2010 BMW R1200GS Review

This year marks the 30th anniversary of BMW’s R1200GS and R1200GS Adventure – two bikes that have dominated a niche and carried the weight of BMW Motorcycles on their broad backs. At the heart has always been the Flat-Twin engine design – opposing jugs that became a symbol of the marque and have adapted outside of the GS line to the sporting world. Tuning secrets learned here were transferred back to the Adventure machines, and the Bavarians elected to infuse the proven Boxer Twin with technology from their HP2 Sport.

New cylinder heads are the targeted area with each featuring four larger valves – the intakes are oversized 8.4% to 39mm and the sodium-filled exhaust valves increase by 6.6% to 33mm. Appropriately matching pistons form the new combustion chamber, though the compression ratio inside the 101 x 73mm bore/stroke sleeve remains unchanged at 12.0:1. A larger throttle manifold and revised air intake also contribute to what BMW claims is a higher rev ceiling of 8500 rpm and a 5% boost in horsepower to a claimed 110 hp and 88 lb-ft of torque. An electronic exhaust flap and new muffler internals promote the Boxer thump.

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Source [Motorcycle USA]