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I have just purchased a 2008 Burgman 400 with only 427 miles on it. The wife never rode it and the guy got tired of it being in the garage. I hear a loud, deep frequency squeal or howl as I accelerate from a stop. It's of a very short duration and I think it stops when I feel the "drive system" fully engaged after a couple of seconds or so. It doesn't make the noise on the center stand when I slightly rev the engine nor with the rear brake on. Can someone guess what this may be ? .....serious, or not ? Thanks.
 

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Your clutch bell is glazed up and your cvt is probably filled with belt dust and needs to be cleaned out as well.
 

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Yeah, it is probably the clutch shoes slipping on the clutch bell under load. You can find quite a few references to it in the 07+ 400 section. Doesn't appear to be a performance issue just an annoyance.
 

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Mine was doing that too a little bit when I bough it to the shop, so I'll see what they say when they call. My bet= "There's nothing wrong with it".
Anyway, it's nothing that will hurt it.
 

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it's normal and annoying, probably why it didn't get ridden, the hold the brake and de glaze the clutch pads thing seems to be the best answer and just keep doing it as the noise comes back, there is a different type clutch bell out there I plan to try when I get my next bike that may end that problem as it is physically shaped different and should cause the harmonics to be altered , instead of a solid bell it has holes , lots of them for heat control reduced dust retention inside the bell , and like a water glass that you run your finger around the top. I think it might also stop the moan, one of our members here is running it now.
 

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Mine does it and has since I have had it. When I take off, I take off at full throttle to get the clutch to lock up as quickly as possible. I found that after it gets warmed up, the noise usually goes away. I also found that it seems to be weather dependent and I suspect it is due to the humidity level. I also found that it does it more when the bike isn't ridden frequently. Just run the heck out of it and don't worry about it.
 

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If you really cant do with it take the transmition cover off remove the clutch bell
clean out any dust and give the running surface a bit of a rub with fine emery
paper, take the clutch it's self off' it's held by the same nut, clean the shoes
and file a bit of a chamfer on the leading edge of each shoe, wile its off re grease
the bearings in the clutch unite, wile this is not 100% sure to fix it you
at least know it's good for another 14000 miles or so, there are some really
good videos of how to and if you have not done one before have a look at them first,
also for reasons I don't understand the clutch always seems to work better if
the scooter is parked on the side stand maybe the dust settles to one side.
 

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^^^ That's odd and the 1st I've heard of the side stand, but I use the center stand most times and mine is bad, real bad, like sometimes it can slip and grab terribly at times, just embarrassing!
 

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Mine was doing that too a little bit when I bough it to the shop, so I'll see what they say when they call. My bet= "There's nothing wrong with it".
Anyway, it's nothing that will hurt it.
Picked up my bike from the dealer, the problem? "There's nothing wrong with it". So they cleaned and scuffed up my clutches at no charge and it seems pretty smooth, so I guess if it stays smooth for a little while I'll be happy.
 

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I had this problem, but just cleaning the dust out seemed to fix it for me.
 
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