[plumper40d]

it was so brown and dirty i thought i was cleaning the rear fender on a dirt bike but this was coming out of the fuel tank thats been feeding my cvk34mm
on my Ninja 500 ... :?: iam just shocked what do i do to clean this dirty tank .. if i take the gas cap ring off i might be able to get my arm inside
the tank ... :?: i dont know if shaking some fresh gas around is gona do it here ... ..will it hurt if i cleaned it with H.E.A.T. fuel line treatment or soap & water.... and what about the pecock

 

[1Adam12]

Are you sure it wasn't rust and steel swirling around in the tank? Assuming that the tank is rusted I would say look at the Yamaha tank rust remover or Kreem

 

[QKENUF4U]

either YAMAHA's rust remover kit or KREEM kit. both can be bought at the dealer.
you have some TINY arms if you can fit it inside the gas cap hole :shock:
as for the petcock see if you can get a rebuild kit for it or buy a new/used one.