Question about 2002 Honda CRF 450 R

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Petrol getting into my engine oil crf 450 2007

Petrol is getting into my engne oil . checked valve clearances and they are fine . been leaving fuel tap on when not in use

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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

Posted on Jun 23, 2009

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How many hours has the engine done? Whats the compression like? Souns like piston rings to me.

Posted on Sep 21, 2009

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1 Answer

Incorrect valve clearances


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.

Dec 29, 2013 | 2005 Hyundai Atos

1 Answer

I can't get my 06 crf 250 to kick start but it


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.

Apr 12, 2012 | 2006 Honda CRF 250 R

2 Answers

Not getting gas in the carb. changed pump. poured a littlr gas in the carb good compression but dies when gas runs out


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

Aug 16, 2011 | 1986 Dodge Ram 50

1 Answer

04 crf 450 starts hard most times we have to push start it but after that it starts fairly easy.


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.

Aug 31, 2010 | 2005 Honda CRF 450 R

1 Answer

Gas is spitting out the exhaust when I try to start the mower. If it does come on it doesn't stay on long.Can anyone help me solve my problem ?????


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

might pay to fit in line fuel tap too

have a look and let me know what you found

cheers paul

Aug 10, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Mower blowing white then black smoke & running rough


if unit is ohv engine - i gather unit is using oil ?

may have a blown head gasket and air filter may be oil / petrol soaked
restrcting air flow

check oil level is correct ( and does not smell of petrol ) wet sumped and breather is working ( not stuck closed )

check for tight valve clearance

if all these are ok then might suspect worn rings / bore ?


may need further info on engine model - type

let me know and i will try help more if can

cheers

Aug 08, 2010 | Garden

1 Answer

2005 honda crf150f


i dont think its rev box.(rev box just keeps engine from reving over a certain rpm) could be bad gas or water in gas, also have you checked those valve clearances lately?? 0.003--0.004 on filler gage

May 15, 2010 | 2003 Honda CRF 150 F

1 Answer

2005 honda crf150f


check valve clearances

Mar 27, 2010 | 2003 Honda CRF 150 F

2 Answers

05 crf 450r stalls out once it warms up


Think about the valves. If they are to tight (Valve clearance) with the heat added when warm, they (Or one) might not close. I'd check there first.

Jun 28, 2009 | 2005 Honda CRF 450 R

1 Answer

Petrol is getting into my engine oil on my crf 450 2007 . checked valve clearences and they are fine .


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

Jun 22, 2009 | 2002 Honda CRF 450 R

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