thanks for the replies fellas.. I really appreciate the input.
So some answers and questions...
It has NOT been on a single tank of gas, I have put new gas in since the issue started.
FI lights comes on fine when I turn the key, fuel pump primes like always, bikes starts absolutely normally and sounds fine. I don't really "warm up" the bike, i turn it on and take about a minute to gear up. I then maneuver out of the parking lot onto the road and give it gas, that is when I notice the issue. It is right around 5-6k RPM that it starts "bogging" and chokes if I push it, seems fine under 5k rpm. No FI light comes on when the issue is occurring.
I keep moving slowly down the road and within usually 100 yards or so full power kicks back in and I feel it surge forward. Bikes acts perfectly normal from there on out.
As far as I know the venting on the gas tank is OK. I have not noticed any issues or sounds other than normal venting when parked.
Sparks and air filter are probably due for a good change/cleaning , its probably been over 10k, but I don't want to assume its those... as
A) If spark was bad then at least one cylinder wouldn't be working, at least not correctly, and I think I would notice the issue regularly at all RPMs...
B) If air filter was clogged, and not letting the bike breath, it would not magically fix itself after 30 seconds and then reoccur on a different day.
I thought about the fuel filter, but I have the same thoughts on that as the air filter. I can't imagine it would get clogged, then unclog itself, then do the same thing again a week later under similar conditions, so on, so forth....
I thought about the cold too, but it's not cold here. Given its about 25 degrees cooler at night than day, but I'm in AZ so our night temp lately has been 75ish... and I've taken this bike through snow without these issues in the past.
If you think its still likely spark, air filter, fuel filter, etc... let me know! but let me know why... I'm willing to dig in, if it makes sense to me to do so.
If it's possible this is being caused by valves, or TB, or anything outside of my regular maintenance, please explain to me how/why so I know what I'm getting into.
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Last edited by amir_zwara; 09-26-2013 at 06:37 PM.