I have a 2006 yzf250 and it seized up at 65 mph, no oil, i was able to turn it over later, how do i fix it?

i added oil, checked valve clearences, checked timing, got 65psi compression, all gears work, kicks over nice, got fuel, ignition system has correct voltage, spark plug good, but wont start! i tried pop starting it on a hill with an without choke but it still wont start!!!!! help please!!I have a 2006 yzf250 and it seized up at 65 mph, no oil, i was able to turn it over later, how do i fix it?
65 psi compression is pretty low, a healthy engine would be more than twice that. Time for a rebuild as the others have said.I have a 2006 yzf250 and it seized up at 65 mph, no oil, i was able to turn it over later, how do i fix it?
This is a dry sump engine - holds oil outside the engine, there is no 'pan', there is no 'low oil pressure switch'.





What you do have is an engine built to extremely tight tolerance, that absolutely requires oil for cooling and lubrication.





Running without oil, even for a few minutes, will cause all bearing surfaces to overheat, and metal to metal contact areas to expand then seize.





You should have at least 100 psi cranking pressure, if not more, but compression is the least of your worries. Race engines that have experienced catastrophic oil failure have more junk parts inside than good parts.





At minimum you'll need to replace the following: Cam and bearings, valves, piston, cylinder (or have it replated), rod assembly (or new crankshaft), main bearings, some transmission bearings, maybe some tranny gears, oil pump.





If you don't have any experience checking out parts to see what's good, you'll need to take it to a good mechanic for evaluation. If even one worn part is missed, it can cause the engine to fail again.





At this point, the engine is a very nice paperweight. I'm sorry, but there is no way that just adding oil and adjusting the valves (no way to adjust the timing, so I'm not sure what you did there) will get this bike running again.
guaranteed if it seized up due to low oil pressure or no oil then it now has no compression. The fix is engine rebuild. Main bearings, crank, rod, piston, rings, sleeve and oil pump would be items I would pay close attention to and also look at the oil pan screen while you are at it. Had a friend of mines Virago 1100 seize up tighter than a drum while we were riding bikes on vacation 600 miles away from home. Oil pan screen was covered in filter debris and metal shavings. Oil pump burned up and seized engine. Rebuilt a Honda with a bad oil pump bearing. Important to keep a check on the pan screen if at all possible. Most newer bikes since 99 have a easy way to do this. Most pre 99 required tearing the cases apart on Jap bikes.
If you ran out of oil then there is no easy fix. I'm surprised u can even get it to turn over. what you have is an oil pump failure. with no oil pressure the oil pressure cut off switch turned the engine off. find out where your oil went then fix that. from there you might be able to salvage your engine
You are going to have to have it bored out and sleeved then probably a new piston , rings rods , bearings and crankshaft .