Need help diagnosing Sportster problem

Reply Subscribe

Thread Tools

Search this Thread

#11

02-08-2016, 07:27 PM

DigitalDave

Cruiser

Join Date: Sep 2015

Location: Victorville, CA

Posts: 106

Likes: 1

Received 1 Like on 1 Post

Crank position sensor. +1 My '06 had became flakey, power loss etc, replacing the cps solved the issue. Don't know about your model year, but the earlier ones had lots of problems with this.

Reply Like

#12

02-09-2016, 06:18 AM

stereoguy

Outstanding HDF Member

Join Date: Jun 2011

Location: Springfield, IL

Posts: 3,126

Likes: 65

Received 547 Likes on 185 Posts

Quote:

Originally Posted by DigitalDave

Crank position sensor. +1 My '06 had became flakey, power loss etc, replacing the cps solved the issue. Don't know about your model year, but the earlier ones had lots of problems with this.

This, pretty frequent problem with Sporties, not expensive and easy to replace. Take yours with you as there are a couple of variations as to length of the wire.

(borrowed picture)

Reply Like

#13

02-09-2016, 09:32 AM

hammer6315

HDF Community Team

Join Date: Jan 2010

Location: western shore of Gitche Gumee

Posts: 716

Likes: 457

Received 196 Likes on 145 Posts

Quote:

Originally Posted by todd.jach@att.net

Hi all,

I need some tips on how to diagnose a problem with my Sportster.

2012 XL1200C, 15000 miles
Mods:
V&H twin slash slip-ons
SE Stage 1 air cleaner kit
FuelMoto micro EFI tuner

I've had the bike for two years (I bought it used - had 800 miles) and haven't had any problems until recently.

The bike runs fine when cold, but after it warms up I get brief losses of power when accelerating from idle.

What I have tried...

I've run both Seafoam and Techron fuel injector cleaner (at different times) through full tanks of gas.

I replaced the plug wires (the rear cylinder tested out of spec with multimeter) and plugs.

Any help will be greatly appreciated.

I have a 2012 1200 Custom. I too, had the off-idle stumble, along with other issues. I tried various cures, & the one that finally solved the problem was the Dynojet Power Vision. It comes with various maps preloaded into it. Easy to install. (I did not have luck with my Micro Tuner either)

Last edited by hammer6315; 02-09-2016 at 12:09 PM.

Reply Like

#14

02-09-2016, 10:07 AM

Cool Inferno

Road Master

Join Date: Dec 2014

Location: Florida

Posts: 1,036

Likes: 2

Received 45 Likes on 39 Posts

Quote:

Originally Posted by hammer6315

I have a 2012 1200 Custom. I too, had the off-idle stumble. I tried various cures, & the one that finally solved the problem was the Dynojet Power Vision. It comes with various maps preloaded into it. Easy to install. (I did not have luck with my Micro Tuner either)

I was thinking that also. I have never been a fan of piggy back systems like the Micro tuner that tricks the computer and those that eliminate the O2 sensors. When they go bad and problems start, the last thing you would suspect is the tuner. I had problems before with piggy back systems like the power commander. I prefer flash tunes 100%.

To the OP, contact FuelMoto and talk with someone in support. Maybe they can help if its a tuner issue. I'm leaning that way because it happens after the bike warms up.

Last edited by Cool Inferno; 02-09-2016 at 10:14 AM.

Reply Like