waverunner 3 carb adjustment

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Posted on August 29, 2020

I'm not getting fuel to the carb on my 650 waverunner 3. Gas and diesel marine mechanic.40 yrs.

on the WRIII, even if the engine wouldn't draw fuel on its' own, the primer bulb should pull fuel into the line from the tank. When I got it out a couple of weeks ago, I wasn't getting fuel so I assumed a bad diaphragm. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc. 1. It will have an arrow cast into it that is indicating the fuel flow is out of the carb on that fitting, and the lower fitting has an arrow indicating fuel is coming into the carb on that fitting.I did refer to a service manual that provides an accurate drawing of all the line routings and it does in fact verify that the fuel line coming off the fuel filter connects to the lower fitting on the carb.

I cannot verify that there is a perfect seat but if anything, it should maybe be flooding but shouldn't affect whether I am getting fuel flow.

If the electrodes appear white or cream-colored, adjust the jet screw clockwise by 1/8 turn to enrich the mixture.Clean the new plugs with alcohol and a small wire brush. Fires for a second when I pull the plugs and drip fuel in the cylinders. The only thing that I see in your response is the fuel line locations. Then starts & runs fine all day. Turn it counterclockwise if the color appears white or creamy. FAST & Free US Shipping.

Install new, properly gapped spark plugs into the head and tighten them with a socket. Tighten with a socket.

I suspect fuel pump.

I must pour a shot of fuel in a spark plug hole a couple of time until it catches. Refer to your owner's manual for their location. I even installed a primer bulb inline to help with getting fuel to the pump. Since you retained the same needle and seat and only changed the spring, the odds are this is not the case. Ref# Part. Float is set to spec.i have a 1990 75 hp mercury good compression, spark on all three cyl,on the muffs its only running on top carb and raw gas is pouring out exhaust carbs have been gone thru float setting is correct inli have a 99 Yamaha wave-runner XL1200 and it has hoses coming from the primer pump that are just hanging inside the jet ski. Right at this point I am not quite yet ready to send you back into the carb, I feel like we have some other things to look at first.The other curious point you made was why is the primer bulb not drawing fuel? If the color appears too white or black, locate your high-speed adjuster screw, if you have one, by referring to your owner's service manual.Turn the screw clockwise if the color appears black.

Here is a diagram of the carb taken apart and the Body 2 is reference #39.I am also curious where and what line you installed the fuel bulb in and why that doesn't work.Did you just recently rebuild the carb, or did you rebuild the carb and the ski sat for a while before being used.

It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.I couldn't be more satisfied! Price. Since you had it out to clean, it should not be stuck after a week or two. 6R8-14301-02-00 6R8-14301-05-00.

As these screws are turned out, the fuel mixture is made richer. I have double checked everything we have talked about. They really helped put my nerves at ease. From there, I chased all the things we have mentioned. I am sorry to hear that it isn't running on its own yet.Sadly at this point, if you are confident you are getting the positive and negative pressures on your vacuum line, you are going to have to go back into the carb and double check the internals.Although the 650 wasn't known for the problem, I would pay close attention to the check valves on the "body 2".

Either a clog or restriction in that line or a hole or crack in it preventing the pressure differentials being created by the crank case to be transferred to the fuel pump.

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