2001 Mojave 250 will please will someone help me

[Jaiidutch]

ok so ill try and make this as short as i can i really hope someone here can help me figure this out...
bought a 2001 Mojave 250 from some one not running.. was running till ??somthing?? happend. was told before it stopped running it had a timing chain slap sound so the chain was replaced.
got the quad home and did a compression test results were 0psi...lol decided to break the engine down n see whats going on. found a brand new timing chain installed and yet 2 valves pushed into the head..so i ordered a top end gasket set and all new valves and lapped them in. while the head was off i did a broke man leak down and filled the cylinder with thin oil and let it sit for a few days and none of it leaked so i assume the rings are good. reinstalled the head with new head gasket and valves. re did a compression test and I'm seeing 80psi(i don't really trust my cheap tester). I kick start the quad over and it will run for about 10 seconds and then die. I'm getting good blue spark. cleaned the carb and tried again... i can kick 10 times and it will only start for 10 seconds or so. swapped my carb, throttle cable & thumb throttle from my 87 Honda 250x to the Mojave and same result 10 seconds... had a friend bring over a known good working Mojave carb and you guessed it same results 10 seconds. even swapped to a back up stator that i have and same thing... what in the world is going on! i dont know what els to try

[davefrombc]

Did you check the fuel line to the carb for restrictions? It may be the float bowl isn't  filling fast enough.

[Jaiidutch]

i put on a new fuel line sorry forgot to add that in the original post

 

[Mech]

If you have a timing light connect it and watch it to see if the spark dies before the engine stops rotating. Or, fit another sparkplug on the lead,and then rest the body of that sparkplug against the plug in the engine. If you have a good strong spark it will go through both plugs and you will be able to see the spark die on the test plug. Try it in a dark place.