Why is my bike running rich? I did all the carb mods several months ago (I've put at least 2000 miles on it since) and last week I checked the plug (light gray) and the HMF muffler looked pretty clean inside - after riding this weekend I checked the muffler exhaust and it is thick with black carbon deposits. I also noticed some backfiring for the first time at around 70 to 80 mph when decelerating - what gives?

 

Sounds like it is jetted wrong, what did you do to the carbs recently?

 

I haven't touched it since the mods. It was running so good too!

 

HAs the weather changed alot in your area since you adjusted them?

 

I would blame it on the person that did the carb work. I will also say:[sm=ttiwwp.gif]
(of you running naked of course)

 

Generally if the weather cools down that would make it run leaner since the air is more dense but the fuel delivery is the same. Are you sure it's not running leaner? Decel popping generally indicates a lean condition.

Quick test - try restricting the airbox a little and see if it gets better or gets worse. If it gets better, you're lean, if it gets worse, you're rich. Try raising or lowering the needle one clip position accordingly and/or increase or decrease the main jet one size. Readjust the pilot circuit afterwards.

 

Air filter dirty or over oiled? Mine went from rich to lean after cleaning the filter.....oops[:@]

 

Alright I did her carb mods, and maybe I had one too many beers when I was doing it plus she was wearing a bikini top while handing me tools - give me a break guys!

 

NoBrakes, I'll check the filter and put the KDX snorkel back on an try it. The weather has cooled down from the high 90's into the mid-80's, same low humidity (10%).

Mark I told you to keep your eyes on the carb not me!

 

I was going to post [sm=ttiwwp.gif]but someone beat me to it. And no Mark we are not talking about you.[8D]