RICHARDL is not OK.

[RichardL]

I've developed a crankcase-region noise I can't explain. I was at the gas station filling up with the bike at normal idle with normal idle sound. All of a sudden, "ERRRRRR" (kind'a loud), then back to normal. Rode home and tried to get the sound again. It took a while at normal running, then popped in for a little and back to about normal. The first video is the normal running, or at least without the "ERRRRR". the second video is short but captures a bit of the "ERRRRR", but doesn't seem as loud in the video as in person.  At first I thought it must be a dynamo bearing, because it's intermittent and not the clunking I had when I threw a rod bearing years ago.

Anyway, barring some revelation on my part or nail-on-the head diagnosis from one of you folk, I won't make it to the DGR.

https://www.youtube.com/watch?v=cSWm36LmpOc

The sound is about 17 seconds into the following video, and very brief.

https://youtu.be/KmYRtrSCU7k

Any thoughts, maybe in time to fix it tonight. (Not stripping the engine tonight.)

Richard L.

[berger]

first of all I thought rocker starvation , then  I guess at little end, now after hearing second video it sounds like a ball race skidding---- in fact it sounds like my van clutch thrust race

[RichardL]

Berger,

Thanks for checking out the videos.

If you read my post a little while earlier about uneven chain tension, you'll see that A10GF suggested I might have a bent shaft at the gearbox. Maybe that's a bad bearing, as well.

Richard L.

[berger]

I doubt the gearbox mainshaft will have more run out than 5thou{ mine had 3 thou} I thought mine was badly bent when I couldn't adjust my drive chain a long time ago{ mid 80's}. long story short it was a brand new gearbox sprocket causing the problem that had most probably found it's way onto the market from a scrap bin

[RichardL]

I'm going to put a new video up in a few minutes and would appreciate opinions on it, as well. I removed the dynamo belt, so now running without dynamo. Sound may be gone. I noticed some roughness when trying to turn the dynamo shaft by hand. If it turns out to be this. I might be able to fix it tonight or ride without lights.

Richard L.

[RichardL]

Video with dynamo not spinning.

https://youtu.be/wwjsZoSIMKQ

[berger]

somthing sounds dry i'm knackered ,hope you get some answers and solution, 

[berger]

when it does it pull clutch in and see if it shuts up it might be small gearbox ball race gone!

[coater87]

 I dont hear that noise anymore.

 Did you happen to notice if one side of the dyno was too warm?

 I'd snap the lights on and bomb around the block quick, hope the noise is gone buddy!!!

[RichardL]

I think it is the dynamo bearing. The shaft truns pretty rough compared to my barn-find spare. That bike has saved the day 10 times with emergency parts.

Richard L.

[muskrat]

G'day Richard.
If it disappeared after disconnecting the dynamo I'd fly without re connecting it.
Just got home from our run.
Cheers

[RichardL]

By the way, I used the DGR post for the latest on my noise just because I thought that would be looked at right away. Anyway, it is DGR related, really. Feel free to answer noise questions here to keep the topic in order. Sorry.

Richard L.

[RichardL]

Maybe it just doesn't matter. Chicago is showing scattered thunderstorms all day. I don't want to get rained on in tweed and I'm just not experienced enough riding in rain to do it with hundreds of other riders around me. (Probably not the registered 650-ish riders, because many others will probably pass.)

Richard L.

[Greybeard]

Richard; sorry to hear you are having problems. I hope that noise was the dynamo and nothing worse.

[RDfella]

Seems the dynamo is the problem, but have to say that noise wouldn't lead me in that direction. Worn bearings (ball, roller etc) rumble or, if dry, sometimes squeal, but that's more of a scraping sound. Odd.