1988 Yamaha FZR 750 short circuit

Try and find some iridium plugs or other high performance plugs. Sounds like the plugs you are using just dont agree with the motor's performance output

use a vom/ meter on current setting put in circuit ..take hot off battery attach one lead to bat + the other lead to heavy cable u just disconnected. but 1st charge bat to full. see current draw. start to pull one fuse at a time till current drops. that circuit is the culprit. then youll need to find out why is drawing w/ bike off. wire chafed ? minor short.. or when running meter on battery 14.5 volts not running 12.5 volts if the vovtages don't go up when running regulator or altinator is bad or bat wire .. get the manual.. a big help...

One or more cells are short circuited resulting a loss of voltage. The voltage is not enough for the bike to function properly. Only one solution: change battery.

This is an ignition problem, (probability of short circuit in the ignition head wiring). U may have to repair this.

tx.