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400 ex upgrades questions

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I recently got an 07 400ex all stock and just bought a stage 2 hotcam and a keihin flatslide carb...I don't know what year 450r it came off but I had a few questions. I know I'll have to modify the air boot and slide my air box up some but can I use my stock ex throttle cable...and if not will someone tell me why...I haven't even pulled my carb off to look yet...and also will I need to jet it differently or will the stock...assuming they are stock jets...work with my 400ex...after I put the stage 2 hot cam in with it...also will the stage 2 hotcam make it alot harder to start since it does away with the compression release...thank you to any and all who respond

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