My 01 yz 426 is super hard to start and was just rebuilt wat should I check

Of course, The neutral safty switch is in series with your starter circuit.. three points: at clutch lever, at kickstand and at the transmission.. Do not bypass any of these switches. Good Luck.

these bikes are the hardest bikes to fix, easiest thing, kick the bike super slow until you piston is at TDC, you will know because it will be hard to kick, then pull the compression release down and as you start to kick release the compression release. NOT an easy task starting a 426 but good luck

it might be under the seat take it off and chech to see if its under it

im pretty sure the 426 has a dipstick on the top of the frame just between the handlebars and the gas tank