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You'll have a crank-case vent pipe going into your air box. This allows any combustion gasses that make it past the piston rings to escape from the crankcase and be recirculated through the carb...

Thank you, I'll try up jetting then.

I'm in the UK, it's a Euro 3 spec bike. I'll try to remember to post speeds in both mph and kph for an international audience.

Incidentally, this is the first vehicle I've ever had with an...

Thanks for the suggestions. Yup, I'll try a short run with the air filter out completely and see if it helps. It's a weird arrangement, where the air filter is on a pod on the side, feeds through a...

Ahoy the forum. I've got an EU spec 2009 Lifan LF250B, a copy of the Yahama Virago, with the 2V49FMM engine.
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