Topic: more noise than i am comfortable with

[hymodyne]

my 72 cb500 and I have logged over 3000 miles over the last season and a half of riding. I change the oil (Rotella synthetic)  about every 1000 miles. I have had, as I've read, many cb owners do, a clunkiing in my gearbox or lower end at low speeds. riding to work this morning I noticed that the clunking did not go away as it has in the past. what would or could be making that type of noise, and, should I be riding or tearing this engine down?


hym

[eldar]

Is it only in certain gears or at certain rpm? Does the engine vibrate more than it used to?
Just as a check cause you never know, make sure your center stand pulls up tightly. If it is loose, it may clunk.

[hymodyne]

riding this afternon, it was loudest in the first three gears, accompained by a jerking forward as I accelerated. at 60 mph, I still felt it, although not as strongly. cneter stand spring is working fine; thats not the source of the clunking.

hym

[dusterdude]

rear chain adjustment?

[eldar]

Doubt a chain prob but maybe. Might want to drop the oil pan and check things out. See if there are any metal shavings.

[clarkjh]

This might sound crazy but.... are you having any problems top part of the engine/carbs?  It could be there and causing some lash in the gearbox.

Just a little think.

James

[dusterdude]

if the chain and/or sprockets aint right you will get a herky jerky motion

[eldar]

Well the reason I dont think it is those is that it is only lower gears. But loads are different through the gears. You never know sometimes. Still think pan should be dropped though.

[hymodyne]

I'm going to drop the pan and see what's going on down there. lower end on this found bike has not yet been opened...

hym