PorkChopsM
New Member
Hey everyone, new Seadoo owner but not new to carb repair and troubleshooting or riding these in my youth. I purchased what looked like a well cared for 1994 GTS a few weeks ago and was able to run it strong for two days before encountering trouble. When using it on a third day I was idling and waiting to pull a wakeboarder and the ski cut out. I was able to restart it to a very rough idle with no power and since then I have not been able to get it to run normally.
Things I did wrong that may have contributed:
- Used gas with ethanol but did use octane booster (I know... I know...)
- Topped off oil with Yamaha W2
Symptoms:
- YouTube of it running located here:
- Very rough idle when I get it to start (requires multiple starting attempts and it will usually idle for 10 to 15 seconds before dying)
- No change in or out of the water
- Giving it throttle has zero to extremely little change
- Choking the engine instantly kills it
- Very dark oil residue coming out of the back/bottom when testing dry
- Fuel before and after fuel line replacement appeared to be flowing fine
- I took out a spark plug and the pressure seemed strong -- I don't have a compression tester but could rent one if needed.
I have searched these forums a lot prior to posting and tried to research what I could. Here are the troubleshooting steps I took:
- Grey fuel lines replaced with clear marine tubing -- replaced each line at a time validating the lines are routed properly and can see gas moving when idling. Grey fuel lines did have some green residue inside but didn't appear horrible.
- Fuel selector replaced with one from ODS
- Replaced the spark plugs with the right NGK ones and gapped at .20 and validated it's getting spark
- Used the ODS carb kit to replace the carb filter (filthy), pump gasket, and diaphragm gasket. There was quite a bit of sand in the carb. Completely cleaned and scrubbed it down. I did not replace the other carb components because they seemed to be functioning.
- Emptied the gas tank and cleaned it out completely -- didn't have much inside except some sand and other minor debris
- The fuel baffle is clean and there was no filter/baffle at the end (I don't think the GTS's came with anything?)
- Validated fuel filter is clear and it appears the o-ring is seating properly
- Partially filled gas tank with rec no ethanol gas
- Fully charged the battery
Again, after all of the troubleshooting it ran exactly the same as before I started and still rough idled identically. Did I make a mistake to not break the carb down completely per this write up? It just didn't seem to be in nearly as rough shape as the one in the tutorial. This forum has great resources and has helped me get this far. Any ideas on other things I can try? I really thought after all I read this would take care of the problems along with the new fuel. Thanks!
Things I did wrong that may have contributed:
- Used gas with ethanol but did use octane booster (I know... I know...)
- Topped off oil with Yamaha W2
Symptoms:
- YouTube of it running located here:
- No change in or out of the water
- Giving it throttle has zero to extremely little change
- Choking the engine instantly kills it
- Very dark oil residue coming out of the back/bottom when testing dry
- Fuel before and after fuel line replacement appeared to be flowing fine
- I took out a spark plug and the pressure seemed strong -- I don't have a compression tester but could rent one if needed.
I have searched these forums a lot prior to posting and tried to research what I could. Here are the troubleshooting steps I took:
- Grey fuel lines replaced with clear marine tubing -- replaced each line at a time validating the lines are routed properly and can see gas moving when idling. Grey fuel lines did have some green residue inside but didn't appear horrible.
- Fuel selector replaced with one from ODS
- Replaced the spark plugs with the right NGK ones and gapped at .20 and validated it's getting spark
- Used the ODS carb kit to replace the carb filter (filthy), pump gasket, and diaphragm gasket. There was quite a bit of sand in the carb. Completely cleaned and scrubbed it down. I did not replace the other carb components because they seemed to be functioning.
- Emptied the gas tank and cleaned it out completely -- didn't have much inside except some sand and other minor debris
- The fuel baffle is clean and there was no filter/baffle at the end (I don't think the GTS's came with anything?)
- Validated fuel filter is clear and it appears the o-ring is seating properly
- Partially filled gas tank with rec no ethanol gas
- Fully charged the battery
Again, after all of the troubleshooting it ran exactly the same as before I started and still rough idled identically. Did I make a mistake to not break the carb down completely per this write up? It just didn't seem to be in nearly as rough shape as the one in the tutorial. This forum has great resources and has helped me get this far. Any ideas on other things I can try? I really thought after all I read this would take care of the problems along with the new fuel. Thanks!
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