Oil leaking on spark plug - Kymco 2007 Mongoose 90

Could be a weak spark, since a weak spark will break down under load conditions. Pull the spark plug and make sure their is a fat purple spark. It could also be an air leak between the carb and the intake manifold causing a very weak gas to air ratio, running too lean.

Check oil level capacity, to ensure in specs. Check spark plugs, ensure its clean and correct plug for your quad.the only other could be is ign coil breaking down when warm. Check fire at plug when this happens. First ensure oil level is correct. Make sure your electric fan is on when bike is warmed up.

Have you checked the Spark Plug ? No Spark & No Fuel means not going to start and run. If you are getting fuel then your Spark plug may need to be cleaned or replaced or even re-gaped. Spark plugs have a tendency to get fouled out. Meaning oil gets on it and it can not throw a good spark. If you do have a good spark then check the choke and or the float in the carb.

Thanks for allowing my in-put!

Hey Anon, READ this over and over.. then read it again...
First, decide whether you are going to run an oil pump or not. I would recommend NOT running one if you are going to race this ATV.. properly premixed fuel/oil will never fail.. an oil pump can/will/HAS...
Remove and plug/seal all oil passages to and from the oil pump, seal the oil entrance connection to the cylinder with a good gasket sealer -NOT SILICONE - gasoline breaks it down!!
The only jets in a carburetor that ever need replacing, under normal situations, are the needle jet/jet needle combination-these wear out and are replaced as a set! There is no need to "re-jet" an unmodified engine until you get approx. 1000ft above sea level, then dropping the main jet ONE size usually works..(sometimes only raising the jet needle circlip two notches works if the bike isn't ran wide open for long distances).
NOW - - You decided to remove the oil pump - Drain all the gas out of the tank.. have a QUALIFIED PROFESSIONAL clean and set the carburetor! Run a premix of QUALITY two-cycle oil at 24:1.. this WILL protect your engine under all/racing conditions!! NEVER- -NEVER try to get your engine running cleaner by reducing your oil mixture!!!! Always use the same oil mixture/ratio - spark plugs are much cheaper than pistons!!!! FIND a great two-cycle engine tuner that can "read a spark plug"....It's hard to find a really good two-cycle tuner than can actually "read" a spark plug....
I can tell if your timing is too advanced or too retarded, if your oil mixture is correct,.. if your jetting is correct.. your combustion chamber area is correct,...ALL by looking at your spark plug!!
.... I see amateur "tuners" and guys that call themselves mechanics try to get a two cycle engine running cleaner by reducing the oil mixture - (adjusting the oil/fuel).. and eventually end up frying the engine.. and they can't figure out why>>???
DO NOT mix more than you are going to use each time!!... (use the left over to kill weeds).. DO NOT put it in your vehicles - IT WILL (burning oil) clog your catalytic convert!!
Have you done any modifications to this engine? If so, then you need to find a qualified pro who knows how to read a spark plug and "jet" the engine accordingly.
... Do you live near North Alabama?.. I could help...
..If you are going to race this ATV, please find a good mechanic/tuner that can help...

MY BEST ADVICE - SUSPENSION TUNING will make her go faster than engine mods!!! (the faster it goes.. the better it MUST handle.. make it handle FIRST!!!
Contact any/all of these folks.. ask for their recommendations...(DO NOT overstate her abilities.. this will only hurt!!)
ATV
ATV Suspension Upgrades FOX
DeRisi Racing Inc

rubber side down to go fast!!...

vaccum leak ? hoses cracked at connector. intake manifold leaking ,cracked ?

no oil sensor or shut down ---if carb ok would change spark plug

Hello Anon..
First, I would check to make sure the carbs are getting fuel, and then fuel getting into the cylinders. Your question about low oil - did you let it get low and then it quit? ...
If you put oil into the cylinders and only got 100psi, this might be your problem. You should be pumping around 120+psi without putting anything into the cylinders... Recheck the compression.= .take out all spark plugs...screw the gauge in until the o-ring seats, hold the throttle wide open while spinning the engine over for about 5 seconds... you should get 120psi +/- 10psi.
If you are getting less than 100psi.. it might be time for a rebuild..

The spark plug is on the left side (shifter) of the head,,..?/ this is August.. if the atv has been sitting the carb may need a qualified professional to clean it again.. Replace the spark plug before you squirt anything in the engine...