Tag Archives: PWC

750SX – Completed and a lot of fun

I ended up having to order and of course wait yet another week on that woodruff key. In case you missed it review my last entry regarding this project. After I got that everything else was smooth sailing There actually wasn’t a single snag in reassembly. Here are the reassembled pictures:

12-Sep-2015 04:04, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.033 sec, ISO 250
12-Sep-2015 04:04, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.033 sec, ISO 200
12-Sep-2015 04:04, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.033 sec, ISO 400
 
12-Sep-2015 04:04, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.033 sec, ISO 320
12-Sep-2015 04:04, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.125 sec, ISO 400
12-Sep-2015 04:03, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.167 sec, ISO 400
 

The only problem was once I got it all back together it wouldn’t start. Excited, I set up the camera to record the first start after the tear down, all that video ended up netting was about 60 seconds of engine cranking.

A bit discouraged I check all the obvious things – spark, fuel to the carburetor, nothing obvious. I gave it a shot of WD-40 and that didn’t do the trick. After a lot of angst I finally got it to light off with just a tiny snort of premix, and it ran great. Of course I wasn’t videoing that round, but whatever. I did get video of the 2nd startup:

In addition between the last post and the current one Dad came to Minnesota and bought the family a present:

So with Debra and the new Yamaha in tow, we went to the lake the next day. I had full faith in my capabilities, but I am afterall getting fat so I figured better safe than sorry. I sent Debra out to float around on the Yamaha while I got ready and went out on the stand up. After tossing it in the lake I pulled the hood to make sure I didn’t introduce any massive hull leaks during the project, since I didn’t I went to fire it off. Crank crank crank crank crank… seriously? I waved Debra in since I didn’t have adequate tools with me to get gas down the carb horn. We went home and I did a bit of research. It would appear that the Kawasakis are a bit notorious for hard starting and I shouldn’t waste time trying to “fix” it but rather just put on a primer. So that’s what I did.

12-Sep-2015 11:15, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.033 sec, ISO 160
12-Sep-2015 11:15, Panasonic DMC-ZS7, 3.3, 4.1mm, 0.025 sec, ISO 125
 

The primer solves the issue 100%. I have to give it a couple snorts at the beginning of each day then it starts and runs like a top for the remainder of the day – very SkiDoo like. So we went back out.

Debra went out floating on the couch again and I had better luck leaving shore this time. I floated around a bit, trying to remember how to run the stand-up, not that I ever knew how in the first place. Things went well, the ski ran well and I was happy. We meandered our way back to shore, that day wasn’t meant for playing.

Here a couple of weeks (and 1 AC/DC concert) later I went back out today. I spent probably 40 minutes aboard the ski and burned a good 3-4 gallons of gas. It’s a ton of fun, running great and this project is a wrap. I’m not sure where I stand on the remaining annoyances of the ski, those being the minor hull problems, the crank bearings that are no doubt in need of replacement, and the borderline compression. I truly do have other things to worry about in my life – we’ll see how eager I get over the winter to get back on it and judge then. For now, it’s in the books.

Day 1 as a PWC owner/mechanic

Admittedly, I’ve “owned” the thing for about a week now, today was my first opportunity to dip it in the lake and see if it a) floated, b) ran. It did both, but the latter it did very poorly. It was sold to me under the auspices that the stator needed to be replaced. It didn’t take me long to negate that as the case, or at least that’s not the big problem. Starts and idles on 1 cylinder, second comes in with a bit of RPMs. Crank seal all the way baby.

I bought a leakdown tester and rigged up some plugs for the intake and exhaust. I learned today that not all 2 cylinder 2 strokes have a center seal(s). How that actually works, I don’t know – but I sealed off 1 side expecting I’d be able (prefer) to do the leakdown 1 cylinder at a time and was greeted with air coming out the other cylinders intake ports. WTF? It can’t be a center seal problem because only 1 cylinder is messed up. I came to the computer and googled and saw no existence whatsoever of a center seal on this thing. Like I said – how that works I don’t know. Poorly I’d guess, but whatever. I’m not about to go re-engineering Kawasaki’s Crankshaft and Crankcase that they sold 1 bajillion of.

I took the engine out, plugged both exhaust and intake ports up as well as I could; not as good as I did with just the 1 cylinder, but I was defeated at this point. Realistically it didn’t matter anyway, I was seeking to prove to myself something I was already 99% confident of. Sealed up pretty well, back on the air, the following YouTube video clearly shows it likes blowing bubbles just like a 4 year old by with a bottle of that soapy crap and the ring:

Other mentionables, with the engine out the grime in the hull cleans away pretty easy. I think with about an hour of Comet, water and a bit of elbow grease it will look almost presentable inside.

Compression is 120 on the PTO side and 130 on the Mag side. Not sure if that’s good bad or other, but it’s going to be what it is for now. So far I’ve found the thing super easy to work on and I’d like to keep it that way as much as I can. I’m going to split off the bottom to replace the seal and hope to go no deeper than that before shoveling it all back together.

Lastly, there is one picture where you’ll go WTF am I looking at. It’s a snapshot looking into the spark plug adapter for my leakdown tester, and what you see is uncleaned metal shavings. Way to go cheap tool company, couldn’t think of a better thing to drop down into my cylinder!!!

That’s it for day 1.

01-Aug-2015 18:26, Motorola XT1060, 2.4, 4.499mm, 0.017 sec, ISO 400
01-Aug-2015 18:00, Motorola XT1060, 2.4, 4.499mm, 0.017 sec, ISO 250
01-Aug-2015 18:00, Motorola XT1060, 2.4, 4.499mm, 0.009 sec, ISO 320
 
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.009 sec, ISO 400
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.003 sec, ISO 160
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.003 sec, ISO 160
 
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.002 sec, ISO 160
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.002 sec, ISO 160
01-Aug-2015 17:58, Motorola XT1060, 2.4, 4.499mm, 0.002 sec, ISO 160
 
01-Aug-2015 16:26, Motorola XT1060, 2.4, 4.499mm, 0.005 sec, ISO 160