1990 Yamaha FZR 600 will not start

SOURCE: 1994 yamaha fzr 600 spark plugs foul after about

Really...strange what you need to do is see if the bike is running too fat. So...warm her up witha fresh set of NGK! spark plugs. After the bike is warm take it down the street and back. When your on the way back get on the throttle and accelerate then shut er down and coast it into the garage. This will give an acuurate read on the spark plugs at operating temperature and under a load. Pull all the plugs. If they are brown like coffee with cream that means carbs are adjusted correctly. If they are black and wet too rich and if they are white or very light brown too lean. Other problems may be oil soaked plugs from loose top end parts. Maybe valves or guides.

SOURCE: bike won't start 92 yamaha fzr 600

Sounds like the plugs are fouled out, I would pull them and make sure they're about the color of a paper bag. If they're all sooty and wet you most likely have a rich condition. I would take the carbs out and clean everything and pop in a new set of plugs. I have a 87 Fz600 that was acting up until I cleaned the carbs.

SOURCE: very hard to start 1991 yamaha fzr 600,

Check the choke to make sure its operating correctly.

SOURCE: where is the reserve switch for the 1994 yamaha

LH just below fuel tank

SOURCE: my yamaha fzr 1000 genesis wont start no spark any

check the side stand relay>>>