Buzzing Noise form motor durning cold starts Need help

I have a 2000 XR650R and durning cold starts I notice a buzzing sound from the oil pump or water pump side of the bike and after a few miniutes it goes away just wondering if anyone else has run into this , and this is the only peep I have heard out of this machine ever, and this is about the third time I have heard it.

I have a 2000 XR650R and durning cold starts I notice a buzzing sound from the oil pump or water pump side of the bike and after a few miniutes it goes away just wondering if anyone else has run into this , and this is the only peep I have heard out of this machine ever, and this is about the third time I have heard it.

Are you running 20/50? Try running 10/40. My XR600 used to do the same thing. I think that when its cold and the oil is thick it will be forced thru the little bypass valve (not thru the filter element. The buzzing sound is that little valve opening and closing.

thanks I will give that a try before I brake her open , But wouldn't all my buddies BRPs do that with 20-50 or is the oil bypass becoming weak

I've never heard a sound like that from mine, I run 20/50 synthetic..

:lol::confused:

Mine does it too.

The noise comes from the oil pump when the engine/oil is cold but no problem with that!

my 2000 and my buddys 2001 do it at cold start ups.I have a scotts filter and he has a paper . we both run 20/50...

Mine does it as well at start up, and goes away after it warms up...

I've always associated it either with the oil pump, or the cam chain having very little oil on it. Either way, its fine, I wouldn't worry about it...

Mine does it too, Since day one When I first bought Mine. I thought I was starting up a diesel engine until I got used to it, the more noise the faster it runs hehehehehe

My '03 just started doing it after the last oil change, not sure what it is. I just allow it to warm up past the noise, and all seems well. at least I hope....

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