[Triple Jim]

The engine makes 45 lb-ft of torque. This is at the crankshaft. If you're seeing a dyno run that was made in 4th gear, the torque measured was adjusted to crankshaft torque by taking into account the transmission ratio, primary drive ratio, and final drive ratios. Dyno torque values are normally adjusted to crankshaft torque, or it would be meaningless to compare torque values of different motorcycles when trying to describe the engine characteristics.

The primary gear ratio is 1.925, so the available torque going into the transmission is 45x1.925=86.625 lb-ft. The final drive ratio (sprockets) is 2.688, so if the transmission were in a 1:1 gear, the overall torque at the rear wheel would be 86.625x2.688=233 lb-ft.

Since 6th gear's ratio is .964, in that gear, the torque at the rear wheel is 233x.964=224.lb-ft. If you were to use 1st gear, you get 2.9 times the mechanical advantage that you have in 6th, so the available rear wheel torque becomes 651 lb-ft, resulting in a possible driving force of 580 lbs at the rear tire. As you said, there are significant losses, so that number when actually measured may be more like 500 lbs, and this is in 1st gear, of course.

This checks out when you consider that the motorcycle and rider probably weigh around 600 lbs. The resulting maximum acceleration would then be about 5/6 of a g, which is near the limit of tire spin, and about like you'll experience in 1st gear on an FZ-07.