I’ve seen those symptoms too on a mates BMW F650, so Rotax single motor fed by a pair of Mikuni CV carbs.
It turned out one of the diaphragms had split on the edge where it folded over.
On that bike it was relatively easy to get to them and pop them open to look inside so I would take Slobs’ advice and swap the ignitor boxes first as that doesn’t involve removing the tank and airbox to get to the carbs.
Quote:
Originally Posted by Darkness
I’d try that first too as it’s probably more likely to be ignition unless we are seeing the start of ethanol related rubber issues?
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I’m a little surprised that we haven’t seen it on diaphragms already to be honest as I have to regularly replace the rubber inlet manifold from the Amal carb on my little race despite my best efforts to use Ethanol free fuel.