Fisrt off, congrats!! Great bike, I am a huge fan of the 400cc Japanese bikes ESPECIALLY the VFR400R and the RVF400R, I have ammassed a huge amount of info, sales brochures etc etc.
The single headlight is an aftermarket thing it is NOT road production, rvf400r's all had the twin fox eye, there were no road bikes with the single headlight.
When owning an rvf400 many will compare to the vfr400, I have a list of differences between the two, I hope it helps;
The differences between a VFR400(NC30) and a RVF400(NC35) are;
- obviously different body work, the RVF400 copies it's bigger brother the RVF750 RC45
- The VFR has 32mm carbs vs 30mm carbs on RVF, but RVF has 'T' section vacuum piston as opposed to round section piston, this makes piston lighter and offers more throttle response
- The RVF has tuned ram tubes to increase mid range power
- The RVF has increased camshaft timing, same lift but more duration and overlap
- Intake port/valve seat on the RVF is 19mm as opposed to 20mm on VFR
- The frame on the RVF is substantially different to the VFR, RVF clamps the motor in a different position and has more rigid mounting points, it is also a later generation frame design
- The steering head angle of the RVF is 25degrees as opposed to VFR's 25deg 20 minutes, which will give slightly faster steering
- The wheel base of the RVF is 10mm shorter than VFR
- The trail of the RVF is 92mm as opposed to 96mm of VFR
- The handle bars of RVF are 10mm higher and 24mm close to rider which will give a more comfortable ride(moreupright)
- The fuel tank of RVF is 30mm wider at the rear
- The front fairing was wind tested with naca ducts feeding cool air to air box(not ram air), 6.5% improvement in aerodynamics over VFR
- Front forks of upside down design, with revised spring rate and dampening, stiffer dampening and spring over VFR
- Rear shock on RVF has integral compression canister, also has revised shock linkage and improved dampening and spring rate
- Front calipers are of more rigid design, with about 10% improvement in feel over VFR
- Rims are slightly lighter
- Rear rim is 17inch an RVF, VFR runs 18inch
- Rear single sided swing arm is different in it's mounting to frame to reduce weight and increase rigidity
- RVF has revised gear ratios 1 thru 3, they are slightly wider than VFR 1 thru 3, first gear is also shorter, giving about 10km/h less in 1st gear, which is good due to very tall first gear of VFR400
-revised front sprocket/rear sprocket gearing giving a slightly greater top speed over the VFR400.
I dynoed one about a year ago, it had an aftermarket slip on muffler, I was disappointed with the out put, I thought it would get higher, but it sure did sound sweet.