300reloader Posted May 11, 2023 Report Share Posted May 11, 2023 My 4 mil cub rips through 1-5, but as soon as I hit 6th it bogs way down. I don't think it's running out of fuel because I can downshift and it gets right back on the Powerband. Anybody know what could be wrong? Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted May 13, 2023 Report Share Posted May 13, 2023 Jetting is likely off. What carbs? What pipes? What jetting? Quote Link to comment Share on other sites More sharing options...
300reloader Posted May 14, 2023 Author Report Share Posted May 14, 2023 Keihin 39 pwks with 172 mains. Dont remember pilots. Shearer sb inframes at sea level. It was about 50 degrees on the beach if that matters. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
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