Way too rich, heavily farkled, high elevation, stumped
Just installed a 685 kit on my 2011 KLR650. After my initial break in, I'm finally ready to rev over 4-5k and the engine keeps dying. Cause appears to be 30% [10:1 AFR] too much fuel. While it will run in the 2500-3500 RPM range with this ratio, any higher and it jumps, bogs, and applies power again after a 14.7:1 AFR is reached. So I'm getting too much fuel... can't figure out why.
Location: 5500 ft
I have a lot of mods to increase air flow:
L-mod, K&N filter, snorkel removal, high flowing exhaust tip.
Data Acquisition: I installed an Innovate LC1 to read my O2 levels. To prevent a misreading, the fresh air injection system was deleted. This device allows me to know that I'm getting 30% too much fuel anytime I'm off idle.
I have the same issue with OEM needle shimmed, or Dynojet needle. I do feel like the bogging was higher in the RPM band with the OEM though. New plug since install, not sure if I gapped it...
Mixture Screw: Out 1, 1.5 & 1.75, no real decrease in total off throttle fueling.
145 main [stock]
40 pilot [stock]
- Just ordered 137.5 & 140s along with a 38 to put in. I expect a step down of 2 sizes, which is appx 15-20%. This is required for a proper tune; however, I wouldn't expect those to make me run 30% too rich.
Carb Cleaning: Was disassembled 3 times over the last few days for a complete cleaning with air & fluid. All vent lines were removed, cleaned & reattached. The diaphragm has been checked, needle collar there, washers on top of needle, orifices cleared, etc...
Any ideas y'all would like to toss my way? I'll be sure to keep this updated when I swap in the replacement jets. I made so many mods during my last tear down that this is like starting from scratch on a whole new bike. Hope it will feel like a new bike after I'm done...