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 Hesitation during initial acceleration
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Joined: Jul 2007
Posts: 46
Greenhorn
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OP
Greenhorn
Joined: Jul 2007
Posts: 46 |
All,
My 03 America with 10k miles, has started to hesitate during initial acceleration. Cold, warm or hot give her the gas and she hesitates and bogs a bit and then takes off…any ideas?
Thanks Wheezer
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Re: Hesitation during initial acceleration
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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Monkey Butt
Joined: Jan 2005
Posts: 7,643 |
I think people on here may need to know a little more about your setup Wheezer (Bob).
Ray(UK)
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Re: Hesitation during initial acceleration
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Joined: Jul 2007
Posts: 46
Greenhorn
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OP
Greenhorn
Joined: Jul 2007
Posts: 46 |
Stock set up - std 790cc w/ D&D pipes
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Re: Hesitation during initial acceleration
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
On both of my bikes the cause stemmed from the hidden inline filter at the fuel line/carb junction. Once that was removed and a separate inline filter was installed the problem went away.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: Hesitation during initial acceleration
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Joined: Jul 2007
Posts: 46
Greenhorn
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OP
Greenhorn
Joined: Jul 2007
Posts: 46 |
Thanks for the info. How difficult is the removal of the hidden inline filter at the fuel line/carb junction. And, what (type, make, place of purchase) inline filter did you install?
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Re: Hesitation during initial acceleration
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Quote:
Thanks for the info. How difficult is the removal of the hidden inline filter at the fuel line/carb junction. And, what (type, make, place of purchase) inline filter did you install?
Not so easy, the filter is located at the inlet tube that connects the two carbs (at the base of the fuel line between the carbs). A very long needlenose and patience are required as is tank removal. The I used a metal Wix inline filter (#33027 from O'Reillys), it's a metal can and not too clunky looking between the carbs. There's a much sexier looking K&N in the tech vault . Doesn't take much contamination to make the weeny little filter not work so good. filter picture courtesy ssjones
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: Hesitation during initial acceleration
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Joined: Jul 2007
Posts: 46
Greenhorn
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OP
Greenhorn
Joined: Jul 2007
Posts: 46 |
A bud at work offered his hot sports opinion - tell me what ya think. He said he thought she is running to lean and now that the weather is getting colder... I do have moderate blueing on the 1st 2 to 3 inches of the manifold so I know I'm running a little hot. And, on the way home from work (about 71 degrees, this am it was around 40) the hesitation was minor and then nonexistant but she didn't seem to be as responsive/quick as she usually is... I plan to pick up a K&N gas filter on Friday and attempt an install as well as a tune up on Saturday anyway. Thanks for the help! Bob
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Re: Hesitation during initial acceleration
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
If it runs fine once the engine gets above 3500 or so RPM, you might need bigger pilot jets. If it runs fine below that speed, the main jets could be too small.
Could also be that the slide springs are getting a little soft and the slides are opening too soon (or not closing up when you reduce the vacuum by opening the throttle). This causes a drop in air flow and the mixture leans out because there isn't enough pull on the feed jets.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: Hesitation during initial acceleration
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Joined: Jul 2007
Posts: 46
Greenhorn
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OP
Greenhorn
Joined: Jul 2007
Posts: 46 |
bigger pilot jets seem to be in order...thanks for the tip. Thanks to all for helping!
Bob
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Re: Hesitation during initial acceleration
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Joined: Jan 2005
Posts: 4,072 Likes: 80
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 4,072 Likes: 80 |
You just might need bigger pilots with the D&D's if you can't compensate by turning the mixture screws out a bit. Hesitation when you roll on the power usually is brought on by the carbs not being properly synchronized... could be something else to look at.
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