some suggestion for you Throttle Position Sensor

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Portofino Norton's Garage

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Dears Commando 961 owners I would share an interesting experience I got with mine SE.
Thinking about the irregularity of engine operation I felt that some responsability could be on TPS side, given the sensation that often the bikes seems not knowing exactly and with the required accuracy the throttle position (for instance when you approach a curve with closed throttle). Thus I decided to replace it with an identic common spare part for automotive fitting more Alfa Romeo, Fiat, Citroen and so on. Manufacturer is Facet code 10.5001. Well...engine behaviour was really stabilized and significantly improved with a very low cost.

Second suggestion: if you experienced engine switch on difficulties, like myself:mad::mad::mad:,I suggest to follow the procedure: switch on key start, have a full opening and full closing of the throttle in order to teach:D the ECU concerning the TPS full excursion and only then act the ignition on pushing (with closed throttle). With this procedure my SE starts always properly now.
 
I have seen this done in some of the early Norton Factory Videos . You explaining it make it clear what they were doing.
 
There were a batch of bad TPS in 2013/2014. We had to replace many of them in Canada.

Thanks for the part number.

For those in North America its also a Harley Davidson TPS part.
 
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Interesting.
One of the last two unresolved issues may be a bad TPS.
My quick throttle blips can not be relied upon to produce the desired results when downshifting.
It's frustrating, sometimes the blips work, sometimes there is no discernable reaction from the engine.
Makes for exciting downshifts.
I thought it might be a ECU related issue.
I'll have to check out the tps.
 
BritTwit said:
My quick throttle blips can not be relied upon to produce the desired results when downshifting.
It's frustrating, sometimes the blips work, sometimes there is no discernable reaction from the engine.
Makes for exciting downshifts.
Click to expand...

I concur! When I first started riding my Sport I blamed it on my 63 year old wrists. A few of those downshifts caused my rear wheel kick out! But I rarely had this problem with my Daytona or Speed Triple.
 
I thought it was my technique also.
But throttle blips on my Ducati are precise.
Same on my MK3 850, which by the way has 43 year old carbs.
Sounds like the tps is worth looking into.
 
Never really had problem with the blips, but sometimes just a quick rev will keep it hanging up at 1600 rpm instead of dropping to 1200. Thanks for the info.
 
gchoppin said:
The Harley TPS sensor part number is 27629-01A if anyone needs it. It's a match. Even says "Made in the United Kingdom" on the box. Should be available in HD dealerships world wide.
Click to expand...
Great news! Especially since I have 2 $25 H-D gift cards I had no use for until now. ;)
 
Portofino Norton's Garage said:
Second suggestion: if you experienced engine switch on difficulties, like myself:mad::mad::mad:,I suggest to follow the procedure: switch on key start, have a full opening and full closing of the throttle in order to teach:D the ECU concerning the TPS full excursion and only then act the ignition on pushing (with closed throttle). With this procedure my SE starts always properly now.
Click to expand...
Is this something you do when you start the bike from cold or every time?
 
richard-7 said:
There were a batch of bad TPS in 2013/2014. We had to replace many of them in Canada.

Thanks for the part number.

For those in North America its also a Harley Davidson TPS part.
Click to expand...
Hello Richard, we've got a 2013 961 with persistant start-up and idling issues, and we are proceeding to change as many sensors as we can get our hands on (after having read that virtually every sensor on these bikes is unreliable).
We replaced the Head Temp sensor, camshaft position sensor, and crank position sensors with Bosch units so far, and we ordered the Harley Davidson 27629-01A Throttle Position Sensor as recommended in this thread. However, it seems that the HD sensor spins in the opposite direction of the CTS unit fitted on the bike, so the bike idles super rough and instantly dies when you hit the throttle. As soon as we reinstalled the original CTS unit, it ran fine. We couldn't figure out why at first but then noticed that the two sensors spin in opposite directions (although the two parts look identical). The HD part was brand-new and sealed in the original box, just picked it up from the local HD dealer in town today.
Everyone in this thread seems to agree that the Harley part 27629-01A is a direct replacement, so we're super confused. Your original post was from 2018, so I'm wondering if anything has changed since.
Thanks very much for your time!
**Also, are you in Southern Ontario or Colorado? We're in Montreal!
 
@SirJoe17 Can I suggest that if you are seeing a lot of problems like this that you go to https://www.scs-delta.co.uk/product-page/norton-961-communications-obd-lead and purchase that item?

