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Discussion Starter #1
Having an issue where I get a lean backfire into the throttle bodies when the throttle is blipped at low RPM's like during a downshift. The delkevic slip on i installed has made it a bit worse, but not by much. It did however die at a light when I gave it a quick throttle to take off. It wont happen when I'm smoother with the gas, but it seems like this shouldn't be an issue.

I'm going to go through and check for air leaks, but I'm interested to see what everyone else thinks. It's a brand new bike, and I dont want to ruin it by running it lean.

It also tends to surge a whole lot at constant throttle- another symptom of a lean fuel condition.

The bike has pretty much been doing all this from the start. The only think I have seen to scare me, is a bunch of fibers from the air filter inside the airbox, but they are on the outside, so it shouldn't be a problem.

Any thoughts are greatly appreciated!
 

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Discussion Starter #3
No time on the dyno, or any other diagnostics for that matter. My last bike had 4 carbs, so I'm used to reading the signs. Maybe it's just FI that I'm not used to. The surging is a bit frustrating after having such a smooth 4-cylinder bike, but maybe it's just part of the game. I feel like it's a bit worse than when it was new, but I can't say for sure. After 2nd gear it's not a problem. It would be nice to have it a bit richer at the 3-4K range just so I can maintain a constant throttle without jerking around.
 

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I think this is just a fuel injection issue compounded by the emissions standards. My bike is the same, did you notice if you slam the throttle shut in first and back open the bike wheelies right up no clutch necessary. Its not pretty but its a wheelie. I have found that if I play the clutch more than some other bikes I have owned I can stay out of the low speed surging and pulsing keeping in the rev range the bike likes. This technique has taught me some tricks on my Buell 1125CR also, surging is neck snapping on that bike down low. An option would be a Power Commander V or a 3 which you might be able to find cheaper as 3 is discontinued I believe.

Anyone try a 2Bros Juice Box they look interesting and claim to accept PC maps.
 

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Have you tried rotating the main throttle sensor 0.5mm clockwise to richen the fuel a bit?

What year mode V?
You in Cali.. so you have Cali model with emission box on Left side?
Do have a O2 sensor on this bike?

My Mk2 2012 model has an O2 sensor ha terrible surging @~3000. I have put on a PowerCommander5 + autotune O2 sensor and my surging issues have gone.
 

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Discussion Starter #7
THE THING IS ALREADY COVERED IN DUCT TAPE!

And my chain failed after 500 miles because I used WD on it...

I think I may try the TPS adjustment, because at least its free and reversible. Has anyone done it using a multimeter? I'm curious to know what kind of numbers I should be looking for as far as CHANGE in voltage.

Thanks for the replies!

Oh, also bike is a 2014 California model. No 02 sensor but it does have the emissions canister. It's green, so it's the fast one.
 

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I had the Delkevic Mini 8's on my FJR popped like a popcorn machine on Decel. Took them off and put the stockers back on.
 

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I rotated my main throttle sensor counterclockwise just enough to have voltage output at WOT within spec. This raised idle position voltage output just a bit over spec range. It adds enough fuel at low throttle opening to also cure the lean stumble at near 2,800 rpm.

Have you not already sealed off your PAIR valve first?
 

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Discussion Starter #10
No, I need to plug all that up, but there was a pretty big earthquake here today so most of the stores are closed to clean up. I'm going to get that all blocked off as soon as I can.

That shouldn't change the measurement coming from the sensor though, right?
 

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Discussion Starter #12
The TPS. Like, even if my PAIR valve is still installed in tact, it is not effecting an adjustment of the TPS.
 

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Glad you're doing OK otherwise. It's all over international news on TV. Largest earthquake in 25 years in the San Francisco Bay and Napa area. 6.0 on the Richter scale... Did you sustain any damages beside some inconvenience?
 

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Discussion Starter #15
Thanks for the confirmation.

Yeah, it was definitely intense. Almost threw me out of bed 27 miles away from the epicenter. I spent all day at the winery where I work unstacking barrels which had tumbled over. The whole time hoping there wouldn't be another aftershock. Each one weighs 600 lbs full, so it could definitely make your day worse. It blew out all the locked doors and emptied all of the cabinets of their contents. Crazy stuff for such a "small" quake.

Sounds like everyone is okay- for the most part- though.
 

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On the evening news that I watch, they said that this quake was at 6.1 on the Richter scale, and that the one 25 years ago which was at 6.9 (or 6.7?) was TWENTY-TWO times more powerful.

HOLY SH*T BATMAN!
 

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Discussion Starter #17
Just an update...

I backed the TPS the bare minimum...like .25mm. I could barely tell that I moved it. The bike seems to run much smoother. Next step is to block off the air injection system to see if that clears it.
 
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