My 2002  250 txt Pro has a weird problem that is driving me mad ! 
The engine will start & run normally, but after a short period - (within 30 minutes) the engine will die and will not fire again for several hours ! 
There no spluttering or misfire - its like its run out of fuel, but it hasn't. 
So far I've: 
Cleaned carb  & filters. 
Carb float needle does not appear to stick 
No air leaks around read valve block etc  
replaced the kill switch 
checked  spark   - seems  O.K. 
Could it be the the Crank seal on the flywheel side ? 
Can us fit these without splitting the crank ? 
I am arranging to borrow an ignition to rule that out. 
Anyone had similar problems? 
Thanks  in advance