Re: Engine stop at 9500rpm
98/99 have no fuel pump, and no pressure regulator.
There is a vacuum tap on the tank and gravity feed to the carbs. The only filter iirc is in the tap where it fits into the tank and can be removed and cleaned (care not to dump fuel everywhere!). What emissions control is on the bike? Its not something we have in the UK, but was there EVAP or some such on these bikes (I have no idea if this could effect anything).
There is a breather on the tank too and if that were blocked or restricted in some way it could make a difference so worth checking all the pipes right through from the tank to the carbs inc all breather hoses, like I said above, and that fuel flows freely from the tank when the tap has a vacuum.