After a new chain the gear box/engine tone has changed

I've had a new chain put on today and it now sounds like the gear box is
under a lot of load. Anything above 3,000rpm is resulting in noise a
bit like a car in reverse and doing 70mph results in a lot more high
pitched noise. Similar revs with the clutch in and the bike sounds like
previously riding at 6,000rpm.

Other than that, feels the same.

Is it common to have a (significant) change in tone with a chain change?
I figure a new chain might be tighter.

Tim B

 

Check the chain tension whilst sitting on the bike ... should be at
least 30mm displacement or thereabouts. Any less and you're loading
the cush drive and the output shaft bearings, with potential wallet-
lightening consequences.

Paul.

 

Your chain is too tight.

 

Tim B formulated the question :

Did you check/fit new sprockets?

 

Hmm, more succint then my response.

I'm reminded of my school report "In the aim for brevity, you lose
sense"

Bloody English teachers, what do they know ...

Paul.

 

Yup.

 

Chain tension seems fine, plenty of play and even all around. It was a
mobile guy and he brought sprockets for a CBF600 instead of a CBF500.
He's coming back tomorrow to fit the sprockets.

Went out on it again, with less traffic and without ear plugs. I must
have the worse helmet for wind noise, but through the wind roar and
without ear plugs the sound seems pretty constant and loud at certain
speeds regardless of the gear at 20, 35 & 50mph. So possibly a sprocket
issue. With ear plugs in, sounds like gears working overtime.

I'll see what tomorrow brings. But wanted to know if a new chain could
cause sound issues when I talk to the guy.

Thanks,

Tim B

 

Or badly aligned.

 

A new chain with shagged sprockets = trouble

 

Goes without saying. I've only ever had one chain replaced by a "mechanic"
that didn't need re-aligning.


--
Beav

VN 750
Zed 1000
OMF# 19

 

New sprockets fitted today. A significant improvement on the noise.
It's now consistent with the speed of the chain (stays the same pitch
regardless of having the clutch in or out), quieter, but still wasn't
there previously. My guess is chains make a noise and this is a
different chain and therefore has a different noise. The old one was
probably cheap and O ring type, this is a DID X ring type.

Tim B

 

If you have run the new chain on the old sprockets, it's probably fucked.

 

For one day? Bollocks. And we don't even know if the sprockets were
fucked or replaced, as so often is the case these days, 'just in
case'.

 

The old sprockets were new too, just the wrong size. If they were for a
wider pitch chain, they may have fucked it a bit I guess. It'd be worth
having a close look at the side plates to see if they've been splayed a
smidgen.

 

Ignore me, I misremembered what the op said. Damn Asda & their cheap
wine.

 

Might be worth checking if the 500 & 600 use the same size chain. If
not, & he originally brought 600 sprockets, chances are it's a 600
chain too, & therefore too big for the sprockets.

 

"Life's too short for cheap wine"

Paul.