Question about 2002 Honda CRF 450 R

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

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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

Posted on Jun 23, 2009


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Hi i have yamah xt 600e 1990 year i want to ask you how many litters oil i have to put for the motor .how can i check the level of the oil and i have one more question how can i check the backlash of the...

hi this engine when dry takes 2.8 litres of oil,20w40. if you mean valve clearences you will have to remove the covers on top of the valves to gain access to the cam folowers, with the engine set at tdc using a feeler gauge check the clearence, the inlet should measure 0.05-0.10mm when cold in inches 2-4 tho
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1 Answer

My 04 crf 450 is leaking oil out of the air box breather

Hi, Jmattison21 and the usual suspects are:
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3. Engine breather hose bent, pinched, kinked etc.
4. Air filter has too much "pre-oil".
5. Crankshaft seal failure allowing transmission fluid to migrate.
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For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Engine Oil leaking out of my CRF 450 air Box
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Honda CRF450X 2005 Service Manual
OEM parts for Yamaha
Honda CRF450R Owner Manual

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1 Answer

My 93 swb mitsubishi pajero 3000 v6 petrol snaped a cambelt would this have done engine damage or do these motors have enough valve clearence etc

I believe this engine is with interference, therefore valve damage is possible. To check if it is with interference, remove all of the spark plugs, carefully and gently, by hand, rotate over the crank, if it contacts a valve (do this carefully) well.... then you have your answer. I'd then replace the belt with proper timing and do a compression check. If a valve went bad, you know quickly.

I hope this may have helped and I we'll keep our fingers crossed for you,

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2 Answers

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

Jun 22, 2009 | 2002 Honda CRF 450 R

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Back firing usually indicates a timing problem.

Apr 30, 2009 | 2002 Honda CRF 450 R

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2005 Honda crf450x cold starting

doulbe check the grounds, & you might need to add and extra ground wire to the bike, closer to the starter. This should help. There is a valve that release the compression when you kick it off.You might see if you can pull this release the compression valve while pushing the start button????

Feb 07, 2009 | 2005 Honda CRF 450 X

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