2003 yz450

my bike wontstart at all and i did a full carb tuneup all new parts because i thought that was the issue of why it wouldnt start ....could it be the valves that are causing it to not start at all..there is spark,fuel and air

absolutely can be the valves... pretty common to make bikes hard if not impossible to start... sometimes guys can push start them but that wont fix anything...

tat wont even work now i have tried that and nothing...just boggs down

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