Hi guys , 07 xx with yoshi muff on her , k&n air filter . Looks like it’s got a tuner of some type under seat . Not sure when plugs changed they are a nice colour on electrode . Bike starts and runs nice but then sounds like it gets Rich and stumbles at idle , it rides fine but when throttled back starts popping back through muffler . Thinking of puttin new plugs and genuine filter in . What do you guys think ? . Any help appreciated 😊😊. Nick
Ah then that's why it's sooting. They are tuned rich from the factory as a rule. It also explains the popping.
Just thought of something. Does have an 02 sensor bung in the pipe. It'll be back in the junction just before the Y split. Or just behind the rear brake Master cylinder and footpeg.
Ah the system is going to lean out per the factory AFR. That'll make it want to pop as well.
Have you tried doing a delete on the 02 sensor to see if it stops the popping.
With your setup that thing should be running lean. I suspect your driving stuff crazy with the 02 hooked up. The system is swinging the fuel table point all over.
Are you feeling a surging at around 135 klicks. While trying to hold a steady throttle?
Checking for codes will probably give you no results but it won't hurt.
You can buy a delete plug from Dynojet. Or you can bridge the heater circuit for the sensor with a 300 ohm resistor.
The system only looks for a heater voltage.
What your dealing with is a fueling issue. Pull the 02 sensor first and see if it settles down.
What was the tuner that was in there?
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