1998 gsx limited carb adjusting question

[blown1993]

in the 1998 gsx limited shop manual, it says adjust the low speed screw to 2 turns out, then adjust from there. They dont say anything about adjustment of the high speed screw. On the seadoosource website, they say for the 5625 gsx limited 1 3/4 for the low speed screws and 0 for both high speed screws. For the 5629 gsx they say 1 1/4 for the lows and high speed screws mag 0 and pto 1/4. why is all of this information different? I havent found a 5625 and a 5629 manual, but you would think if they combine them into one manual they would put the numbers for each model. I know the 2 models have different carbs, you would think the book would document this properly.

I ran the jet ski yesterday at the 1 1/4 settings and it seemed to run better.

as for the high speed screws, mine were not set like this, mine were originally both at an 1/8 or so, in the middle of the 1/4 turn. I put the mag at 0 (lean) and the pto at 1/4 which is full open (rich)

before all of this both my spark plugs came out a nice tan color so I probably shouldnt have messed with it.

any advice would be awesome.

 

[Dr Honda]

If it was running right... then you shouldn't have messed with it. But.........

OK... here's the deal. SeaDoo does a good job of jetting, so they run the high screws at 0 turns out. (normally) On some models, they run the PTO at 1/4 turn out to keep the piston from sticking. You can safely open both high needles, and the worst that will happen is you will foul plugs.

The low needles aren't like the high needles. They control the low mix (idle, to just off idle) but don't change the total fuel in the "pilot" fuel circuit. The low needle is used to give a smooth, stable idle, and transition to mid throttle. (The high needle can add more fuel than the main jet can supply at high RPM's)

The reason for different specs for different models is because of the fuel available in the region that the ski is sold into.

 

[blown1993]

well so I dont remember exactly where the high speed screws were before, but I now have the one at 0 and the one at 1/4 (all the way) out. the slow speed screws are at 1 1/4 but this is not shown anywhere in the manual, this number came from seadoosource.

When I put it back together this morning after removing some old inline filter and replacing all the fuel line and oil filter. I noticed that the fuel pump accelerator, with the machine off, the plunger is pushed in a little bit, when giving it throttle it squirts gas, but the plunger never gets pushed all the way in, I was wondering if this is normal. I messed with this a little bit, but ended up putting it back exactly where it was which seemed a little out from where it is supposed to be by the books procedure.

before today, it would start right up without hitting the throttle at all and the plugs were coming out perfect. After today, it still runs great and the plugs are a tan color, slightly lighter than before but still good. Only thing different is that it is hard to get started, I have to hold the throttle a little open and it gets a little sputtery right when it starts, but clears out quickly and then runs fine.

so only thing different I can see it the change in high speed adjustment that I made, but this shouldnt be affecting starting, only other difference is the little movement that may have been changed on the pump. I also removed the old dirty inline filter and went to the way its supposed to be setup with the factory filter/strainer.

what does that fuel accelerator pump do? this isnt the actual fuel pump is it? If i remember correctly, this is in a different location than the fuel pump and opposite than the fuel inlet line.

Anyone familiar with this stuff?

thanks alot everyone.

 

[Dr Honda]

You are right... the high screw has nothing to do with starting. If you have to open the throttle a little... then that tells me your needle is leaking, and you are flooding the engine a little. (The needle inside, that is hooked to the regulator diaphragm) OR... the accelerator pump is leaking.


The accelerator pump is to give an extra squirt of fuel to help keep the engine from stalling when the throttle is opened quickly. SeaDoo doesn't use it's full stroke, so what you are seeing could be normal. If it's not bound, and it's squirting... then it's probably fine.

 

[blown1993]

while looking at the lever on my accel pump I noticed a few things. Instead of all the brackets being square/perpendicular/parallel to each other, I noticed that the lever that has the adjustment screw going through it is slightly angled downwards, almost like the spring is too tight. the area between the two pieces where the adjustment screw pushes on the lever to me doesnt looks completely square. If I manually hold the lever up so that it is square, and then set the screw to spec, then when I release it it pushes on the pump shaft too much like its already trying to squirt. Im wondering if, no matter the overall condition, if you set it to just where it touches and then a 1/4 turn more, will it still work the way it was meant to.

Basically only thing im saying is that the levers/adjuster screw tab dont look like the way they would have come from the factory. May have to try it both ways and see.