Why leipai 4 wheeler will crank but won't start not sure why it will not catch?

Hey, take your battery to a battery shop and have the CCA (Cold Cranking Amps) checked... you might find out the problem...

is battery at full charge? is it able to handle the crank power required have battery load tested.
Is it getting fuel?

Hi Jasper:
Have you tried jump starting from another vehicle?
It may be that your battery is just not putting out enough amps.
RV and motorcycle batteries tend to not last as long as car batteries.

You might consider how long it has been sitting. How long has the battery been off a charger? Batteries need to cycle...sitting for months of non-use will drain enough charge out of them that they don't have enough cranking power..sometimes they will never regain a charge and need to be replaced....a Jump should work here. It is possible the Carburetor is gummed up? Assuming Carb model not fuel injected...Take off the air filter and spray some carb cleaner in the intake to see it if will turn over. If fuel injected model, you may add some fuel injector cleaner to gas tank (read the label on proper use)...You might have to flush the fuel line and add new fuel if it has been sitting for a year or more.

Low voltage getting to the starter. Bad connections,battery or starter brushes.

Could be your starter, solenoid, or even a fuel pump/clogged lines or filters

spark, fuel and compression.

check battery u may need a jump or the oil is too cold and 4 wheeler needs to sit in a warm place for a hr or 2

got a 150cc marchin atv but it ran 3 or 4 times then it quit working it makes a nois like its about to crank but it aint workin and body out there who can give me any solutions

it needs a set of rings and maybe a piston then it will be like new again