I have a 2000 400ex that I ended up with (long story).. It was rebuilt by previous guy right before I took it on a trade deal.. I have video of it running and the day I picked it up it fired and idled for minute or so.. Didn’t want to run it to long being no airbox on it.. Get it home and now can’t get it to run..

I finally did today get it to start for brief second and than it died and hasn’t started since.. Pulled the plug in wire 10 x and always shows good spark when I check it, plug is wet from fuel, pulled carb and it will shoot fuel if you hit throttle, ran and grabbed a good compression checker and showed 180psi with throttle open on cold motor..

I am at a complete loss here.. Only thing is I don’t have a NGK plug in it.. Parts store didn’t have one so cross referenced to a Autolight plug.. Grabbed can of starting fluid to see if that would boost it any.. No luck..

Thanks