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90kph, sure. 90mph? Not possible.
 

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At 90mph, your engine is running between 5600 and 6300 rpm. 2001-2004 VL800s used a dual fire ignition, meaning both coils fired at the same time. From 2005 on, the C50 uses a single fire ignition, meaning only the cylinder at TDC of the compression stroke is firing. If your tach is only showing 3k rpm, then you have the wrong tach on the bike. That is expecting a dual fire ignition, but only reading single fire - which is HALF of what the engine is turning in RPM. Sorry to burst your bubble.
 

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At 90mph, your engine is running between 5600 and 6300 rpm. 2001-2004 VL800s used a dual fire ignition, meaning both coils fired at the same time. From 2005 on, the C50 uses a single fire ignition, meaning only the cylinder at TDC of the compression stroke is firing. If your tach is only showing 3k rpm, then you have the wrong tach on the bike. That is expecting a dual fire ignition, but only reading single fire - which is HALF of what the engine is turning in RPM. Sorry to burst your bubble.
I guess it's possible, but the engine doesn't sound like it's struggling or at higher RPM's. Definitely sounds right for the rev range, and jumps up to 6 or 7k rpms when full throttle is given. I'm leaning towards something else was modified in the drivetrain.
 

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Nobody modified the drivetrain. This little engine doesn't have the gonads to turn 3k RPM at 90mph. Sorry. You're actually running it up close to its redline of 7250rpm.
 

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LOL. Sure it does. We all have the same bike. You're at the end of WOT at 90 my friend. You cannot change the laws of physics.
 
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