chain and sprockets trouble

hi all im wondering if any other cb500 owner is having the same problem as I am with chain and sprockets
after fitting a another new set of chain and sprockets with in 3 months of the last set .my chain and sprockets have worn out again ie im getting that annoying crunching and grinding sound from the front sprocket as I have checked and replaced rear wheel bearings both sides and sprocket bearing and yes it has got the spacer between the sprocket and the wheel so its not that ! and I have checked its in line with the front sprocket
but im finding that the front sprocket is the problem end ,had the front checked and been told its fine but was agreed there is a problem but im unable to find the solution any ideas ? thank garry

My chain kit does the clickety-clack-sound too when i move the bike about by hand.

Without eg photos of the components, I find it hard to judge how much badness you're experiencing compared to the only reference I can get to atm - me.

Several factors may be relevant.

Chain kit quality. In general, non-O-ring-chains and soft iron sprockets are to be avoided.
Maintenance. your chain is made from approx 500 parts, it sits out in the open and needs maintenance.
Use. 3 months, yes. But are you an everyday or casual rider. Motorway or town mostly. Just to give an impression.
Knowledge. You're asking for it. I'm trying to answer as best I can.

So:
Tell us about your chain kit.
How you service it.
A hint on your riding pattern.

And by all means; pictures. Of sprocket teeth and the chain itself.

My initial guess would be inadequate quality and maintenance. I have battered my chain kit for 20.000 miles and there's nowt wrong with it. Bloody expensive it was, but my dealer wouldn't sell me anything less. Today, I know why. Proper dealer...

Hmm... Try to grab your chain at the back of the rear sprocket, right next to the adjuster. Pull back and note how much you can 'lift' the chain off the sprocket teeth. Then tell us that too, it will help gauging chain stretch.

I've had mine on the CB500 for 13 months and the chain has only needed one small adjustment in that time, having been used for about 12,000 miles.

One mistake I did make with my CBF125 was to over adjust it, which actually makes the chain stretch significantly more rapidly than it should.

I have the same problem, even though I use top grade chain and sprockets.
If you only notice it when you are pulling away at low revs, there is a good chance that it is the bearing behind the front sprocket and not the sprocket at all. I have looked into it and found that the bearing can't be replaced without the shaft which works out expensive, at £273+vat,  the CBF suffers the same problem too.
This is probably due to it using the same bearing. (And being a twin) Fours don't seem to have this issue as their power strokes are more evenly spaced, and more frequent.
I have just got used to it, annoying as it is.
Using the OE front sprocket with the rubber attached seems to quieten it a little.
My last chain lasted about 60k, I do keep it well oiled with a scottoiler.

my chain and sprockets have worn out again ie im getting that annoying crunching and grinding sound from the front sprocket...

As Andy said, that sound doesn't always mean that your chain/sprockets are work out.

It is well worth doing the test that Stormbringer advised - pulling the chain off the rear sprocket to see how worn it is.

If you want another test then you can measure the chain pitch using a ruler and compare it to the pitch in the manual; this is more annoying to do.

I think it would be quite hard to wear out a chain/sprocket in 3 months unless something is very wrong....

I have been getting between 20 and 30 k  from the CB500 chains (I had 5! )

Noisy front sprockets is common if the chain is run too tight or without enough lub

I  if I remember swap the front sprocket after 10k
I only use Jt sprockets and DID x ring chain

All bike have had a scotoiler and get extra spray lub in bad weather

Have you checked the wheel alignment? There should be an equal amount of adjustment on each side. If its out the sprockets may be damaging the chain and vice versa.

Could it be a worn cush drive?