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@Hybrid_Theory01 there could well be some truth in that because Yamaha stopped matching engine/frame numbers on later models and I read that it happened in around 1996 when production of engines and frames were moved to separate factories.
@NINJA Thanks, I have to get the A1 licence now :face_with_tears_of_joy: But the summer will be definitely fun! 😉
@DanRacing Nice work. :thumbs_up_light_skin_tone:
Sounds like you've covered the fueling system, which means it's going to be an electrical component.
You will want to buy a new spark plug, HT Lead and iginition coil to rule out those items.
Next will be the pickup, if that starts to deteriorate then it will start to missfire.
Then unfortunately the CDI. But CDI's rarely fail, but I guess it is 30 years old.