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Re: petrol getting into my engine oil crf 450 2007
Your carb float valve is not adjusted correctly you have to take the bottom off carb and where the needle valve is the tab that holds it in needs to be bent toward the needle a touch careful not to go to far or it will not allow gas in just a toch
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Raw petrol means no combustion in the cylinders or fuel is flooded. Check the spark plugs and ignition spark first. Noise in the cylinder head could mean engine knocking due to oversupply of fuel or unburnt fuel causing higher pressure in cylinder.
the same thing happened to me its probably your valve clearance and need to be shimmed or if they worn really bad they need to be replaced..regarding roll starting your bike it damages your bike further and your engine could seize.
get a oil can the thumb operated type and squirt some oil down the petrol pipe and make sure pipe is upwards so the oil runs into the pump then leave for a while to wet the valves in the pump then crank engine to make sure petrol comes up or just refit the pipe and pour some petrol down the carb and watch it go
crf honda's run titanium valves which wear out very quickly if valve clearances not checked very regularly. what happens is the valve wears on its sealing face and clearances close up and then valve rides and looses compression,much like a leaking tap. bike will make more compression and valves will try to seal when warm. i probably rebuild one of these bikes a week with this problem. get it to your dealer and have clearances done. you can get stainless steel valve conversion kits which are much cheaper than honda titanium valves.
sounds like the engine has wet sumped and is extremly full of diluted oil / petrol
does your oil smell like petrol and is very thin if wet sump indicated
remove tank and carb , clean tank, clean carby and replace fuel needle and seat - check float for hole reset fuel level and reassemble , adjust governor , drain and refill engine oil and replace air filter and plug, , check valve clearance and reset iff need
Make sure that you turn your fuel to the off position when you leave your bike sitting for more than a day. Gas will sometimes leave the tank, and pass through your carb, and into your cylinder. It will then bypass your rings and seep into your oil. Dosen't happen overnight, but after about a week i becomes common if your float is sticking. Good Luck.22