My yz 250f just died on me in the air an will not start I can push the kick start down with my hand seems like the top end is blown I'm not sure any ideas

Sounds like the motor is seized.No oil is gonna fix that. Top end job may be in order

Check that the arrow on the top of the piston is facing the exhaust. Sounds to me like you have it in backwards.

Sounds like it is running out of fuel adjust float in carb. Possible electrical connection problem with spark from coil check all wiring make sure pet **** has flow constantly of fuel.

Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

if the bike push starts, i assume it runs good,
if the kick does not turn motor over, there is a spring clip that engages the kick gear that may be broken or misplaced
if the kick start turns the motor over, you have to use decomp to get just past TDC then kick

check the compression with a compression tester. you may have burnt the ring out on the piston. if you don't have a compression tested you should buy one and test is right but if you remove the spark plug and stick your finger over the hole while you push the kick starter down it should force fully push your finger off. if so you have compression if not then you don't have compression and need to redue the top end.

if you have compression check for spark by taking the plug while it is still out and plug it back into the wire and rest the tip of the spark plug or side of it on the head and push the kick starter again. you should see the spark plug spark at the tip. if so it's good and if not you may have a bad coil or something in the ignition system.

but check that and et me know and i can further assist you.

turn the idle screw in and check the setting on the air fuel mixture screw. is the bike all stock?

• If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
• If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
• While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.

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