I have a scrambler 400 2 stroke. Just completed a whole engine rebuild and It fired up first time. Was riding on second break in period and it just died, checked and had no spark. so I replaced stator coil and cdi in that order finally got spark with cdi but it still will not start. compression test revealed 141 psi. any suggestions would be great!!

 

Has to have spark,compression, fuel supply and air. You've got two of them covered as 141psi is good compression and you say you have good spark. If you didn't move the stator plate out of time,have the correct cdi,then seems logical to check into the carb,reeds,fuel supply,etc. Plus did you bleed air from the coolant before you ran the machine? Seems like it's something other than just spark if it died on you and now wont crank now that you do have spark again.