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  #21  
Old 1st February 2008
2007Low's Avatar
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Sportster/Buell Model: XL1200 Low/TTS/Gronked
Sportster/Buell Year: 2007
Sportster/Buell Model #2: XLCH1000
Sportster/Buell Year #2: 1975
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Quote:
Originally Posted by linkin5 View Post
I don't know if all bikes that stumble when cold are gonna have the fuel pump issue. I haven't checked my tag yet to see if I have the bad one yet, I don't think I do as I get good gas mileage and poor mileage was another symptom of the bad fuel pumps. But I do have the cold stumble and it has died on take off once due to this, and I will now check the lable on my fuel pump to see if I have an affected one.
Yeah the tech tip to the fuel pump pressure regulator won't fix the stumble, I had it done to mine and it did improve the gas mileage but if anything the stumble actually got a little worse. Thanks for responding, I am going to take this thread with me to the dealer and also going to some how get it to corp HD Tech Services.
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  #22  
Old 1st February 2008
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Default The Stumble at 30 Seconds... Arrrgh..

Pretty much every time I fire up the bike when cold, it will be running fine, but at some time in the first minute, it will just GULP, and totally miss a beat or two, like I uncorked both sparkplugs, and injectors. Its the strangest thing. Kind of like the old transition from open to closed loop on the ancient Delco systems.

After this happened a couple times, right at the end of the street, where I pull into traffic, the hindbrain figured it was a good idea to sit in one place 'til sweetie-pie gets that first burp outta her system, or else I'm going to end up as a Kenworth hood ornament.

Having said all that, I'm really, really REALLY unimpressed with the overall driveability and tuning of the stock FI system. Basically, it runs just to the good side of crap, pretty much all the time, has its ok days, and bad days, messes with me for a while by running real smooth, and then gets a wild hair up her butt, and decides to get a bit herky and jerky for a day or two.

Moody darn thing. What's up with that?

So I bring it to the dealer, they wave a dead chicken over it, say its better, it runs smooth for 50 miles, and then, back to running lean. I think that's the basic problem.

I've been lurking around the bunch of threads for fuel injection tuning, bla bla, but gosh, silly me, I thought that "New Motorcycle" meant "New Smooth Running Motorcycle That I Wouldn't Have to Re-Engineer". I guess if I wanted that, I should have bought a Honda.

In any case, its just a matter of time until I rip the lungs out of the FI controller, swap out the O2 sensors, and make it run nice. Can it be so hard?

Tell you what - I'm a PWB designer, and have laid out Fuel Injection controllers for Delco, Ford, Magnetti Marelli, Detroit Diesel, and Cummins (Ex Motorolan, AIEG) If there's anybody out there that needs a new FI controller PWB designed for the Sporty, get me a schematic, And I will Do It For Free, just to drive a stake through the heart of the crummy stock system.

I'm not talking an injector bandwidth bump-in-line tuner, but the real deal.

Jeff
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  #23  
Old 1st February 2008
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If you will only accept pefection your only solution will be learning to tune a sert with us or go with a Micrsquirt. If your bike it totally stock, my guess something is messed up. My bike was near perfection, before is started messing with the EFI/Exhaust. If it refuses to dial right in, I may elect to put it back stock. I will accept almost nothing short of seamless power delivery.

That is why I bought an EFI bike.

AW
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  #24  
Old 2nd February 2008
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Sportster/Buell Model: XL1200 Low/TTS/Gronked
Sportster/Buell Year: 2007
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Sportster/Buell Year #2: 1975
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Originally Posted by whittlebeast View Post
If you will only accept pefection your only solution will be learning to tune a sert with us or go with a Micrsquirt. If your bike it totally stock, my guess something is messed up. My bike was near perfection, before is started messing with the EFI/Exhaust. If it refuses to dial right in, I may elect to put it back stock. I will accept almost nothing short of seamless power delivery.

That is why I bought an EFI bike.

AW
Well I just don't believe that a new bike, especially an EFI bike should malfunction like this. Mine is completely stock and aside from this little glitch, it is a wonderful machine. I just want HD to get to the bottom of this, I know riders with the other EFI HD bikes, the Glides and the like that don't have this type of problem and these bikes shouldn't either. This is pretty high tech stuff, should work without having to buy a tuner.
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  #25  
Old 4th March 2008
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Hey, I'm going back to the dealer a week from Friday, just wanted to check and see if there's anyone else having this same problem and would like to log it here. I'm taking this with me to the dealer, hope it will help HD understand that they have a problem or two that they need to resolve. Thanks
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  #26  
Old 4th March 2008
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Sorry I missed this the first time around.
Bought July 07.
I would let it warm up maybe a few minutes, ride about 1/4 mile to main road and it would caugh (stmble) a bit from the stop sign, about 60 to 70 outside. Then that would be it. No more during the day even after it sat a few hours.
Put SE 50 states on and did not get any worse, about the same.
But it did not do this every day, just every 5 to 6 times I road and only in the AM.
Did the Heavy Breather and Fuelpak, still caughed a bit once in a while. But it would caugh and stall instead of just stumble.
Bike ran rich enough with the Fuelpak my milage dropped by almost 10 in town and on the road. Plugs were black
But that was when it was in the 40's here
Can't say what it will do when I get it back. SERT and dyno at dealer, waiting for warmer temps to dyno it.
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  #27  
Old 4th March 2008
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My story is almost exactly the same as stevep48. I have the 07 N with SE Stg1 a/c, V&H straight shot slip ons, and the FuelPak. I did call and got some different numbers for the FuelPak but it's still not perfect. 2007Low, hope you keep me and everyone else informed! Thanks!!
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  #28  
Old 4th March 2008
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Stock '08 N....occasionally from a dead cold stop it will feel like it is going to die once or twice after giving it initial throttle.

Almost as if someone is turning the power off for a brief second and then back on and then off again before it comes completely on.

It hasn't died, just stumbled pretty bad, but once it gets 50 feet down the road it is fine.


Getting SERT, SE Breather, and short shots put on today so hopefully that solves it.
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  #29  
Old 4th March 2008
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ive ridden motorcycles all of my life and this is a very common problems with fourstoke engines in general. it doesnt seem like a very serious or new problem.
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  #30  
Old 4th March 2008
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Quote:
Originally Posted by bryant View Post
my bike always does the stumble you are talking about when cold. I have an 06 1200 custom.
That's an issue of idle misture which you can eaily fix yourself. It shouldn't happen on an EFI bike.
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