Misfire when rolling on the throttle.

[Gnasher]

Good to see you’re still on here Gnasher.

I'm still about mate 

We have a sonicator here at work which cleaned a completely blocked pilot jet last time around. I might just take them all out this time and run them through the machine.

It's usaly the pilot jet/s or the air bleed channel in the carb body that block, you can also just get main jet as well or in stean of.  The sonicator will sort them all out if it's big enough to take the whole carb body, unblocking is only half the battle you need to sort out why!