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I have a 2000 GP1200 that has Riva modifications on it. The issue I'm having only occurs above 4500rpm. It starts fine using the added primer and runs and accelerates perfectly at lower rpm's. My issue is that at WOT it will cut out and re-catch around 4500-5000rpm. Last winter the carbs were completely rebuilt, the summer before I replaced the fuel petcock. It seems like it has issues getting fuel unless you select "reserve" over the "on" settings. I'm not sure if this has anything to do with it. I also cleaned the fuel/water separator as well as replaced an inline fuel filter. This ski has been modified quite a bit, but up until last year it never gave me any issues. I'm the second owner. It's a blast to ride and I want to solve this issue.

Where should I start?
 
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