Hey guys! So I have a 701 superjet and have been having issues with it lately. A while ago when I was riding it died on me while riding in the ocean and checked the plugs and there was water getting into the cylinders, and fouled the plugs, so ordered a new head gasket and installed it and that fixed the problem but next time I took it out it worked perfect for about an hour and same thing again! Water in the cylinders and fouled plugs, and then took it apart again fixed it and again worked for about an hour again.been getting annoyed with this thing and just wondering what else it could be or what I could be doing wrong, any help would be very appreciated!
Advice / help please!
- Thread starter cade_dutt
- Start date
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
What are you torquing the head bolts to? Also what pattern are you tightining them? Maybe a warped head?
Have you tryed not replacing the gasket but letting the ski air out overnight? May be a different issue all together that fixes itself in the time it takes to order and replace a head gasket.
Run it strapped on the trailer with the hood off at different throttle positions and look for anything funky like the cuper slinging water into the carbs or a hole in the cooling lines?
Have you tryed not replacing the gasket but letting the ski air out overnight? May be a different issue all together that fixes itself in the time it takes to order and replace a head gasket.
Run it strapped on the trailer with the hood off at different throttle positions and look for anything funky like the cuper slinging water into the carbs or a hole in the cooling lines?
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
Are you running a stock airbox and do you have a good good seal. Start simple.
- Location
- Ontario, Canada
^^ What he said. I can't stand the stock airbox. That big tube holds water like mad and the rubber angled tube on the end is the perfect water scoop when the ski gets put onto its side. I had much better success without the stock airbox and using the conical flame arrestors for consistent performance. With the stock unit, I was constantly having to run the water out. If you decided to stay with the stock airbox, the best almost cure to the water shovel is to change the position of the rubber tube. It has a little notch cut out to aim it toward the flywheel cover, rotate it so it is level with the hood seal flange. This will help keep the air coming in when the ski is put over on the sides rather than guzzling water.
Yes I torqued them all to 15 lbs, I did 8 like it said at first but it seemed bot nearly tight enough, and did the correct sequence that is numbered, running the stock head, and the carb bottom and top seals are brand new also if that's the seal you are talking about. And also I assume the air box you guys are talking about is the 62t air boxes with the duel carbs? Because I have the single carb 61x air box, and only reason I decided that was not the problem is because when I run it on the hose it will die from water getting into the cylinders
- Location
- Ontario, Canada
Yes sir, I was referring to the 62t stock dual airbox. There are not many places water can enter the system like that so when you say it is happening even when on the garden hose it leads me to believe it could be either a bad base gasket letting water into the cases, or a bad exhaust manifold gasket at the block. The only other possibility is if there is a crack in the water jacket wall internally. Has the ski ever seen below freezing temps such as winter storage in a garage, barn or outside on the trailer? A buddy of mine had this happen to his head pipe. It had a small hard to see fracture from freeze splitting and didn't show up until about 2 months into the ride season. The heat expansion from running it, then contraction from cooling when sitting for the night over the two months or so, coupled with vibrations worked it open enough to become noticeable.
Edit: I should have mentioned a warped head too.
Double Edit: I should have also mentioned if you have loose fasteners securing the base to the cases
Edit: I should have mentioned a warped head too.
Double Edit: I should have also mentioned if you have loose fasteners securing the base to the cases
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
Stock 62t air box is excellent at keeping water out. I have no issues with it.
- Location
- Ontario, Canada
My experience with it has not been so positive lol. I am also not keen on how difficult it makes carb adjustments. But that is only how it has been for me, just a small drop in the lake of experiences and opinions. I can say to its credit though, it is solid and reliable at being a flame arrestor. My old R&D Pro-Lock conical arrestors were great for only about 2 months and fell apart. The performance was great, but the life span of them was terrible. What about the water invasion issue he's having? Loose fastening hardware? Blown gasket? Warped head? Or split in the water jacket? I don't believe there are any other options do you?
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
He needs to figure out if the head gasket is actually fixing the proBlem or not. If hes really getting a temp fix from a new gasket, then it might need the cylider decked or the head replaced.
If not, i woukd start with making sure its not coming in the intake.
Then thriugh the exhaust. (Leaning boat over, back pressure on landjng, damaged top b pipe screw)
then gaskets
then warpage to the surfaces or pitting
If not, i woukd start with making sure its not coming in the intake.
Then thriugh the exhaust. (Leaning boat over, back pressure on landjng, damaged top b pipe screw)
then gaskets
then warpage to the surfaces or pitting
Thanks for all the help guys, after reading all the responses my next thing is It sounds like it could be a warped head, hope it that and not the cylinder top. I never really considered it could be this because I love never had any cooling issues and usually runs pretty cool, but I have a 650 head I will try if that work. Thanks again
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
How do you know the head is the problem? I mean, ive had exactly what you describe dozens of times and not once was it a head gasket. Ive never even considered taking the head off when i saw water on the plugs. There are so many simpler explinations.
I had a water ingestion problem caused by cheap oil. It didnt let the motor push small amounts of water out as it should so ir eventually accumulated.
just because you took the head off and put it back on doesnt mean it was the problem or fixed it. You may have simpky dried the cylinder and it started again.
Try riding it without abusing it in the surf. Strap a gopro to the gas tank to watch the intake. Do a compression check to see if the gasket is holding. If water comes in, air also gets out.
some diagnosis can be done without throwing parts at it and it sounds like your first step was a $20 head gasket
I had a water ingestion problem caused by cheap oil. It didnt let the motor push small amounts of water out as it should so ir eventually accumulated.
just because you took the head off and put it back on doesnt mean it was the problem or fixed it. You may have simpky dried the cylinder and it started again.
Try riding it without abusing it in the surf. Strap a gopro to the gas tank to watch the intake. Do a compression check to see if the gasket is holding. If water comes in, air also gets out.
some diagnosis can be done without throwing parts at it and it sounds like your first step was a $20 head gasket
