I recently bought an 82 XS650 bobber, it isles awesome, has a pile of bottom end, however I think it is making out around 50-55 mph... I believe the rear sprocket is 36. Front is 17. Filters are clean. Does anyone know what might be causing this? The bike runs awesome, and idles better than I expected so I don’t believe it is a carb issue, and the motor seems to be smooth as freshly flooded ice so I am at a loss....