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The only thing that comes to mind, as you say " is very loud when you wind it on". Check to make sure the carby is connected to the air box, air filter properly, this loud noise you are hearing is probley air intake leak. check your air filter system. I have never heard of such problems, ' it's
started vibrating and been very loud every time i wind it on.' Coming from removing and cleaning out a carby? Just look things over carefully, you will spot the problem im sure. Good luck
It sounds like:
1) One of the wires that takes power to the right hand turn signals is shorted to the chassis.
2) One, or both, of the right hand turn signal bulbs is burnt out.
3) The turn signal switch has failed.
Initially, have the battery externally charged and/or load tested. This is just to verify its current output capacity not just the voltage.
Offhand, the "...loud buzzing sound..." indicates that the starter relay is cycling on/off on a fast rate. This could only be brought about by the supply voltage going up & down. Possibilities then are:
loose, corroded battery terminals / connectors & other electricals including the engine and frame ground straps.(most likely);
The loud whining noise is just normal for vfr 400 because it is gear driven cam.. As you reach 5000rpm up, the bike's electrics try to misfire the plugs so it would act as a speed limiter (180kph).. You have to bypass the sensor at the speedo..
Do check if not drain and refill the gear box, but check with your dealer that it will not affect your warranty. a little self help may prevent time consuming and inconvenient repairs at this stage, but remember gears are clunky and come in for a lot of abuse, reliable as they are.