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HELP - GSX will not run/perform in water
- Thread starter rkkoeb
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I replaced all my fuel lines and fuel selector on my 96 GTS. I used a non-OEM selector valve, and it was totally broken. I ended up putting the original fuel selector back in, as my tempo lines hadn't degraded that much and the sea doo is running fine. As others have stated, bypass the fuel selector and see if that resolves your issue.
JJinSC
Well-Known Member
So I checked the manual and that year’s manual does state 1 for the low speed adjustment for the SPX/XP/GSX/GTX. BUT, i have been told that is incorrect in that manual. The low speed from every other resource I have had states the correct setting is 1.5 for the 787 engine and carbs.
Move it to 1.5 and see how it does.
Seadoo timebomb
Member
How did the ski run before doing all of this work? If you can slightly pull out the choke and ski falls over or dies then dont richen up the carbs. Leave them at 1 turn open on lows and close both of the highs for now.
Give some history to why the work was done.
Give some history to why the work was done.
rkkoeb
Active Member
Ok might found the problem. Took the new needle and seat out and was looking at it to make sure it was clean. I notice the hole seems to be small so luckly I still had the old seat. old set is clearly marked 1.5 and is the top one in this pic. The hole is much larger then the seat in the lower part of the pic which was to be my new ones. Is this my issue?
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rkkoeb
Active Member
unfortently it was just a pice of dirt plugging up the hole. Cleaned it out and it looks the same now. Verified that they are 1.5 as I purchased them for OSB Marine. Went back to basic pulled both carbs completly apart and made sure every was perfectly cleaan. Pop off pressure on both carbs at 34 psi. Followed instructions in the form on carb rebuild to make sure everything is correctly put together. Carb kits are mikuni from OSB. Put everything back together and took it for another ride. Same thing boggy low end but great top end. Turn low speed screws in to half turn and same thing. Turn screws out to almost 2 turns and same thing. On my way back home I rememberd that I had to purchase new pilot screws and they were damaged when taking out. I need to check with dealer and make sure I purchased 70 piloet jets. Main jets are for sure 142.5 as I did look at them.
JJinSC
Well-Known Member
I’m sorry to hear that. Hopefully you have a dealer with a good and honest tech. It seems your issue changed sometime during all this. Can to describe what you mean by boggy on low end. Did you check to make sure the accelerator pump , lines and nozzles were functioning correctly?
Let us know how it turns out at the dealer.
Let us know how it turns out at the dealer.
Try this,,if on the trailor,,,motor off, air box off and out of the way,,,turn the pilot all the way in...it should go in smoothly,,,then turn it out to specs,
start the motor,,,then slowly turn the pilot in till the motor quits,,,if it does not quit,,,your pilot is too big.
Sometimes,,,If I am setting the low speeds,,,I will back the ski on the trailor into the water deep enough for the pump to cool the motor,(I have even done this with the ski and me in shallow water of course,, attached to an anchor,,,it moves around a bit,,,but no problem) ,,and will repeat the process,,,now it is under load,,,if you turn the pilot all the way in,,,and it still runs,,,your pilot jet is too big.,,,it should lean out and "die".
Conversely,,,mikuni carb pilots have little affect nearing 3 turns out,,,they work best from 5/8 min to 1 and 1/2 out,,,if you need to turn them out more,,,you need a larger pilot jet,,,the pilot is very sensitive,,,1/8 either way can make the motor responsive or not.
Make sure that seat in the needle and seat is not leaking,,,if it leaks,,,you will always have a rich bottom end.
start the motor,,,then slowly turn the pilot in till the motor quits,,,if it does not quit,,,your pilot is too big.
Sometimes,,,If I am setting the low speeds,,,I will back the ski on the trailor into the water deep enough for the pump to cool the motor,(I have even done this with the ski and me in shallow water of course,, attached to an anchor,,,it moves around a bit,,,but no problem) ,,and will repeat the process,,,now it is under load,,,if you turn the pilot all the way in,,,and it still runs,,,your pilot jet is too big.,,,it should lean out and "die".
Conversely,,,mikuni carb pilots have little affect nearing 3 turns out,,,they work best from 5/8 min to 1 and 1/2 out,,,if you need to turn them out more,,,you need a larger pilot jet,,,the pilot is very sensitive,,,1/8 either way can make the motor responsive or not.
Make sure that seat in the needle and seat is not leaking,,,if it leaks,,,you will always have a rich bottom end.
rkkoeb
Active Member
The needle and seat was not leaking. I did a pop off test on both carbs and they hold pressure until about 34 then they pop off and then reseat. I just dropped off the Ski at the deal yesterday afternoon to have them look at it. I will let everyone know what they find out but after talking with them last night they are stumped right now. They are going to pull the carbs off and see if they can find anything wrong. I told them to inspect the piolet jets at that time and make sure they are correct. They said they should be able to look at it yet this week. We will see what they can find wrong. The dealer did tell me in the past they have seen were they had to replace the carbs because nothing worked. Dealer told me to at least look around for a used set just in case
GGuillot
Well-Known Member
Not trying to beat you up over getting this right, you have it at the dealer now. But low end boggy off idle and good top end points to the 4 holes in the carb barrel for the low speed circuits. That's the reason I asked about the highly compressed air, but you didn't answer. Did you spray either brake cleaner or carb cleaner in the stripped carb barrel? blow out every little hole with compressed air? And when you did, go back and do it several more times? I went through nearly a complete can of brake cleaner on the carbs and blew shit out at 100+ psi. Each time, both skis, I put them on perfect, no doubts in my mind, and they haven't been back off since.
rkkoeb
Active Member
Yes I used my air compressor to blow out everything, not sure exactly what the PSI is set at but I know not at 100. Regarding the four holes, I made sure all three of the mini holes plus the one larger hole were clean. Ran carb cleaner through making sure I could see it streaming out of all four holes followed by compressed air. Maybe I missed something cleaning them out but I have taken them completely apart several times and clean them but I guess I will have to wait and see what the dealer says.
rkkoeb
Active Member
Update: Pilot jets where wrong. Correct ones are in and it runs outstanding. I am upset at myself for believing the dealer would give me the correct jets when I purchased them. Both where the wrong and not not even the same size. Note to self, ALWAY verifiy part numbers before putting items into carbs. I have the paperwork showing I purchased 70 jets but I guess not
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