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well you cant damage it by doing that but if you put too much n and didnt shake it well it will settle at the bottom of the fuel tank and fill the carburettor up with oil as oil is heavier than petrol.why are you not using the oil tank and oil pump fitted to the bike ?best thing to do is put a new spark plug in it turn the fuel tap off roci the bike bacwards and firwards to mix the oil and fuel in the tank,and drain the carburettor by undoing the 14mm nut in the centre of the bottom of the carb,then turn the fuel back on and try and start it up.
For a motorcycle engine to run you need compression, ignition (spark) and fuel. Quite often with a bike like a Suzuki if the plugs get even a little wet but otherwise look like great plugs, the motorcycle will not start. So, new plugs are a good place to start, however if you put in new plugs and try to start a few times and have fuel but no spark the new plugs may become unable to start also.
FIRST check to see it you have spark at the spark plugs, then remove the plugs and either do a compression test with a gauge OR put a finger over the plug hole and turn it over and if you have adequate compression the engine will blow your finger off of the hole when it comes up on the compression stroke.
If you have a carburetted bike you can check for fuel by taking off the air filter and operating the throttle a few times full open in which case the accelerator pump should eject a spray of fuel into the carburetor throat. With Carb or Fuel Injection you could also spray some fuel into the carb throat or the induction module throat while turning the engine over with spark at the plugs. If you have spark and compression but no fuel th eengine will fire when you spray the fuel into it.
Check the fuel tap is turned on and that the fuel filter is clean. If this is all good, you should check that fuel is getting into the fuel reservoir on the carb. If no fuel is getting through, your fuel pump may have failed. But, as you don't say the make and model of your bike, I can't be sure.
spark plugs are deep in the head yet you should get all the the old fuel out first, stale fuel wont ignite and will also clogg fuel filter. you need a mix of atleast 70% new fuel even then its not good for the injecters. If its a manual gearbox a tow start is a quick fix although no go for auto's. cant be much wrong if car was fine when parked, plugs-fuel-filter and possibly fuel pump for sure. If that doesnt fix take plug out put in lead and crank engine to be sure you have spark even just put any plug you know works in lead leaving your plugs in engine just to check for spark y turning over engine looking for spark on plug good spark will be blue but any spark is good.
if you have good blue spark and it fires when fuel is added externally , then the problem is fuel flow through the carby
have the carby professionally overhauled or get a new carby
make sure that the gasket to the manifold / head is in good condition
Have you checked the spark at the spark plugs?
How this is done is take a spare spark plug that is known to be good. Pull the spark plug boot off and install the spare plug in the boot and lay it on part of the engine to get a ground. Know try and start the bike and see if there is any spark coming from the spare plug. Do this to every plug and remember to put the cap back on the plug after you test that plug. If there is spark then that rule out ignition. Now check out the fuel delivery. You say you have a couple gallons of gas in the tank. That's good!
1st check the petcock and make sure that it is not plugged buy removing the fuel line and putting it on PRI setting. This means Priming the carbs or injectors with gas. If that is OK put the line back on and check the fuel filter witch should be under the gas tank and see if it is plugged. 2nd check the fuel pump to see if it is working. How to test this is remove the fuel line from the pump that goes to the carb or injector and turn the bike on but do not try to start. The pump should squirt gas out as you turn the key on. If it checks out OK then it has to be something with the carbs/injectors. Just got to try a process of aliamation. Just remember Air-Fuel-Spark=Bang. Hope this helps out. Please let me know how it works out.
pull one plug wire insert screw driver intothe spark plug boot getthe screw driver 1/4 inch away from a good ground and where it won't move. crank engine over if yo see a blue spark then you have another problem if it does nor spark yo have a bad coil or contact set.
Check the carb diaphrams for any tears/pinholes? (They are on the top of the carbs) Have you reconnected the breather from the tank? Is fuel getting past fuel tap? Sometimes the vent in the fuel cap can get blocked with crud and create a vacuum which stops fuel flowing.