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Old 07-05-2008, 05:16 PM   #1 (permalink)
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6th-Gen wiring help for Bonneville race bike.

I am building a race bike for Bonneville and am using a 2002 VFR engine. I haven't been able to get it to run, so I'm looking for some help on the technical side of things.

I have a wiring harness from a non-ABS bike, but the ECM says "ABS-GF20", which I assume is for an ABS bike. I looked at the schematic in my Haynes manual, and the wiring looks the same, except for the area that concerns the brakes. I made a custom frame, so the only VFR part of the bike is the engine. I crossed the side-stand switch wires to make the ECM think the side-stand is up all the time. I did the same thing to the clutch switch. I also bypassed the bank angle sensor & the engine stop relay.

I don't have a dash, so those wires end at the plug for the dash. I am using an after-market fuel pump, which is wired seperately from the main wiring. I checked to make sure the cam pulse generator & the ignition pulse generator are not grounded, per the Haynes manual. Power on, bike in neutral. Cranks but has no spark. I check the coils & I have 12 volts at the coils. This is a USA bike, so it shouldn't have the HISS immobiliser to worry about. On page 5-5 of the Haynes manual, it says that I should have 12 volts at the white/red wire & the black/white wire on the grey ECM plug. The b/w wire has 12 volts, but there is no w/r wire on the USA model. I compare the USA model (page 9-25) to the Europe model (9-24) & it looks like the pink wire is the same. At the pink wire, I am getting only 7.8 volts. Per the wiring diagram, it looks like there should be 12 volts to the pink wire when the ingition is off and nothing when the ignition is on. So I clip the pink wire & still no spark. I jumped 12 volts to the pink wire & it still won't spark. I have an original ignition switch with a key, but I used a different throttle & kill switch. I wired up the kill switch the same way as the wiring diagram, so that all seems right. When I turn on the ignition, the key switch has 40k ohms of resistance between the pink wire & any of the other 3 wires.

I am stumped as to why I don't have any spark.
I went to the local Honda dealer but they don't want to touch it.

Any help would be appreciated.



Matt


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