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When I had a 97 RMK, I added SLP's Power Packs to the carbs. The 97 engine with the Keihin carbs is notorious for a low end stumble, I tried jetting and idle changes but those didnt' help much. The Power Packs worked well to eliminate the burble. FWIW
Polaris - SLP Power Pack
SLP's single pipe works really well, follow their clutching recommendations as well as jetting for best results.
SLP's Power Packs are inserts that go in the Keihin carbs. They make the flow into the carb more laminar for better mixing at lower RPM. I don't know of anyone else that makes 'em. If you have the boost bottle, that is also something that has shown to help. I was unaware they made 'em for a 97, when I put a 2001 engine into my 97, I used the boost bottle and the power packs and my low end stumbles were gone.