello All. In May of 2022, I got tired of staring at photos on my dad's garage wall of him and his boys riding their Superjets, Fx1s and 650s way back in the 90s, way before I was born. After a couple of months of restless searching and nagging from my dad that I shouldn't settle for a Kawasaki because they are unreliable, boring etc.... I bought a 1990 650sx for $2700 Canadian ($1966 American). A low enough price on what looked like a solid engine was enough to get my dad to cave in.

Riding the jetski was tough the first couple of times until I finally started to get the hang of it. A couple of nose dives and tail stands from my 200+ lbs dad told my 135lbs self at the time I had a long way to go. However, the Ski was running like a stocker, which confused me. It came with a Westcoast exhaust and manifold. A round Mikuni 44 and intake with Ocean Pro flame arrestor to match. I would later find out that what looked to be an aftermarket impeller was a 10/18 Skat. For most of The summer, I got out of my Ski at 53km/h. That was enough to keep me excited to run a standup with my dad, who admits his old body taps out on a Seadoo Spark Trixx (couch) these days. Still, I knew more to come from these 650s, so I wanted to mod the crap out of it to get the 80km speeds that one could only dream about getting out of a 650 motor.

Watching videos like these didn't help: 92 World Jetski Finals.

Once I lost my nose trim and gas cap during a submarine gone wrong In July, and I was prompted to look into more of the Ski. I had almost sunk It after only riding around for two months. We found the ignition coils had a bad connection to the boots, and on the summer's last ride, I was nearly doing barrel rolls and Rickter inverts on the Ski. In 5ft chop, I got the old girl up to 70km/h. Now, that was what I was talking about!!

The Ski is sitting completely torn apart in my garage for the winter, and I will rebuild the machine, mainly to keep me from going crazy. After talking with many other 650 guys, reading an endless amount of forums and watching about every video on YouTube I can find, I decided to Write down everything I'm doing to the machine so that maybe it could be helpful to anyone who stumbles across it.

All the Best!!

Hotshot Howie.
 

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"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
*Disclaimer* This was Originally posted in November 2022

So It all starts with the Sh***y part: Taking everything apart to see what I'm Dealing with. The Ski was painted in White and black Plasti dip. From the start, I knew that wouldn't last because Plasti dip gets destroyed in the waves. I put some stripes on the machine in two previous pictures, including Plasti. Once I got it in the garage, It took just a heat gun and some patience to peel the Plasti dip off. They came up in large pieces because the rubber base held them together for the most part. For all decals in general and Plasti dip, in my case, you NEED to resist the urge to sand it off. The layers between the sticker and the hull will sand simultaneously, creating lots of humps on the hull that you can see from a mile away when you do your paint.

After peeling the Plasti dip off, I tackled, taking out the trim pieces I had on the ski. The trim around the tray came off with no problem because it was screwed into the SMC directly. Given that I'm laying hydro turf down, I just used an impact drill to get them out with the plan that I will fill the holes with fibreglass putty once I get to. Bodywork. The trim pads on the hood were A.P.I.M.A. The best way I could describe to get them off is to lift the side frontmost with a pry bar and hammer it backwards until it breaks loose. I've heard that Kawasaki used the same glue that holds the two sides together to glue these pads down, along with a hook holding it In. I will peel the upholstery off the plastic pads and reinstall them with hydroturf. If not, I'll settle for selling them on eBay or elsewhere. The bumpers were the next ones to come off. I believe they were 10mm sockets, but some nuts were 11s because I bought the back bumper separately and screwed on what would fit for the summer. Some bolts had broken the glue, holding them tight inside the bumper, so I had to pry those out with the plan to glue them back in.

I used two 23-mill wrenches to separate the bolt and nut holding the handle pole to the bracket bolted to the hull. Everything I took photos of and separated in ziplock bags.
Two rubber bumpers were pretty beaten and held together by painter's tape. I will glue the rips together because they are still good parts and not worth the hassle. To separate the pole from the rest of the ski, I removed the start-stop switch from the electrical box after numerous photos. The throttle and steering cables came out easily after the start-stop was removed. The handle pole slid right off, and I stored the throttle cable and start-stop while keeping the steering cable in the hull because I had no ambition of pulling it through the bottom of the stern.

