1998 ZXI 1100 Carb Adjustment - Page 4 - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #31 of 34 (permalink) Old 10-10-2019, 02:07 AM Thread Starter
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I have never replaced gaskets or diaphragms in the carbs. Visual inspections look good but that can be misleading. I am going to order a full rebuild kit for all carbs in the off season and replace. You have talked about pop off frequently. I know what that is but I have no clue how to measure it? I will check the sync in the carbs as I have them home for the winter with the reed valves too. They will all be measured and set correctly. I am still curious why the # 1 plug reads so differently. You mentioned fuel lines and pick up tubes but they are all common to all three carbs? They carbs have fuel rails. I am wondering if my entire problem is related to carb #1?
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post #32 of 34 (permalink) Old 10-10-2019, 04:47 AM
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Pop off is the pressure it takes to unseat the needle. It is controlled by a spring and is critical to starting and low speed. it is checked with a pop off gauge. Mikuni makes a nice one. 0-100 psi is what I recommend. Pop off for the cv carbs I believe is 18psi. Check sbt for a kit. There really wasn't much of a kit offered for the cv carbs, but I think they had a wsm half kit I'll call it. Get the pop off gauge and test that before installing the kit, and I would NOT use the spring or needles in the kits. Just really use them for the gaskets and diaphragms. You can try the needles if you want, but the pop off must stay the same. Also check to make sure the return lines are not plugged. There should be a restrictor in the #3 carb before it goes to the tank, and make sure the return between carbs and the tank is not plugged. Pick ups in the tank have little filters on them. They can get plugged.
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post #33 of 34 (permalink) Old 10-10-2019, 10:07 AM Thread Starter
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Thanks for the precise directions on the pop off. I will look at SBT for a gauge.

I still don't understand the fuel intake scenario you talk about. I have ONE fuel hose feeding all three carbs and ONE return line. There is a hard fuel rail between all three. I will run a wire through the intake and return rails to check for obstructions. Attached are pics of the carbs. You can see the one fuel line and return line in the front.

I will look for a "half" carb kit with gaskets and diaphragms only. Thanks again.
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post #34 of 34 (permalink) Old 10-11-2019, 04:42 AM
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