YES IT WILL RUN , LIKE THAT,, My 800 would stammer so bad it would blow the muffler off ...LOSt a lot of religion over that one . i would not rule out timed cam,,,BUT DONT GO THERE YET , my bet is that the pump is out of time ,,I Know You Have Wore yourself Out ,,my 800 , gave me the same fitz , took it to my b-i-l , he figured out the timing issue . HOPEFULLY you have a good hearted knowledgeable tech at the pump shop that will talk with you and walkyou thru this ..YOUR 400 will RUN LIKE A DREAM , rite now IT IS A NITEMARE ..stop washing it down with ether,.. my 800 luves the stuff now, after the headaches we went thru ..
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