After unbolting the exhaust from the engine (West Coast exhaust is only split in half, not the top to bottom that the stock exhaust is), both came out with a bit of a headache. I stuffed rags down the carb and exhaust to stop debris from falling into the engine. All the electrical parts and the engine and exhaust were set on a rack for storage until I decided if I wanted to do anything to the motor.

The fuel tank lifted right after I drilled out the rivets on the filler neck hole. As you can see in the photos, It was pretty beat, and I plan on filling the hole over and drilling a new one out so I know it's solid. The driveshaft also slid right out as it wasn't pinned against the motor anymore.

The forums convinced me I needed the might of Zeus and several nuclear bombs to drop the pump out from under the tray. In reality, all it took was a PB blaster and 5 minutes of soak time. I broke one of the nozzle's bolts before discovering this dark magic in my dad's spray cabinet, but other than that, it came out with no problem.

That's about all I can think of. If anyone has any questions, I'm sure I forgot something.
Photos for teardown will come after I can lower the resolution on them.

See You when I'm done sanding and Bodywork!

Hotshot Howie.
 

"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
*Disclaimer* This is the first of the posts I am updating today. Yes, these are long. But I'm vain and love detail, so here we are :)

The bodywork on this ski was a process and a half, to say the least. After peeling back all of the plastic dips, the hull I was left with was left in a state of disrepair that reeks of Facebook marketplace flip job. That coincided with the one-cylinder nature of my ski until I fixed the pressure leak and dead first cylinder. The hull and minor stress cracks all over the ski and Identifying which could be top patched and which needed to be ground down and filled in was my priority. They were the worst right on the nose. around the handle pole bracket and along the corners of the hood. This story told me that this ski was a jumper, not a racer. So, to keep the hull alive, I ground out all the cracks worth repairing and filled them in with a fibreglass spot repair. The fuel neck was destroyed in my failed submarine, which probably killed the first cylinder and left me stranded for the August month of the 2022 season. I cut to shape a piece of stainless steel, used it to reinforce this region, and used the same spot-fix fibreglass putty to fill the entire area about a quarter inch thick. After this, I sanded the entire ski down to 400 grit for the base coat.

A knockout I had in front of easily 100 people at the marina I launched from taught me two things. One, wear a helmet ALWAYS, and two, footholds aren't just cool; they are a good idea. I cut out spots for some footholds and put them back in the tray, a bit too far back to be comfortable, but I want to pull the nose up when I use them anyway. They went in with a lot of fibreglass fill, and I drilled four holes on each side of the tray to fill in the excavated foam. *note* my ski does sit a bit further forward in the water because I took some weight out, but it's nothing severe enough to worry about.

After I sanded these to size, it was on to the paint, but I will keep that for another post to keep these themed. Here are some photos of what my ski looked like before primer.
 

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"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
The paintwork that I did on my ski was an extensive and meticulous process. Firstly, I covered all the cracks with fibreglass putty and sealed the footholds to ensure a smooth and even surface. Next, I sanded every inch of the ski down to a fine 120 grit, before applying plain automotive primer. I then proceeded to use automotive high-build white to lay several layers of primer, building up all the sections carefully.

To ensure that I hadn't missed any spots, I lightly sprayed black paint all over the hull. This helped me identify the areas that needed more sanding. After another week of sanding, I levelled the primer down to 400 grit on the top and sides of the hull and 200 grit on the bottom of the hull.

The next step was sourcing two special kinds of paint. For the bottom of the hull, I decided to give the 650 a superjet treatment by spraying a thick coat of white gel coat. I mixed this with acetone in my automotive paint gun to ensure that the paint would bond correctly with the hull's surface. After painting the gelcoat bottom, I taped it off and painted the jetski with a totally custom Kawasaki green colour that I had made for my ski.

It's been a year since I finished the build, and I've had a lot of people asking for the colour code to replicate the look. Unfortunately, I want my skin to remain one of a kind, so I'm unable to share the code. Nonetheless, I'm extremely happy with how the paintwork turned out, and it's been a great conversation starter when I'm out on the water. All in this paint job cost me more than I paid to get the ski, but since my riding is pretty awful, I'm going to be spending loads of tray time on this sweet ride.
 

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WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
I have to wonder why you sprayed Gelcoat on top of primer though, I would think that to be counterproductive.
 