By doing that you will be able to get some actual data on what is being seen at the ECU, which might help to pinpoint sensor issues.

I'm only a junior at this, but you will also notice that the TPS is "under tension" when installed. When you unfit and refit the TPS, it isn't likely to go back in exactly the same location, and therefor it's base reading is different. I suspect (but don't know) this is why the ECU takes a "base value" at key-on. In an unlocked ECU you can turn this off and just set the exact value that you want (meaning you need to reset that value if you remove/refit it.

That lead will also allow you to confirm a calibration of a TPS to some extent, as you will be able to verify it's movement and reading by the onscreen display vs the movement at the handcontrol.
 
SirJoe17 said:
Hello Richard, we've got a 2013 961 with persistant start-up and idling issues, and we are proceeding to change as many sensors as we can get our hands on (after having read that virtually every sensor on these bikes is unreliable).
We replaced the Head Temp sensor, camshaft position sensor, and crank position sensors with Bosch units so far, and we ordered the Harley Davidson 27629-01A Throttle Position Sensor as recommended in this thread. However, it seems that the HD sensor spins in the opposite direction of the CTS unit fitted on the bike, so the bike idles super rough and instantly dies when you hit the throttle. As soon as we reinstalled the original CTS unit, it ran fine. We couldn't figure out why at first but then noticed that the two sensors spin in opposite directions (although the two parts look identical). The HD part was brand-new and sealed in the original box, just picked it up from the local HD dealer in town today.
Everyone in this thread seems to agree that the Harley part 27629-01A is a direct replacement, so we're super confused. Your original post was from 2018, so I'm wondering if anything has changed since.
Thanks very much for your time!
**Also, are you in Southern Ontario or Colorado? We're in Montreal!
Click to expand...
I don’t think Richard checks in on here very often now, so I advise sending him a P.M.
Please note there are two other TPS sensors listed on the alternate parts list here..

www.accessnorton.com

Norton 961 Motorcycle Alternative Parts

Modern Norton 961 Alternative Parts lookup.
www.accessnorton.com www.accessnorton.com

hope this helps,

Cheers,

cliffa.
 
SirJoe17 said:
Hello Richard, we've got a 2013 961 with persistant start-up and idling issues, and we are proceeding to change as many sensors as we can get our hands on (after having read that virtually every sensor on these bikes is unreliable).
We replaced the Head Temp sensor, camshaft position sensor, and crank position sensors with Bosch units so far, and we ordered the Harley Davidson 27629-01A Throttle Position Sensor as recommended in this thread. However, it seems that the HD sensor spins in the opposite direction of the CTS unit fitted on the bike, so the bike idles super rough and instantly dies when you hit the throttle. As soon as we reinstalled the original CTS unit, it ran fine. We couldn't figure out why at first but then noticed that the two sensors spin in opposite directions (although the two parts look identical). The HD part was brand-new and sealed in the original box, just picked it up from the local HD dealer in town today.
Everyone in this thread seems to agree that the Harley part 27629-01A is a direct replacement, so we're super confused. Your original post was from 2018, so I'm wondering if anything has changed since.
Thanks very much for your time!
**Also, are you in Southern Ontario or Colorado? We're in Montreal!
Click to expand...
I have never used a HD TPS , the rotation may be wrong , but it looks the same as the CTS Norton part. Look at Magneti Marelli :

Magneti Marelli Type (PF1C/PF2C) Throttle Position Sensor Sealed, Spring Return Rotor Clockwise or Counter-Clockwise Rotation
Available .


Ordering information 101-130-00013 - Output D-Shaft drive orientation is 'Anti-Clockwise' when viewed from the mounting face of the sensor. 101-130-00014 - Output D-Shaft drive orientation is 'Clockwise' when viewed from the mounting face of the sensor.
 
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Honda CRV TPS's look the same but come in 2 flavours, clockwise and anticlockwise.

As for calibration you can either recalibrate using the proper routine or look at the ECU TPS voltage at fully shut on the old TPS before removal and then twisting the new one until you get the same voltage and then locking down. So on my last CRV TPS change I got fully shut voltage of 0.98V and then installed the new one and adjusted until I got 0.98V, no recalibration was needed.

Looking at the ECU reported TPS voltage also tells you if the TPS is faulty, the replaced TPS was showing 0.98V but with periodic jumps despite the throttle not being touched, telling me that was my odd tickover issue, a new TPS was 0.98V rock solid on a closed throttle and a good tickover.
 
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