Question about 2005 Yamaha WR 450 F

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HELP HELP HELP! PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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  • Anonymous Apr 15, 2009

    same issue, could the cam gears be 180 degrees out with the crank shaft ?

  • Dave Hansen May 11, 2010

    Did you or someone else replace the head gasket?
    The reason I ask is that I can help you, but I will need for you to answer a series of assembly step that were made.
    The first one I have is: Was the #1 cylinder at TDC?
    #2: Were the cams installed with the small marks lined up with the head and facing outwards?
    Once we know this, then we can go from there...
    Let me know..


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Do yourself a favor > > purchase a factory service manual. I am not being flip when I say this. It sounds like someone has been into the engine and done who knows what. Ignition timing is simple enough but what if the prior owner messed with the overhead cam chain? OHV timing could be way off. Are the carburetors in sync and balanced? The manual should walk you through the service proceedures and settings. The manual costs a lot less than the repair shop but if you don't have the proper tools and knowledge of engine repair this engine is not one to just tinker with.

Posted on Mar 11, 2009

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I have losened all the head bolts and don't want to break anything trying to get the head off. It is one ther real good and not sure how to remove it!

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1 Answer

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May 30, 2009 | 2005 Yamaha WR 450 F

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Engine oil

Since you are asking this you do not have a manual or been able to locate the stamping on the outer engine(clutch)cover. I would call your selling dealer and ask the service department shop foreman. There may be a service bulletin or trick to get all the oil out of the engine/frame(if they still run through it like the 426 did) and the oil strainer as well as the oil filter. If you are wanting to just top it off, you might as well change it. It is a race bike intended for very frequent oil changes to insure the clutch and engine/valve train are adequately lubricated. If memory serves me correctly, you are to check the oil after running it for a moment. Call the service department. If they wont talk to you then you either did not buy your bike from them or you should buy your next one somewhere else.Since I take it you bought it used or you would have been instructed on all this as well as supplied a manual, I would buy a manual. I know all this because until 2003 my job was delivering units to new customers and explaining in specific detail how to start/operate/ and maintain the specific machine purchased. Unfortunately not all dealers employ someone to do this.

Nov 10, 2008 | 2005 Yamaha WR 450 F

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