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Underseat Projects

7/9/2023

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As I complete the finishing details on Project 39, my 1993 VFR750, there's several tasks to finalize before covering the area under the tail fairing and seat. In this photo we can see some of these jobs completed — there's an aftermarket Mosfet regulator/rectifier installed, battery tender leads attached, relocated starter solenoid, chopped passenger peg bracket and new brake fluid reservoir.
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Mosfet R/R — Replacing your OEM R/R is a reliability upgrade. Mine came from RoadsterCycle and I chose the "Super Mosfet Kit" which is complete, over-engineered and a tight fit; about $180. The flimsy OEM wiring is replaced with more substantial gauge and requires soldering or crimping to the three stator wires. The new R/R has its own positive and negative leads which connect directly to the battery. As supplied, the battery leads are unnecessarily long which I shortened for neater underseat routing, but not really necessary. The OEM positive/negative leads are no longer used so I simply repurposed them for battery tender leads which cross over and exit out the bottom of the left-side fairing.

​In the photos below you can how I routed the battery leads so that I could still use the battery cover. The negative wire simply runs under the cover and out the rear while the positive sneaks out a slot cut into the front of the cover. That red box is the built-in circuit breaker — I put a tie-wrap around the flip-open lid as an extra bit of security. There's two exposed lugs under the cover which would cause electrical chaos if accidentally grounded. You can see the large black wire behind the battery which takes these leads to the R/R.

Also in this photo is my new battery hold-down strap. Mine was missing in action and NLA from Honda, and in my search for a replacement most of what I found were cheap, generic, too-long straps which reviewers reported to last only a few months. I finally found these in a 2-pack on Amazon which fit perfectly.

The second photo shows where I needed to grind the upper portions of the R/R fins for fairing clearance. The upper mounting screw is simply a large sheet metal screw while the lower is the original threaded mounting stud. The Mosfet is larger than the OEM R/R and a tight fit, but it does fit if angled just right.
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Starter Solenoid — My replacement shock absorber, a Honda 929 item, has a large reservoir chamber on top, which was pushing against the starter solenoid and not allowing the battery to drop into place. The solenoid is attached to the battery box via a metal bracket spot-welded in place. Looking at the wiring, I realized that the solenoid could be relocated to the right side of the battery box if I could move its bracket.

(Below) With the battery box on the workbench, I drilled out the welds, pried off the bracket, found its new location and pop riveted it in place. Reinstalled in the frame, the solenoid fits happily in its new location.
(click on an image to enlarge)

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Footpeg surgery — I'm eliminating both passenger footpeg assemblies on this project, but I still need the fairing mounting points, so I performed some major bracket surgery, saving only the needed piece. You can see the finished bracket in the lead photo.

​I do have spare brackets in the event a future owner would like to return the bike to stock. ​

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The left side passenger bracket was likewise modified — cut, smoothed and polished. I left the seat/helmet lock and handle in place, although my lock was MIA and I haven't been able to locate one, so the lock is simply by-passed for now.


(Below) Here's the finished right side with the original rubber shield in place, ready to button up.

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