"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
After completing the painting work, I found myself in a dilemma regarding my 650 jetski. I had bought it for a relatively low cost by Canadian standards, but then invested almost 6 thousand dollars in not only restoring it but also retrofitting it to keep up with my small fleet of Seadoo Sparks. I quickly realized that I was spending twice the money to get a ski that was good for racing, freestyling, and looked pretty cool. Now, I had to focus on realism a little bit more. To finish the ski's looks, I installed IPD 650sx Jetski graphics with a touch of pink to get the bright obnoxious colors of Havasu in the early 1990s while also looking stylistically modern. I decided to keep the OEM handlepole and reinstalled it with plans to try welding a stainless one later on. I purchased green hydroturf and an extra grey pad to make the ride a bot softer from vintage jetski in October and didn't receive an update or even my order until April of the following year which was quite discouraging. regardless I used tinfoil to help shape the turf in a way that would look flush with the footholds and I think that the whole picture tuned out quite good.
 

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"Holeshot"_Howie

CEO of Rickter money on a 650
Location
London ON
So here is realistically where I am. I live my ski and will likely never get rid of it. Because of that price is not an objection to me but I want to do as much as I can myself to A save in the short term and B enjoy making this ski run like it's off a dealer lot brand new

I want suggestions on how to reshape the hull for better race grip along with adding sponsons

I want to get my currently 80kmh engine (on radar) to run comfortably there and maybe touch the 90s

I want a trim setup for poops and giggles I'll never flatmates backflip but thar would help loads on a wake

Throw anything my way exept buy an Fx1 lol
 

Big Kahuna

Administrator
Location
Tuscaloosa, AL
Ride it the way it is and enjoy it. That ski will never back flip. Dont waste time on a trim setup. It will never handle as good as a 750 SXi Pro or SXR. But they are good hulls to rip up the lake and jump boat wakes..
 
Location
dfw
The 650sx is too slippery to turn flat and you have to slow down more to get it on an edge than you would on a 750. On a tight course or on the old slalom the 650 is a lot of fun. You have to lean first then turn the bars once its on an edge. Riding a Superjet you lead with the bars then it stays flatter. It really hurts my old Kawasaki turning skills. I never spent much time on a 550 so I can't compare it.
 

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
So here is realistically where I am. I live my ski and will likely never get rid of it. Because of that price is not an objection to me but I want to do as much as I can myself to A save in the short term and B enjoy making this ski run like it's off a dealer lot brand new

I want suggestions on how to reshape the hull for better race grip along with adding sponsons

I want to get my currently 80kmh engine (on radar) to run comfortably there and maybe touch the 90s

I want a trim setup for poops and giggles I'll never flatmates backflip but thar would help loads on a wake

Throw anything my way exept buy an Fx1 lol
The 650sx is too slippery to turn flat and you have to slow down more to get it on an edge than you would on a 750. On a tight course or on the old slalom the 650 is a lot of fun. You have to lean first then turn the bars once its on an edge. Riding a Superjet you lead with the bars then it stays flatter. It really hurts my old Kawasaki turning skills. I never spent much time on a 550 so I can't compare it.
Well as usual I will play devils advocate here , yes it can be done because I have done it , here are some pics and the mods I did to mine , it is defiantly not slippery and it turns on a dime , plus the ski is a lot more playful for just recreational riding.

I added tubbies , mostly because I have the molds and I can , I also shortened the ski at the rear to the second set of ride bolt holes , then I shortened the ride plate to match the new hull length , I also cut the rear corners of the bondline which lets water flow through on the corners like on an X2 instead of catching water at the corners.

Most here can surely tell you that you shouldn't or can't , I can speak from experience because I have actually done it.

Here is the link to the thread it's a rather long read : https://www.pwctoday.com/forum/gene...lds/98106-650sx-conversion-ski-fixed-steering
 

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WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
A couple more things I need to add , this ski is in a constant state of flux , I have new ideas , I implement them , I am considering doing a major ski redo that no one has ever seen before so stay tuned to that thread , I may consider posting it here as well..

If you are a 650SX nut such as myself you owe it to yourself to give this next thread a read , the guy is kind of a hack but in this instance the work he did on these two 650's is excellent.

 
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Location
dfw
All skis turn how they turn. You need to bring another ski to ride in order to find differences.
 
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