Super Jet Update: Superjet Wouldn't Run Past Idle, Now Won't Start

[zbomb88]

I took my 02 SJ w/ 701 out today and it would die whenever I opened the throttle. The most I was able to do was just touch the throttle lever and the ski felt like it was spitting and sputtering. If I tried to give it more gas it would die right out. I subbed the ski a little ways under water but I don't think it was running real good before that. The ski does not run with the hood off either. I had the starter fail on it last week so I had to tow it to the launch. I ended up with a lot of water in the hull while towing and I had did have the starter removed from the engine. I ran the bilge and left the plugs out afterwards. Could this potentially cause my issue? The only thing I have done since it was running perfectly was R&R my factory pipe head pipe and chamber and replace the starter. The hose clamps seemed to line up and tighten just fine. Spark seems ok, the plugs are proper color. Fires right up every time. Idle does seem pretty rough. Not quite sure where to go from here. Sell the thing and buy a Kawi? Sorry for rambling.

 

[zbomb88]

Could my coil potentially cause this? I am now at a complete loss on what to do.

 

[yamaha415]

Check to make sure both carbs are opening. Had a linkage rod losses up and only the front carb was opening when I hit the throttle

 

[Speleopower]

Mine was doing this a couple weeks ago. It started doing this after getting rolled by a wave. Ran fine then didn't run past idle. I thought maybe water in the gas but nope...no water.
When were your carbs fully rebuilt? Have you checked for an engine airleak?
I ended up pulling the engine out and fully rebuilding the carbs along with doing an air leak check. I think my problem was a worn carb pump clear plastic piece and anl air leak on the carb base gasket. My engine held 10psi for almost an hour when I let the pressure off.
Scott

 

[zbomb88]

I bought the ski about 1 1/2 years ago and have not touched the carbs (stock mikuni's) I will take them off/apart tonight and see if I find anything. First I will make sure nothing came loose on either of them.

 

[zbomb88]

Pulled the carbs apart and they appeared to be ok. One of the screen things (proper terminology?) seems a little dirty but I have a feeling that isn't my issue.

I then proceeded to remove the flywheel cover and had this nice brown watery crap come out and it seemed kinda foamy on the cover.

I am assuming this is from the hull filling up with water when I towed it and had the starter removed. Do I continue on and remove the flywheel? Water possibly screw up the electrical components in there that would make it start and idle rough but go no further? Is there possible damage to the lower end?

 

[bobob729]

What do ur plugs look like?

 

[zbomb88]

The plugs suprisingly looked quite good. I didn't run the ski too terribly long when it wasn't running good but still longer than I should have.

 

[zbomb88]

Possible stator? I am going to pull the flywheel off tonight and inspect further. It would be nice if it wasn't about 100 degrees here right now since I have to work on this instead of ride.

 

[augustaf]

Pulled the carbs apart and they appeared to be ok. One of the screen things (proper terminology?) seems a little dirty but I have a feeling that isn't my issue.
View attachment 225493
I then proceeded to remove the flywheel cover and had this nice brown watery crap come out and it seemed kinda foamy on the cover.
View attachment 225494View attachment 225495
I am assuming this is from the hull filling up with water when I towed it and had the starter removed. Do I continue on and remove the flywheel? Water possibly screw up the electrical components in there that would make it start and idle rough but go no further? Is there possible damage to the lower end?

Looking at the pics, your carbs certainly have corrosion from water intrusion and need to be cleaned properly - might be easier to replace with a used set. The bendix is junk (!) due to the water damage. Need to pull flywheel and inspect/ clean stator - it's probably still good. Clean drive bushings in case and cover and apply some grease

 

[zbomb88]

I have a rebuild kit coming for the carbs and will take care of those as soon as the kit arrives. Hopefully takes care of my slight hesitation problem. I removed the flywheel last night and found this. I am assuming this is the root cause of my problem. The bendix still moves very smoothly and I was not planning on replacing it. Everything on the stator appears to be ok so I cleaned it and the flywheel and put it back together.

