I´ve recently aquired an 89 yamaha riva and am having some issues with it. Primarily the problem was that when the bike was sitting at idle it would consistently die. It then began to be harder to start and currently it won´t fire up at all. I tinkered with the idle nut a bit but that didn´t seem to help. I´m totally new to these scooters and I´m wondering what anyone may think the issue is. Thanks for any help out there, Jason