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Fcr cracked slide

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Hi

 

I’m not sure if this has been posted before but I bought a fcr mx and I am running stock header, slip on, 3x3 I have 160main jet, 45 pilot and EMN needle 3rd down I’m at sea level, when the throttle is fully open runs fine when I hold the throttle slightly open steadily the bike splutters and jumps, I turned the fuel screw all the way in and the bike runs better so down sized the pilot to a 40 but still has screw turned in all the way and idles better, if I take the air box cover off runs a bit better any thoughts?

 

Also I noticed that the slide on the engine side has a crack in it, could this have anything to do with it?

 

TIA

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Replace the cracked vacuum release plate. If it breaks more, the engine will ingest it and you will have serious problems. And yes, a damaged part in the carb can cause running issues/

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