You should double check for air/vacuum leaks and use the recommended fuel. The stte of tune of these engines makes them relatively impervious to fuel octane levels. The more likely cause is a problem in the induction system/tract.
First, welcome to the BurgmanUSA forums Ken. Glad to have you join us.NebraskaKen said:I've recently purchased a 2005 Burgman 400 and it has a very lean condition at idle and at 3,000 RPM under a light throttle. The dealer has been in contact with Suzuki, but no solutions seem to be available.
I was hoping that the FI system would be all but trouble free, but now I'm longing for the good old days of adjustable carbs.
I've been on other Burgman forums, and this is not an isolated complaint.