Strange Noise ??

[Lucky_Lou]

Went for a spin yesterday when i got back there was a strange metallic "screechish" noise on tick over i switched the engine off got the video and recorded the engine noise.
When i restarted it wasn't nearly as bad but you can still hear something in the background so your collective wisdom required...brownie point for anyone who nails it. There's a odd Low drone from the air box as well but its always done that.
Don't be fooled by the sunshine its only just above freezing but i was going stir crazy and had to take Gertie out.
Lou
http://www.youtube.com/watch?v=f196ox-e9FQ
Ok i feel a tappet reset coming soon but thats not the noise thats bugging me

[Barry]

I can hear the engine breather valve gobbling a little but that's nothing unusual.  The screeching sound is very brief and harder to pick up. Does it do it with the clutch pulled in ?

Lou was lucky.

I woke up to 2-3" of snow on Sunday morning. Just as well that I got my ride in on Saturday then.

[JDS]

its morse code something about too Cold and Oil.

[Bob_Roller]

I would agree, that the crankcase breather is the cause of the 'gobbling' sound .

The screech, and this is just a guess, could be the timing chain not getting tensioned by the piston that is activated by the lubrication system, due to cold thick oil not getting to it quickly enough to tighten it properly .

Does the 'screech' go away after the engine gets a bit warm ?

[Lucky_Lou]

I would agree, that the crankcase breather is the cause of the 'gobbling' sound .

The screech, and this is just a guess, could be the timing chain not getting tensioned by the piston that is activated by the lubrication system, due to cold thick oil not getting to it quickly enough to tighten it properly .

Does the 'screech' go away after the engine gets a bit warm ?

Bob the screech wasn't noticeable when i set off cold or when i stopped at Squires for a coffee only when i got back home with the engine fully warmed up after 30 or so miles !!
If i get chance ill fire it up tomorrow at the workshop and have another listen cold.
Thanks Lou

[Bob_Roller]

We had a member here post about a screech, the thread ended without any final source of the noise, about 8 month's ago  .

I'm not computer savvy enough to get the posting to this thread .

I did a search for 'screech' all categories, and all posts, and it came up as the third posting, right after this thread .

Dry points cam was one possible source, and a few other suggestions .

[Barry]

Dry points cam was one possible source

This is certainly possible as our points don't have a felt lubricating pad like older Airheads.

[Lucky_Lou]

Tried a cold start this morning sounded as sweet as a nut ??

http://www.youtube.com/watch?v=VbbcqL-FPSs

I wont get chance to have a run out untill next week now so ill make sure i take the camera with me in case it does it again.....the first video has only a faint "noise" on it was very noticeable when i pulled up, i wish i had left the motor running while i went to get the camera now.
No doubt it will resurface if its anything serious ill keep you posted.
Lou

[the_admiral]

hi lou my 65 used to start screeching after about 5 mins from starting,it was the timing chain.82000 and sweet as a nut now.

[nhmaf]

I'm not sure but I would also tend to suspect might be the timing chain tensioner.   I'd not tear into it yet, but do see if you can get the sound to repeat itself, perhaps under a bit warmer conditions.   She might just be complaining a bit with the cold.   Vehicles tend to make all sorts fo different sounds when the mercury drops sufficiently, and they aren't all "death sounds".    My cars, truck, and especially diesel tractor sound like they're about to fall apart when they're first started up on some of our chillier mornings (-30F or -30C, it doesn't matter as the scales tend to converge around there) !!

[Bob_Roller]

A mechanic's stethoscope may aid in locating the source of the noise, if it can be duplicated while the bike is stationary .

[Ed Miller]

And if you don't have the stethascope, a long screwdriver or socket extension can be used.  Touch one end to the area you're investigating, and hang on the the other end pretty tightly and press your thumb knuckle into your ear.  You'll hear all sorts of weird stuff, mostly tappets.

[montmil]

Lou, and other doctor wannabes...

You out-of-town cats may not be able to pop over to your local Harbor Freight but for dirt ball cheap, the HF Mechanics Stethoscope works very well. There's a thin metal diaphragm inside the "lump" at the tube connection. This drum skin r-e-a-l-l-y amps up the volume.

My worn out timing chain guides were talkin' to me. Plus, you're less apt to burn your face on the exhaust pipe!

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=41966

Monte

[Ed Miller]

I have one of those, Monte, now.  It's almost too loud, and if you have the ear pieces in, don't rub that tip against anything.  The amplification works really well.

[stubmw]

Old thread I know, but there didn't seem to be a conclusion.
 I just had a similar noise, although the YouTube video is no longer there to confirm that. A very small dab of moly white grease on the points cam instantly cured it for me. I don't believe there is a felt pad on the 79/80 bean can set up.