 

[Speleopower]

I have been using a little dielectric grease and putting a thin layer of it on the gasket and around the rubber wire boot where it enters the flywheel cover. I then put some in an around the wires on the outside. This seems to stop all water from getting in. I took mine apart for the first time in about a year and a half and it looked super clean with just a little oil splatter from the bendex spinning.

You may want to do an air leak check on your engine just in case as well.
Are the carbs stock or have they had the plug/seals drilled out for aftermarket needles?

 

[zbomb88]

Unfortunately I don't know much about carbs in general. I have no idea if anything has been done to them other than being re-jetted when the pipe was installed. The ski was running great before my started went bad and I was stupid and towed it and managed to fill most of the hull with water. I have a rebuild kit arriving soon so I will at least rebuild the carbs while I have them off.

I like the dielectric grease idea. I was going to skip replacing the bendix but then I realized I would worry about it everytime. I have one on order and will through that in as soon as it arrives. I think the ski would be back up and running if I hadn't removed the carbs and wrecked the gaskets in the meantime. I am anxious to see if what I have done so far will get it running again.

 

[lanmine657]

Sounds like water in your ebox, crack her open look for water

 

[swapmeet]

Man, everything behind your flywheel cover looks rough.

What bindix did you order? Factory Yamaha or eBay special?

I would take your time, listen to the suggestions. Do a pressure test make sure you didn't blow a crank seal.
It's great that you've been able to ride this long without touching anything. I rebuild the carbs on any ski I buy, replaced the fuel filter and usually fuel line. Drain the tank....

Just take your time and ask a lot of questions. It sounds like you might not be super familiar with what's 'ok' and what isn't. Good luck, hope you get it figured out.

 

[zbomb88]

Ebox is dry. It was really nasty behind the cover. Turns out, when you fill the hull with water and have the starter removed, water gets where it isn't supposed to. How about that? Ebay special? Really? I am offended. So far my parts have been ordered from Jetmaniac (who is awesome), and the starter I ordered from SBT. I know enough about skis to be dangerous, but not enough where I can just look at it and know what is wrong. Fixing cars on the other hand is easy for me. I am pretty certain my issue is related to all that crap behind the flywheel cover. I figured while my ski is down and out I might as well take care of the carbs as well. My parts from Jetmaniac should arrive today and I should get everything back together over the weekend. (sorry for the single paragraph, my work computer doesn't like spacing)

 

[Kawy750]

I cant believe that engine even started with the stator and flywheel looking like that!! Dont kick yourself for towing the ski in and filling the hull with water. That problem with water getting passed the flywheel cover has been going on for quite some time by the looks of it!!

 

[zbomb88]

The ski started up so good!!! I put the starter in it while it was on the trailer and it started up so I figured it was good to go. Put it in the water and it hardly runs. I was quite surprised at how nasty everything looked since it did actually run. My wife just texted me and informed that my parts came in! Unfortunately I have to spend the rest of the afternoon at work.

 

[zbomb88]

I rebuit the carbs and re-installed everything. The first time I cranked it over it fired and died right away. Now it won't fire at all. Spark seems to be good. It doesn't help to put fuel right down the carbs either. Did I maybe screw something up with the carb rebuild or can I sort of rule that out for now since it doesn't run with directly putting fuel down the carbs???

I did not adjust the stator, all I did was clean it up.

 

[zbomb88]

Attempted to check the stator and here is what I got: "Charge Coil" AC output - brown/white and ground started at 60 volts and then dropped down to a steady 19 volts. The pulsar coil - white/red and ground I got a steady reading of 2.7 AC volts. The thread on testing these said the "charge coil" should be between 30-50 volts and the pulsar coil should be bewteen 4-5 volts. I took these readings on my Bluepoint digital multimeter. Ohms on the white/red and ground wire was 14.6, and the brown/white and ground was 480.

http://www.x-h2o.com/threads/80278-how-do-i-know-if-my-stator-is-bad

Not sure if I tested this 100% correct because I had to jumper the wires back together to get the ski to start and then used allegator clips on the jumpers to get my readings (other than the resistance readings)

To me the readings seem on the low side, but enough to make it not start? The inside of the flywheel was a little discolored/rough, should that be a concern?