Hey everyone,
Was on a joyride last night and the bike was running great at a steady 50 mph for 15 minutes or so.  I eventually started climbed a fairly good grade up a mountainside still at 50 mph in 5th gear and everything was pulling great when all of a sudden I had a drop off in power.  As soon as I backed off the throttle to downshift I had some backfiring then engine quit.  While still rolling uphill I was able to immediately get it to fire back up and turn around and head back downhill.  

I climb this hill regularly and have never encountered a problem like this ever.  Bike didn’t do it again the whole ride back and rode like nothing ever happened..  Ant thoughts?  I was thinking maybe some junk in my gas?  Bike was just checked out at shop month ago during inspection.

It’s a daily commuter for me so I’ll see if it acts up this week.

2013 w\ about 7800 miles.  All stock.

I did mention the engine quit on me in my previous post.  I pulled in the clutch, heard some small backfires and as my clutch was pulled in the engine quit.  I downshifted, started the engine back up and rode back no problem.

Sounds like you lost fuel.  

First, get a raptor petcock.  Stock petcock sucks.

The other possibility is that you lost vacuum and the slide dropped, which would take the bike straight down to a lean idle.  Lean because the butterfly valve is still wide open.   This happened to me once, but the bike didn't stall.  Not sure why it dropped, but my slide was worn and sticky. I replaced it and all is well.

I "idle" uphills doing 50 every day on my way home from work BTW.  Properly jetted, this bike is a tractor at any RPM.

Fifth gear
Uphill
Throttle open
Vacuum drops.

You're lugging the crap out of it.
Fifth gear at fifty MPH requires a level road and no appreciable head wind.
Or huge rider

'' 50mph in fifth gear is only 3340 rpm ,the bike doesn't even reach peak torque until 3400 rpm''

I don't want to start a ''rpm war'', BUT, how can you say 60 rpm away from peak torque is lugging?
Rember, everyone rides different. Not everyone expects neck snapping acceleration at all times. ( this is a mildly tuned thumper after all )
I run both Kaw pulleys and only turn 2800 rpm at 50. Seldom do I hit 4k, (but I do live in FLAT S. Fla ) I will let it drop to 40 in 5th and roll the gas on and it pulls fine. ( for me )
I am over 90k on this bike now from here to Salt Lake, Buffalo, NY, and a bunch of trips to Western NC, (I know Mo ) I think twice in W Va I had to downshift to 4th for big hills on the Interstate. (4th on my bike is almost like 5th on a stock bike)  
Lugging to me is when I can feel the seprate power pulses actully jerking the bike. Often that is not running the engine too slow, but applying too much throttle for the load/rpm.
Yes if you require feeling the power''now'' every time you twich the throttle by all means keep the rpms up. But a big single does not live by rpms alone.

Badwolf, tell me your running both kawa pulleys with a STOCK motor, I'm guessing that's not the case, which means your hp is about 27 at 2800rpm ,  what the stock bike might be doing at 4340 rpm at 65 mph, and you still have to down shift on a really steep grade . Why ? because the pulleys have raised your torque peak close to3500- 3700 rpm, so 2800rpm doesn't cut it. Your talking apples and oranges here.

 Gary your right perhaps I miss spoke , the pulleys slowed the motor's rpm bringing it away from Badwolf 's higher torque peak .

It's on RPM COMPRESSION RATIO WAR!!!!




Hey batman, that hill I go up hits 14% grade.  I know that because I ride my road bike up it all of the time.  Sure, it's not that steep very long and it's only a few hundred feet of elevations gain, but the tractor like the power of the thumper puts right up that thing.  And I'm 250lbs.  It's obviously because I have a raptor petcock and my bike is so perfectly jetted!    Flatlander my tushy!