I was just wondering if you guys might be able to help with my problem.
When i'm accelerating hard in third... and sometimes 4th, i hear this clanning/ flapping/ indescribeable noise. when i ease off the gas it quieten's
down and when i;m cruising u can't hear it. any idea what it is? i thought it might be a loose plate or someting under the gear stick ( its has a
short empi ) ... but i have no clue.. i doubt its serious .. was just curious - its detdracting from the great sound of the motor 
What fuel are you using,how much advanced is the spark,is the engine pinging? Does the noise diminish when you ease the throttle? Or does the noise sound like it is in the tunnel? These are a few easy questions to ask yourself and eliminate them one by one,obviously we can't be sure as we haven't experienced the noise. But it does sound like preignition.
Preignition is your motor destroying itself
Get your motor tuned yesterday
what vehicle and engine type CM ??
is it getting worse by the week?
only when mtr cold??
Is it gear stick bush making the shift rod rattle. Can be a harsh noise, does it go away when you put load on the stick while its happening?
as per above try a few things hold the gear stick as see if noise still there
do you know what a pinging noise from the engine is ???
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. as soon as i put a little pressre on the
stick in a certain direction is stops
you just need to replace the shift rod bushing
Thanks dude! .. can it wait another 2000 miles til next service?
As you say you have just had it serviced and it was running fine it probably can if you can put up with the noise or accelerate more lightly.I would still have the other factors checked as well.
it's not that bad .. i can live with it its due for a major service
next time so i'll get it seen to. with my motorbicycle out of action i'm sure clocking up the miles fast in the o;d beast