Redfish-Joe
Senior Member
Not real familiar with the Sportster but I had one here last week that was running bad. 05 Custom. Long story short it was the CPS. Now, does that year / model have one?
I found very weak spark
Could my melted sensor have destroyed my module?
If you have stock ignition you should be OK, as far as the decel popping, have you considered some type of baffles in the straight pipes? Straight pipes are notorious for de cel popping, there is nothing in the pipes to keep the un burned gases in check and No back pressure to help with exhaust scavenging, it is quite possible you could be sucking in some un burned exhaust this will compromise intake fill and give you a weird combustion mixture JMOWell, it's been a long time but thought I'd update if anyone can use my experience. I finally got it running decent a few weeks ago. Problem is I don't know what fixed it! Replaced in this order:
Plugs - Coil - Sensor - Module - Battery - Plug wires - Carb rebuild.
I had suspensions of intake leak even though I tried the either method. It was difficult because it would run only at high RPM. The way the carb is secured with the breather makes it tricky. Being so frustrated with it, plug wires and carb rebuild were the last things that seemed to have fixed it. Old plug wires tested out with the ohms test and carb was rebuilt just months before problem started.
Only problem left is it has a bit of popping on de-accelerating that it didn't have before. Keep in mind this is an 883 to 1200 conversion with K&N air cleaner mod and straight pipes. I still need to time it (I can't see the mark through inspection plug with oil spray). I don't have the numbers of the jets at hand but the low speed was over size and the high speed was stock. But! it runs decent!