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post #11 of 85 Old 07-24-2011, 12:57 PM
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I have a rattle as well - it's in the top end. but it's not as annoying (maybe it's me). I can make it happen sitting still in neutral, so it's not drive train. Went by the dealer to pick up a filter yesterday (HONDA - put spin-on filters on EVERYTHING!!) and I had their chief mechanic listen to it. He agreed it's there, but said he had no bulletins on it or any indication that it was a problem.

Every engine (except inline sixes, or so I'm told) has various rpm levels where harmonic imbalances occur. Good balancer design can eliminate most of the problem, but it still occurs - watch the front forks and the mirror of the next Harley that's idling beside you at a stoplight.

Is it a design issue or detrimental to the engine? Don't know. One of the risks you take when you buy a new model, I guess. Not going to let it bother me, would rather go riding. I know it's in vogue to distrust and hate big companies, but Honda has a pretty good track record of taking care of it's customers - one of the reasons I like to "ride red" (even if mine is black).

Let's hope it's just a thumper harmonic...

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post #12 of 85 Old 07-25-2011, 08:05 AM
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Originally Posted by Luke View Post
I have a rattle as well
Mine is getting a little worst, and seems it's moving higher on rpms.
First was there at exactly 5500rpm, now up to 6000, in basically every gear.
It feels to me like something not fixed properly that starts vibrating, even if it is not worrying me so much: I read it is common.
Must be said that I didn't lube the chain yet, at 400 km.
After doing so I will check again and report.
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post #13 of 85 Old 07-29-2011, 01:58 PM
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I notice the rattle on mine at 40miles now my bike is just over 200miles its in every gear and at RPM's over 5500 thru 6000. I going to visit the dealer tomorrow just to get the issue on the books and ask if it's a problem. I've only have the bike a week and hope it's not damaging anything.
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post #14 of 85 Old 07-29-2011, 03:01 PM
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I guess i got lucky..i have noticed no rattle at no rpm, high or low..just had first service done yesterday...only rattle i have is when i go over a railroad crossing or something of that nature..sounds like a metal plate or something jiggling in the front fairing somewhere....nothing im concerned about or annoyed with
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post #15 of 85 Old 07-29-2011, 11:20 PM
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I guess I'm super lucky... so far, no rattles of any kind, in any conditions.

2011 Black CBR250r
2006 Silver Alloy Nissan 350z
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post #16 of 85 Old 07-30-2011, 06:32 AM Thread Starter
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Ordered a Yosh slip on exhaust. Im hopeing it drowns out the noisey motor
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post #17 of 85 Old 07-30-2011, 06:41 AM
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yall should be wearing earplugs on the bike anyway. i cant imagine going back to riding without them.
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post #18 of 85 Old 07-30-2011, 01:46 PM
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today i was looking at this graph
and i think i spotted something interesting.
lot's of people complain about rattle between 5500 to 6000 rpm.
but if you look at this dyno graph you will notice that between 5500 and 6000 rpm the torque i rapidly increasing.
maybe the same process which makes the torque rapidly increase is doing the rattle noise?

sorry about my bad English
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post #19 of 85 Old 07-30-2011, 07:19 PM
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Hmm, that's very interesting. I still have my head all open (waiting for shims to arrive Tuesday), and have checked everything out top to bottom. Besides there being side-side play on the rocker arms, there is also play on the shaft holding the rocker arms in place and the cap that secures it in the head. There are rub marks on the caps too. Basically, besides these 2 things, everything is solid. There is no scoring, mechanical damage, etc. It might just be a design issue and we'll have to invest in earplugs.
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post #20 of 85 Old 07-30-2011, 10:02 PM
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no rattle for me neither and i love the bike so much fun
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