Pull your spark plugs and clean them or replace them. I have had that issue with mine. Clean plugs curred it. I also found that the plug boots will allow water in the tubes as well. I put a little bit of grease on the plug boots and they fit in the tubes better, no more troubles
Think water is the issue. However, now I have had the upgraded plug caps fitted, the issue has, touch wood, gone away. Suggest anyone having the same issue gets a set fitted. Bikes back on full song and the weather in the UK is getting dry !!!
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