90base Posted March 17, 2017 Share Posted March 17, 2017 I just bought an 86 VFR as my first bike for $750. This thing is rough! The plastics look like crap, it's been spray painted, it's missing some rear lights and the turn Signals are steady instead of flashing. I knew there were a few wiring problems when I bought it, but wiring comes fairly easy for me. Bbuuutttt, you hit the button and it starts right up and purrs, plus runs down the road great (short of a small flat spot in the REV range). I decided to remove the seat and have a look at the wiring situation, and it's screwed. Lol. I did manage to get the brake light to work. But In the process, I messed up another wire somewhere. Now the tach doesn't work and the bike only runs on full choke. If you give it any throttle it dies. I'm assuming I didn't plug all the plugs for the cdi back in, causing the tach to not work, (I'm guessing the fuel pump isn't working either.) I'll get to that tomorrow. I could repair this harness but it seems easier to just replace it.... If I can find one. I have a lead on a wiring harness from an 87. Although the seller is listing it as 86-87 vfr700 wiring harness. From what I have read online the cdi plugs and cam sensors are different. Do they share a wiring harness, or are they indeed different? Thanks Brandon Link to comment Share on other sites More sharing options...
TheDutchy Posted March 17, 2017 Share Posted March 17, 2017 Wiring harnes is different. '86 models have an extra pick-up on the cam that is wired seperately to the CDI. Also there is a seperate Yellow/Green wire coming from the CDI box. This wire is responsible for the tach signal and triggering the fuel pump. The '86 has a 6 pin, a 4 pin, a 2 pin plug and a spearate wire on the CDI unit. On the '87 the fuel pump relay is triggered by the red/yellow wire from coil #4. The yellow /green still is the tacho signal wire, but has a different signal and doesn't trigger the fuel pump relay. The '87 has two 6 pin connectors on the CDI. Link to comment Share on other sites More sharing options...
90base Posted March 17, 2017 Author Share Posted March 17, 2017 Cool, thanks for the insight. Ill keep hacking this one back together until one for an 86 shoes up online. I may have found one somewhere else too that claims it is for a 1986. So I need to look for one that has 3 red plugs grouped together at the back of the wiring harness? Thanks again Brandon Link to comment Share on other sites More sharing options...
90base Posted March 17, 2017 Author Share Posted March 17, 2017 Does this one look correct? (sorry for the HUGE pics, Im at work and cant resize) Link to comment Share on other sites More sharing options...
90base Posted March 17, 2017 Author Share Posted March 17, 2017 Or does this one look better? Link to comment Share on other sites More sharing options...
90base Posted March 19, 2017 Author Share Posted March 19, 2017 OK, well I took the harness off the bike and sat in my living room for about 3 hours cutting Shitty splices apart and soldering/shrink wrapping. Plus adding connectors for all of the lights. If I get time I'll put it back on the bike tomorrow and let you k of how it goes. Thanks again! Link to comment Share on other sites More sharing options...
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