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yes I'm a newbie to this site and even more importantly to jetski repair. My son just purchased an 88 Kawasaki 550. It has been bored out and I think has a larger mikuni carb on it. The base opening measures about 45mm. My problem is we just rebuilt the motor, new crank seals..the shop said everything looked good. There are three ports for fuel/pulse lines on the carb. I would guess that the big round piece on the side of the carb is basically a pulse activated pump, correct? I read somewhere else on here that the crank case pulse line goes to the center barb on the round device(lower part) the inlet is on the end of the round piece and the return line is towards the back(left) of the carb basically near the carb throttle body. The motor will only run if you pour gas directly down the carb. I have tried switching lines, took a large cc syringe and pulled fuel into the plastic bulb-like container(looks like a water separator). If I crank the motor over if after trying to put fuel into either the return or inlet, it just spits it back out. I took the pump apparatus apart and can't really see anything obviously wrong with any of the diaphragms. Shouldn't I be able to feel suction if i put my finger over the inlet, having the pulse line attached? I really sick of trying to figure this out and even more sick of how much $$$ i already have into the relic. I know my way around cars but 2-strokes are a different animal..baically, it acts like it isn't pumping fuel into the motor...any help would be appreciated.
 

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Hi, forgive me my bad spelling, it's because I'm dutch:D
If you take your carb and the pump is facing you,
then the niple on the left is the return,
the niple on the right is the underpressure (goes to crankcase)
und the last one on the pump is for the gasoline,
the base setting for all screws is 1 turn and then 3/4 turn
open,
also there needs to be a rubber ring inside of the feulpickup,
those are often missing, but the ski will not get enough gasoline
because pressure is leaking of the tank then,
also check the valve on the feulpickup, if you can blow inside from
the other direction then the arrow is pointing then you need to
replace it,
sometimes the 550 ski's with 44 carb won't run well if you use the
on/off/reserve switch, you better try to install the feullines straight
to the carb,
I hope I could help
greetingz from Holland
 
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