Topic: whining sound cb400

[kajtek]

ever since ive owned it my bikes has made quite an unpleasent whining sound.

its barely there when i start it and gets worse as the engine warms up.

to describe it... it kindof reminds me of a car in reverse..

doesnt happen in neutral, only with gears enganged, and doesnt have to be moving so hold the brake and pull the clutch out a bit and you get the noise.

any ideas? or is this a trait of the bike? seems to me from moving my head around that its coming from the stator side of the crank..

thanks

ashley

[-CB-Jamie-]

Have you tensioned your drive chain too much? that can cause a whining noise.

[smashedmelon]

this is a shot in the dark, but I had a whining noise issue that ended up being my tach cable needing some lube.

[kajtek]

Drive chain correctly tensioned and no tach cable... Basically it only makes the noise under load, any other suggestions?

Thanks

Ashley

[HondaMan]

The whine on my bike turned out to be my ex-wife. It has been gone a long time, now. 

[seanbarney41]

...just got done working on a buddie's cb400, made the same noise on test rides, I don't know what it is but I found it mildly pleasing

[Kevin400F]

Just a guess....bad bearing on the primary shaft.

Kevin

[number13]

"The whine on my bike turned out to be my ex-wife. It has been gone a long time, now. "

http://instantrimshot.com/

[kajtek]

Just a guess....bad bearing on the primary shaft.


Kevin

That's kinda what I was thinking but hoping not!!!

[camelman]

You might be able to locate the whine with the old screwdriver trick. Stick a screwdriver handle to you ear and the other end to various parts of the engine, and you'll hear local noises.

Canelman

[sopo400f]

The screwdriver trick might work if he has a side car:P

I have the exact same issue, only whines underload.

[dadeo]

Hi, im just wondering if you ever figured out this problem? Im having similar trouble.

[camelman]

I've noticed this on the few 400Fs I've had. I just thought it was normal. The exhaust on the 400 is pretty quiet, so you might hear more engine noise than on other SOHC4s.