Intermittent backfire

[Shooter560]

Started the bike up today and it developed an intermittent backfire/pop through the exhaust. Tracked it down to the front cylinder on the right. Tried changing the plug 3 times, but it’s still there, pulled cap and pop stopped but obviously running on 5.

Any suggestions as I’m at a loss, and starting to think it’s either a lead or maybe an igniter breaking down

[ct1500]

Is this present at an idle and higher RPM? I would first do a compression test on the engine. Sounds like a misfire is occurring where an adjacent plug leads spark is jumping to your #1 lead. What was the spark plugs tip condition and for that side of engine white, black and compared to the left side? How well is the engine running otherwise?

[minimac]

Could also be a sticky valve.

[Shooter560]

Well after a day of pottering, tracing and head scratching I finally sorted it, one of the wires to the top igniter pickup had started to break causing the issue, why it was only affecting cyl 1 I have no idea, but wire cut and soldered and miss fire/pop has gone, it even revs smoother too, so maybe it’s been playing up a while

[TwoTone Trike]

Glad you got it figured out.