Sunk superjet, now won't rev under load

[JFGJetski]

Ended up sinking my superjet, ran great before it sunk, sunk it then I pulled it out took spark plugs out cranked all the water out put new spark plugs in changed the gas ran good in the garage, I wasn't able to get it back in the water until now which was 4 days ago when this happened now it won't rev while in the water it rev's fine out of the water though. I did notice some pretty milky water coming out of the carbs when I was trying to get it started in the garage. Any help would be much appreciated thanks

Btw I'm running an xscream 771 with bpipe and I belive 46mm carbs


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[JFGJetski]

Also I have good spark in both cylinders but when I pulled the spark plugs it almost looks as if the front cylinder isn't burning as the spark plug looks almost new. But at the same time It'll fire up on both cylinders with only one spark plug wire hooked up

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[JFGJetski]

This is front vs rear.... based on this and having good spark leads me to belive that I should clean the carbs or my front reed is damaged.

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[JFGJetski]

Sorry I guess what I should have said is I rode it for a little while right after sinking it but it still had bad fuel and probably bad spark plugs in it so it wasn't reving out, but after that I pulled it got new gas and plugs and haven't had it in since

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[JFGJetski]

Also question, I have spark in my front cylinder but nothing showing that it's burning based on the spark plug, would a cracked Reed stop air fuel mixture from getting into the cylinder?

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[Big Kahuna]

Yeah, you still have water residue in the motor still "water" fouling your plugs........ Check your fuel tank for water. ( I have never once had water get in my tank - I even did a nose stab once with no hood on........ Plenty of fountains that ended up choking the motor out). Your carbs could have water inside the circuits, this will cause you to not rev out under load (Lack of fuel supply - water blocking some of the fuel). Focus on getting water out of the motor completely first............ and ride it if you can.

 

[JFGJetski]

Yeah, you still have water residue in the motor still "water" fouling your plugs........ Check your fuel tank for water. ( I have never once had water get in my tank - I even did a nose stab once with no hood on........ Plenty of fountains that ended up choking the motor out). Your carbs could have water inside the circuits, this will cause you to not rev out under load (Lack of fuel supply - water blocking some of the fuel). Focus on getting water out of the motor completely first............ and ride it if you can.

Weird, when I drained my fuel there was a good bit of fluid thar came out clear before it turned green, I'm assuming it all came through my breather

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[KMN]

Weird, when I drained my fuel there was a good bit of fluid thar came out clear before it turned green, I'm assuming it all came through my breather

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When I sunk a ski my fuel tank filled up with water. I disconnected the fuel lines and sucked out some water (to create a siphon) and drained the water until fuel came out (fuel lighter than water, so the fuel was on top). Hard to say what your problem is exactly, but keep going through it now before more damage happens.

 

[JFGJetski]

Well I found quite a big issue and didn't even realize till I bore scoped my intake..... God damn bolt in my Reed cage, lucky it didn't get into the crank case and start banging stuff up. You can see where the bolt came from....

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[Big Kahuna]

You got lucky!!!!!!!!!!!!!! I found a bad crank bearing by fluke a few years ago. Had a funny issue and just grabbed the coupler and rolled the motor around and I hear was sounded like a ball rolling down and hitting, did it again and knew what it was. The cages for the bearings had failed, bearings were free floating in the bearing assembly. Had just come home from the beach, last ride was from the gulf side back around to the bay side to load back up............ Alone!!!!! Motor may have lasted a few more minutes!!!!!! Sometimes we get lucky and find that bolt like you did!

 

[JFGJetski]

Well pulled the intake to get to the reeds, got the bolt out but it managed to break one of the Reed pedals, so ig it's full engine tear down time

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[JFGJetski]

And yes the treads look fine but I am for sure lock tight in them now

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[JFGJetski]

Never dealt with a broken Reed before, in yalls opinion how bad can a Reed pedal mess up the engine?

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[JFGJetski]

A Reed Valve is a Check Valve or One-Way Valve. What good is a Check Valve that leaks or doesn't check Flow in one-direction?

How is the descending Piston going to push Fuel Mixture up into the Cylinder when the Fuel Mixture is leaking past the Reed Valve and out of the Carburetor?

Results in loss of Crankcase Compression which affects Carburetion and Fuel Mixture Flow into the Cylinder above.

Also called Primary Compression.

Cylinder Compression is aka as Secondary Compression.

Need Good Compression n both Lower and Top Ends for a good running Engine.

I know that.... I mean how much damage do you think a carbon fiber reed pedal would do if ingested... I bore scoped the engine for over an hour and couldn't find anything major, of course you can only see so much with a bore scope, what are the chances I can just replace the reed and be fine?

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[fastgtfairlane]

I sank my ski once and when I thought I had gotten enough water out, put one plug in and left one out. Enough water was in the cylinder that it built up enough to break a carbon reed pedal and also bent the butterfly up on the same cylinder. It wouldn't run properly until I repaired the reed and throttle shaft.

 

[brapperdoodle]

I know that.... I mean how much damage do you think a carbon fiber reed pedal would do if ingested... I bore scoped the engine for over an hour and couldn't find anything major, of course you can only see so much with a bore scope, what are the chances I can just replace the reed and be fine?

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My initial thought is that it would probably be okay. If it was a relatively small piece I would assume it would just get sucked right back out the engine. Think about how much that tiny piece weighs and how much air is moving through that engine. Chances are it got sucked through.. Fog the chit out of that motor and send it! (obviously replace reeds)
But if you're OCD and have some time on the engine, crank seals and rings wouldn't hurt it Just a lil' freshen up

 

[JFGJetski]

My initial thought is that it would probably be okay. If it was a relatively small piece I would assume it would just get sucked right back out the engine. Think about how much that tiny piece weighs and how much air is moving through that engine. Chances are it got sucked through.. Fog the chit out of that motor and send it! (obviously replace reeds)
But if you're OCD and have some time on the engine, crank seals and rings wouldn't hurt it Just a lil' freshen up

Yeah that's my thought, only thing is it was the entire pedal, not just a little chip but like I said I couldn't see any major damage

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[smoofers]

Yeah that's my thought, only thing is it was the entire pedal, not just a little chip but like I said I couldn't see any major damage

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That's the beautiful thing about composite reeds. Generally, they don't do any noticable damage when they go through the motor. Stock metal reeds on the other hand will tear up a ring or bore wall. If you're worried, pull the cylinder and inspect thoroughly, but I doubt you will find anything that will need replacement form just a carbon reed being chewed up. Now water ingestion damage could be another story...

 

[JFGJetski]

That's the beautiful thing about composite reeds. Generally, they don't do any noticable damage when they go through the motor. Stock metal reeds on the other hand will tear up a ring or bore wall. If you're worried, pull the cylinder and inspect thoroughly, but I doubt you will find anything that will need replacement form just a carbon reed being chewed up. Now water ingestion damage could be another story...

Well I've already ordered a new reed and I really want the ski to be on the water for the 4th, as long as it can get me through the season I was planing on doing a full top end rebuild, only thing I'm going to do is wait on the new reed and comp test it and as long as that shows good I'm just going to wait

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[JFGJetski]

That's the beautiful thing about composite reeds. Generally, they don't do any noticable damage when they go through the motor. Stock metal reeds on the other hand will tear up a ring or bore wall. If you're worried, pull the cylinder and inspect thoroughly, but I doubt you will find anything that will need replacement form just a carbon reed being chewed up. Now water ingestion damage could be another story...

And even with the broken reed I've got a good amount of heat ran through it so I'm not too too worried about water

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