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Grindy/buzz noise coming from crank case I think

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Hello all

So my 99 Dr350se got a new noise the other day and hoping someone else may have had a similar issue  

at around 4900-5200 rpm there is a buzzing like grindiing sound coming from the left side of the bike. I think we have narrowed it down to the crankcase. 

It happens regardless of speed or gear that I am in. It also seems to happen more often as it decellerates but it does happen on the way up sometimes too. 

Oil is good and nothing is obviously loose that i have found yet. Chain has also recently been lubed. 

 

Any help is appreciated 

Thanks,

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