I've got a similar problem which could well be the same as yours? Mine has a weak spark, but once it does start, it runs fine. If it ever stops raining i'll gte out and check it and see if its the same cause as yours. Glad you got yours sorted.

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Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Fork Spacer mod / Titax stubby levers /