1998 ZXI 1100 Carb Adjustment - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #1 of 34 (permalink) Old 08-01-2019, 04:25 PM Thread Starter
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1998 ZXI 1100 Carb Adjustment

I have had this ski for 12 years. The ski had a hesitation issue out of the hole when I bought the ski. I changed the low end jets from the stock 35 to 50 to lean in out. Changing plugs never helped. Initially it solved the problem but it is back again. I have some 45's and the original 35's. Has anyone had the hesitation and bogging down issue out of the hole with this ski. If so, how did you solve it? I did not change the main jets because the top end is awesome. Fun ski without the bog issue. TIA!

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post #2 of 34 (permalink) Old 08-02-2019, 05:58 AM
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The cv's have a inherent lean stumble off idle. Going to a 50 pilot jet would have made it richer which is what you need. When is the last time you thoroughly cleaned the carbs and verified pop off ? The trick is telling the difference between a lean stumble and a rich bog. There are also low speed screws that are capped at the factory. If you remove the caps, you can adjust the screws a tad to help also.
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post #3 of 34 (permalink) Old 08-03-2019, 07:32 AM Thread Starter
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Thanks for the tips. I haven't had them apart in years. Going to pull them and clean them up today. What is popoff? Also which direction on the screws for rich/lean? I was tempted to try the 45’s because I thought it might be a rich bog. Although I’m not sure exactly how to tell the difference. If I feather it a few times they usually get going. The carps might be coming off a few times. What’s you gut feel on rich or lean with the 50’s in? Thanks again!
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post #4 of 34 (permalink) Old 08-03-2019, 08:28 AM
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50 should be richer. Hold the jet up to the light and compare the hole. The 50 is larger. That's as large as I would go. Pop off is around 15-18 I believe. Backing the screws out makes it richer. The pilot screws are to be set for smooth, highest idle. If they're right, and pop off is good, it will start instantly hot or cold, and should fire off easily after sitting a day or two. I'm assuming it still has the choke ?
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post #5 of 34 (permalink) Old 08-03-2019, 09:51 AM Thread Starter
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The original 35’s has a larger opening than the 45s I have? That’s why I was confused about lean and rich. I’ll check the 50’s to confirm that. As far as starting and idling the ski is awesome. Coming out of hole on low end is the issue. Not sure if it’s lean stumble or rich bog. If I bring ski back to idle most times it clears and goes if that any help.
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post #6 of 34 (permalink) Old 08-03-2019, 12:22 PM Thread Starter
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I think I found part of my issue if not all today. When I pulled the air cover off I found the rubber air intake tubes dry rotted. Some big pieces even fell into the carb air intake. Where is good place to buy old Kaw parts? I'm going to fix this first and test before messing with jetting. TIA!!
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post #7 of 34 (permalink) Old 08-03-2019, 08:56 PM
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Get the part number from partzilla and look on ebay or amazon. They are available new.
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post #8 of 34 (permalink) Old 08-03-2019, 10:35 PM Thread Starter
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Found 3 on amazon. Coming soon. Pulled carbs anyway. I’ll pull out the 50’s and look at them.
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post #9 of 34 (permalink) Old 08-04-2019, 12:28 AM Thread Starter
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The 50’s have smaller openings than the stock 35’s. I’m thinking of trying the 45’s. May have gone a little to lean. Must have been a rich bog initially.
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post #10 of 34 (permalink) Old 08-04-2019, 08:40 AM
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Not sure whats going on there. Maybe the 35's were drilled out. The larger the number is supposed to be a larger jet. I've been searching my butt off to find anything that dismisses this for the cdcv's, and cannot find anything. Compare the 45's and 50's.
With the tubes missing and damaged, it changes the pressure in the carb that will change how fuel is pulled (in a nut shell), and the cv's are extremely temperamental to any changes of that sort, hence the reason people say to leave the choke in place.
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