Coolrunning39
Go Kart Newbie
- Location
- Denver
If PO did have JB4 on chances are it was removed. That's the nice thing about the JB4....easily removed if you are under warranty and need to take into dealer. I had to do this once for CPO water pump housing replacement on mine when I was running the JB4. Your friend probably knows this already but if the JB4 has been removed the one thing you can check is the red AFR wire at the firewall. The red wire is where you install the JB4 posi-tap into the AFR wire, so there should be a little mark + small hole that you can see. You may have to pull back the black rubber sleeve a bit and inspect the wire. Here's a pic with the posi-tap installed....
Solid little write up on how to check on this, thank you!!!