My 2008 Suzuki rm z 250 4 stroke locked up the other day and u couldn't kick it or nothing it finally knocked loose started up and everything and now its smoking bad from the pipe and motor where the header on the exhaust connects any solutions to why it would be doing this

sounds like you have a lower rod bearing failure,and ya that would cause it not to be able to kick start

keep it in power band remember

good luck.

If you are running 5th gear mid throttle the compression in the motor wasnt enough to push the piston back down

for the record ( i run a ts 250 savage 2 stroke ) i,ve done it my self it happends

try to keep it the power band you will be fine

good luck.

Remove the spark plug, put the bike in fourth or fifth gear then try a jump start but with the key turned off. If the rear wheel locks up when you jump on and release the clutch then the piston has probably seized up OR the kick start-to-clutch hub gearing is messed up. The best thing to do is to remove the left engine side cover and look at the kick start mechanism. You may need to remove the clutch assembly for a full inspection. With the clutch removed the rotor ( crankshaft flywheel ) should turn. If it will not turn then a seized piston, broken cam chain or dropped valve is likely. If the rotor does turn then the kick start mechanism is the problem. Please rate my answer. Thanks!

Sounds normal to me. Keep the choke on slightly until it warms up...As little as needed to
keep it running

Sounds like fuel restriction causing lean mixture. Look for debris in carb float bowl and jets .

sounds to me like shes nipped up in the bore possibly to a broken ring or lack of oil or coolant unfortunately the damage is done you will have to remove the cylinder head & barrell to determine how much check the oil pump for blockage & function was there adequate oil in the tank alsowas the coolant resevior full at the least it will need a set of rings & the cylinder honed at worst big end bearings if the bottom ends locked up this involves splitting the cases so for your sake I hope my initial diagnoses is corrrect

Drain the fuel and refill it with the correct ratio fuel, it may take a few kicks, but it should start. Cleaning the plugs would not go astray either.

4 stroke engines require a leaner than normal fuel/air mixture to start when hot. The cold start choke allows more fuel into the mix. The hot start choke allows more air into the mix.