New carbs one cylinder fires with air filter & no air filters and perfect?

[J-WELDO]

Hello guys, got another stupid question.I put new carbs on my 4 mill cub,35mm keihns with a 160 mains and 48 pilots as told by my local shop (phils cyle),installed and test run at house,also switched from cpi inframe to out of frame cpi with silencers.everything was good at home.Took my bike out to dunes,ran one race my bike scared the hell out of me.The next race I lost my right cylinder it would fire at mid throttle but at high rpms it would do nothing.Okay,went to truck maybey a fouled plug?Ok changed plugs went back out and same thing.Came back, pulled airfillters started ran perfect so I left it running put filters back on with engine running and you could here it kill the cylinder.I adjusted the air screws,went back out for another try and turned her around went to truck and loaded it went home pissed off.Any comments would help thanks guys

 

 

 

 

 

 

 

My mods are 4 mill cub cylinders,hot rods 4 mill crank,v force 3 reeds,boss intakes,.400 billet spacers,35 mm keihn carbs,k&n pod filters,+8 swing arm,slingshot lockup,barnett basket,barnett fibers with hd springs,billet water pump,pro d coolhead,running race fuel.

[majorcr3]

Take a look at your reed block. One might have loosened up but didnt completely come off.

[J-WELDO]

Take a look at your reed block. One might have loosened up but didnt completely come off.

 

Thanks I'll give that a look and if that doesnt work I'd like to see it on the dyno to see what kinda hp she's pullen and let my local builder do some tweeken on the carbs.

 

 

 

 

 

 

 

 

 

[Klaus]

My bike did something similar, it was my float levels. Have you checked them?

[J.J.]

Good fuel supply to the right side carb? might have kinked a hose.