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I have seen different claims of horsepower and torque for Liners ranging from 86 to 91. So I did a search for sites with horse power and torque for Liners. Three interesting sites came up.
Motorcycle Cruiser an Internet magazine has had two articles since 2006 indicating 91 horsepower and 117 ft lbs torque at the rear wheel, for a stock bike.
http://www.motorcyclecruiser.com/roadtests/2006_yamaha_star_roadliner/index.html
Rider magazine has article indicating 87.1 horsepower and 107.2 ft lbs torque, at the rear wheel stock.
http://www.ridermagazine.com/output.cfm?id=1202131
The most interesting site from Pacific coast Star shows Dyno charts for most Star bikes. Two runs, one stock and one after some modifications. They don't say what modifications. Stock Liners being 86.86 horsepower and 112.63 ft lbs torque. After modifications, 95.73 Horsepower, and 118.86 ft lbs torque.
http://www.pacificcoaststar.com/pcs/yamaha_dynos.htm
Dave
Motorcycle Cruiser an Internet magazine has had two articles since 2006 indicating 91 horsepower and 117 ft lbs torque at the rear wheel, for a stock bike.
http://www.motorcyclecruiser.com/roadtests/2006_yamaha_star_roadliner/index.html
Rider magazine has article indicating 87.1 horsepower and 107.2 ft lbs torque, at the rear wheel stock.
http://www.ridermagazine.com/output.cfm?id=1202131
The most interesting site from Pacific coast Star shows Dyno charts for most Star bikes. Two runs, one stock and one after some modifications. They don't say what modifications. Stock Liners being 86.86 horsepower and 112.63 ft lbs torque. After modifications, 95.73 Horsepower, and 118.86 ft lbs torque.
http://www.pacificcoaststar.com/pcs/yamaha_dynos.htm
Dave