CBR 600F4 1999 - 2000 Honda CBR 600F4 Forum

Custom F4 1999 wiring

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Old Aug 7, 2025 | 07:35 AM
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Default Custom F4 1999 wiring

Ok guys, i need some help with my custom build. I started about two years ago with a stock -99 with 34.000 km on it. Building it my own way, stripped down as a fighter/stunt bike. Even though i dont stunt much.... i just like the looks and its my build.
Anyway... started ripping apart everything when i found out all the wiring for dirtbike-style handlebars was too short! Figured i could make my own harness... Stupid idea! Im pretty good at building bikes, but not so great at electrical stuff. And since i have mostly built bikes based on pre modern ignition, anti-theft etc im kind of stuck.

So here is what i did when i recently got back to the process after a year of stand-still.
* Bought a new (used) stock main wiring harness and put in place, plugged in all connectors. All relays are still connected to stock harness (even though i dont need all when using mo.unit, will eliminate later..).
* Stock switch housings are NOT mounted/connected
* Using a Motogadget mo.unit + mo.switch pro to control ignition(power on/off) switching + rear/front + blinker lights, horn, start/stop/kill.
* HISS connected to stock harness. Removed the ring/transmitter from the stok ignition lock, and strip-tied the stock key ro the ring for now. Should be enough for the key/ecu to operate (using bikes stock ecu and key).

I can now control igntion on/off, start and lights from the mo.unit and mo.switch.
Starter will turn, i have lights and and also the stock instrumenst will turn on - and i get a green light on the key.
No start....
Fuel pump did not run. Hot-wired directly to battery to test, and its running/priming fuel. Still no start.
Since the pump is connected to stock harness with stock connector - not working. And still no start after fuel is primed - i suspect it must have something to do with the switch housings? Is there something in there that has to do with grouding that i must sort out?

Unfortunate for me my eyes are getting older....and im having a real hard time to read the printed wiring diagram in low-res A4 format (all black and white).
Need some motiviation to troubleshoot and how to proceed ........ thanks in advance for any help
 
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Old Aug 7, 2025 | 11:27 AM
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marius2050's Avatar
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Just connected the stock right switch housing (kill, start), gave it a litte bit of fuel. No start.... How much fuel will it actually need just to get it fired (not run)? i just filled a couple of "fuelfilters".... so not much.
But at least now i hear the fuel pump starting.
Clutch switch - i dont have the stock clutch lever, but it should start anyway as long as the bike is in neutral right? Or should i jump the wires?

The only wires not connected right now is the clutch switch and fuel level.
 
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