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DRZ400sm engine noise (hear me out)

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I know y'all have probably read thousands of drz engine noise complains, but this one is different. I just bought the bike, a 07 drz400sm with 9k miles, and this is my first drz. Likewise, it struck me how noisy the engine was. There is an annoying ticking that I assume is the cam chain and I plan on buying an mcct soon, but that is not the issue. It seems that in the mid rpm range, especially in low 2nd gear (because of low ambient noise) there is an almost siren like noise coming from the engine, pulsing. It's hard to tell what it its, but it gets louder and much more noticeable after the engine is nice and warm. I'll try to post an audio sample as soon as I can. Also, the pulsing seems to speed up with an increase of speed and doesn't pulse but rather stays constant while revving in neutral. It's noticeable when in neutral as well as other grears and throughout the rpms, but is especially noticeable while holding constant rpm. (The sound is not there during deceleration) Could this be the cam chain? I'm very new to the drz and I'm not sure if there is something that I should take care of before it locks up on me or if I'm just being paranoid. With the limited amount of info you have, tell me if you know what it could be. Thanks.

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The cam chain will only make excessive noise if it's loose due to stretching and to know if that's the case the cam timing must be checked and the chain replaced if so.The auto decomp can also be a source of noise at idle,it runs off the exhaust cam. 

The other noise while the bike is being ridden could be an excessively loose drive chain rubbing against one of the chain rollers off the frame.They wear out after a while.

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