Harley ST120 Throttle LAG
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Stage III
Joined: Mar 2016
Posts: 3
Likes: 1
From: Vancouver, British Columbia
Harley ST120 Throttle LAG
Hello
I have a 2015 FLTRXS with the new ESP friendly 120ST motor. The bike has Stage 1 with a Arlen Ness High Flow Intake, and a Vance & Hines High Output ProPipe.
Since the motor is new, I am stilling running a break in MAP for download and I have a street tuner on it.
What I am noticing is that the bike has a throttle lag, a hesitation at lower rpms when you just start to get going. Feels like an old carburated system flooding up, but in this case it could be fuel starvation.
Any similar experiences, tips, pointer etc would really help.
Thanks
I have a 2015 FLTRXS with the new ESP friendly 120ST motor. The bike has Stage 1 with a Arlen Ness High Flow Intake, and a Vance & Hines High Output ProPipe.
Since the motor is new, I am stilling running a break in MAP for download and I have a street tuner on it.
What I am noticing is that the bike has a throttle lag, a hesitation at lower rpms when you just start to get going. Feels like an old carburated system flooding up, but in this case it could be fuel starvation.
Any similar experiences, tips, pointer etc would really help.
Thanks
Seasoned HDF Member
Joined: Dec 2009
Posts: 9,166
Likes: 1,911
From: Doghouse... mostly
I'm gonna take a wild guess and say that it's solely the MAP and the Street Tuner that's causing all your grief. Get the SE Pro Performance Super Tuner, use the tuner you have as a jiffystand puck, and have a tech Dyno the engine properly.
Ultimate HDF Member
Joined: Nov 2005
Posts: 5,926
Likes: 138
From: NE Ohio
SO very true, any good flash tuner will be an improvement over that POS street tuner.
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Stage III
Joined: Mar 2016
Posts: 3
Likes: 1
From: Vancouver, British Columbia
Thanks Guys,,,,,
It seems like getting a good dyno tune with the Supertuner instead of the Streettuner will be my first try.
Much appreciated.....Ride On....Rubber Side Down
It seems like getting a good dyno tune with the Supertuner instead of the Streettuner will be my first try.
Much appreciated.....Ride On....Rubber Side Down
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Club Member
Joined: Jul 2014
Posts: 11,471
Likes: 3,572
From: Idaho
The SE Pro Super Tuner (or Super Tuner Pro, both are used) allows you or your dyno tech to change anything that needs to be changed to allow the bike to run as well as it can.
Last edited by IdahoHacker; Mar 14, 2016 at 11:47 PM.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
They did that to keep his warranty intact. Once he uses any other tuner to load a map and actually tune the bike his warranty for the 120ST is kaput. We can argue all day long about how much better off he is with the bike tuned properly with a full featured flash tuner but that is the reason.