Reset Harley Davidson Magneti Marelli Fuel Injection TPS Settings (Step-By-Step Guide)
NOTE: These settings are for EVO motors. TWIN CAM voltage settings are said to be different than the EVO settings. Read the posts here: https://www.hdforums.com/forum/igniti...
I did not have a TWIN CAM motor to verify any settings as mentioned in the forum. I would appreciate a comment below on your findings.
0:55 - Connect sharp metal pin into third wire on the Throttle Position Sensor harnes, left to right, 1, 2, 3.
1:20 - The DC voltage reading is 0.275 volts. 1.000 would be one volt DC.
4:00 - Use Blue Loctite on the cold and warm idle screws to prevent them from moving on their own. It does happen.
4:14 - ATTENTION:
1340 Domestic/80ci - 0.620 to 0.650 volts DC
1450 Domestic/88ci - 0.650 to 0.680 volts DC
Use the voltage setting for your motor size!
0.650 is recommended as a starting point. Adjust faster or slower after testing when the bike is cold started.
Rough idle? Hesitation off throttle? Backfiring or hard starting?
If your Harley isn’t responding smoothly, your TPS settings might be the problem.
In this video, I’ll walk you through how to reset Harley Davidson Magneti Marelli fuel injection TPS settings correctly, so your bike runs smoother, responds faster, and idles like it should.
🏍 What You’ll Learn In This Video:
✔️ What the Throttle Position Sensor (TPS) does
✔️ How the Magneti Marelli fuel injection system works
✔️ Symptoms of incorrect TPS voltage
✔️ Required tools (multimeter, scan tool options)
✔️ Step-by-step TPS reset and adjustment procedure
✔️ Proper voltage specs and baseline settings
✔️ Common mistakes that cause poor throttle response
✔️ When to reset vs. replace the TPS
This video is ideal if you’ve searched for:
“Harley Magneti Marelli TPS reset”
“Harley fuel injection troubleshooting”
“How to set Harley TPS voltage”
Many older Harley-Davidson Touring, Dyna, and Softail models use the Magneti Marelli EFI system — and proper TPS calibration makes a huge difference in rideability.
Incorrect TPS settings can cause:
• Surging at steady throttle
• Poor fuel economy
• Hard starting
• Engine hesitation
• Check engine light codes
Dialing it in correctly restores smooth throttle response and improves overall performance.
If this guide helped you, hit LIKE so more riders can find it.
Subscribe for more Harley-Davidson repair tutorials, motorcycle diagnostics, fuel injection tuning, and real-world garage fixes.
Comment below with your year and model — and tell us what symptoms you’re experiencing.
#HarleyDavidson
#MagnetiMarelli
#HarleyEFI
#MotorcycleRepair
#HarleyMaintenance
#FuelInjection
#HarleyDyna
#DIYGarage
DISCLAIMER:
The content presented in this video and on this page/platform, including all information, demonstrations, opinions, comments, and materials, is provided for general informational and entertainment purposes only.
Mark Young makes no representations or warranties of any kind, express or implied, regarding the accuracy, completeness, reliability, suitability, or availability of the information contained in this video or associated page/platform. Any reliance you place on such information is strictly at your own risk.
Under no circumstances shall Mark Young be held liable for any direct, indirect, incidental, consequential, special, or punitive damages, or any loss or damage of any kind, including but not limited to personal injury, property damage, financial loss, or other damages arising out of or related to the use of, misuse of, interpretation of, or reliance upon any information, demonstrations, comments, or materials presented in this video or on this page/platform. This limitation applies whether such content is provided by Mark Young or by any third party through comments, sharing, embedding, or redistribution.
The content in this video and on this page/platform does not constitute professional, mechanical, technical, legal, financial, or safety advice. Viewers should always seek the advice of qualified professionals before attempting any procedures, repairs, modifications, or actions discussed or implied in this content.
Any actions taken based on the information provided are performed solely at the viewer’s own risk. Proper safety procedures, protective equipment, tools, training, and working conditions should always be used. It is the sole responsibility of the viewer to determine the appropriate safety measures necessary to protect themselves, others, and property.
Mark Young assumes no responsibility for errors, omissions, outdated information, or for the results obtained from the use of the information provided. The information in this video and on this page/platform may be modified, updated, or removed at any time without notice, and there is no obligation to update previously published content.
This disclaimer extends to all affiliated pages, channels, platforms, social media accounts, and any third parties associated with or sharing this content.