Johnny Glass
XS650 Enthusiast
1982 xs650
stock carbs
#45.0 Pilot Jet
#142.5 Main Jet
2-1 XS Performance Headpipe Set
Part #07-0041 taper muffler
K & N stock looking air filter
Thats my set-up. Here is what my plugs look like after about 300mi:
Here is what my headpipes look like as well:
Now it backfires a little bit mostly on deceleration a bit while idling. I thought that meant a rich condition. Which the plugs support that thought, and I think the head pipes do as well. But when I adjusted the fuel mixture screws to be leaner it backfired worse. So I am a bit confused? Power seems pretty good across the board if anything it's has a bit of sluggishness on the lower end of throttle. Wich makes me believe it's the idol mix or pilot jet to big?
So my question is this: What is the most likely cause of the backfiring and how do I fix it?
Thanks in advance.
stock carbs
#45.0 Pilot Jet
#142.5 Main Jet
2-1 XS Performance Headpipe Set
Part #07-0041 taper muffler
K & N stock looking air filter
Thats my set-up. Here is what my plugs look like after about 300mi:
Here is what my headpipes look like as well:
Now it backfires a little bit mostly on deceleration a bit while idling. I thought that meant a rich condition. Which the plugs support that thought, and I think the head pipes do as well. But when I adjusted the fuel mixture screws to be leaner it backfired worse. So I am a bit confused? Power seems pretty good across the board if anything it's has a bit of sluggishness on the lower end of throttle. Wich makes me believe it's the idol mix or pilot jet to big?
So my question is this: What is the most likely cause of the backfiring and how do I fix it?
Thanks in advance.