I dont run a return. Yamaha never did. I think that's some xh20 stuff that only jet ski carb guys profess. My ski runs fine without it. How would adding backpressure to my fuel supply help negate fuel dribble? Of anything it would make it worse.
No one has explained the logic behind the carb needing a specific return pressure. Just people have swapped parts and said their setup magically works now. Thats shade tree and I dont listen to it.
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Usually the restrictor is built into the carb, some aftermarket carbs have that drilled out and require an external restrictor. All carbs require some sort of restrictor whether it is built in or external, I'm not sure how you could be getting away with neither, might be that by chance your fuel lines are providing enough restriction, or you still have the internal built in and don't know it.
If you drill your internal built in restrictor and run an external one that is effectively larger to get lower fuel pressure, that is a way that it can reduce dribble.
I've never tried running with no restrictor at all, but I know it's a common problem for people with old kawasakis as some of those used carbs with external restrictors and people swap things around and end up with no restrictor and their ski doesn't run right, so it is not true that you will be fine with nothing. You might get lucky with a setup that by chance has enough restriction built in, but I don't think it's good advice that nothing is needed at all, most people with unmodified carbs don't need anything because it is built into the carb.
