| Definitely not carb icing. The rear cylinder cuts out completely then cuts back in like it's losing its spark, but the HT lead shows a nice fat spark when the bike's running.
Haven't cleaned the carbs yet (no bleedin time!) but will do so after this weekend. Was just wondering if this is a common problem with a well known source (coil/relay/etc)?
JP: Not exactly but it wasn't really smooth on starting either.
Cheers,
Ali | 
Threaded Mode