Burgman 400

[sendler]

If you really want to get the engine running right with the new exhaust you will need a piggyback fuel controller.
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Bazzaz for Suzuki Burgman
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And a dyno session to tune the mixture at the tail pipe. Or the additional wide band O2 sensor mixture mapper.
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Accessories : Z-AFM Accessories
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Maximum fuel economy looks like you will want to set the weights to cruise at (or below) 5,000 rpm. Maximum acceleration and horsepower peak is from 7,000 to red line but I can't really see needing to tune the pulling rpm's that high with 40 hp on tap.

[beatr911]

He's doing very good at 75mpg if that is really what he is getting. My '06 Burgman 400 gets right about 64mpg at 60-65mph (65-70 indicated). This is over at least 15 tanks of fuel on my 48 mile each way commute.

I have 21g Dr. Pulley sliders, an old belt, a tall Clearview windshield, de-restricted airbox with WAI, loose valves, .035" plug gap with back cut ground strap, tires inflated to sidewall max.

Exhaust is stock, but peering inside the exhaust it glows dark orange after riding. It's a common occurence on these bikes and possibly indicates a new exhaust is in my near future.

Any advice on a low restriction and quiet exhaust?

[stiletto2]

Originally Posted by beatr911

He's doing very good at 75mpg if that is really what he is getting. My '06 Burgman 400 gets right about 64mpg at 60-65mph (65-70 indicated). This is over at least 15 tanks of fuel on my 48 mile each way commute.

I have 21g Dr. Pulley sliders, an old belt, a tall Clearview windshield, de-restricted airbox with WAI, loose valves, .035" plug gap with back cut ground strap, tires inflated to sidewall max.

Exhaust is stock, but peering inside the exhaust it glows dark orange after riding. It's a common occurrence on these bikes and possibly indicates a new exhaust is in my near future.

Any advice on a low restriction and quiet exhaust?

Not sure if the 400 Burgman is anything like the Honda Reflex exhaust wise. The exhaust restriction on the Reflex has to do with getting the temperature up and working the catalytic component in the muffler. These engines are air pumps of sorts. Move more air through, and more fuel is required. Some engines like the 249cc engine of the Reflex seem to be designed/tuned for certain amounts of power at relatively low fuel flow rates. Tweaking for more HP by de-restricting things generally means more fuel will get used. Sure, the Reflex uses a carburetor, but I believe this to be true even with FI engines. Some have tried using less restrictive exhaust systems, but also needed to do jetting changes as well so that they would run..."properly". (and that = more fuel use)