Adjust your TPS

[gsxbarmy]

NOTE: This thread is also available to download as a PDF file from the Downloads (General) Section

How to adjust your Throttle Position Sensor (TPS)

It is worth checking your TPS, your bike will run a lot smoother if it's out and readjusted. The TPS is a variable resistor (which is a coil of resistance wire with a wiper on it) and the wiper loses tension over time which increases resistance a little.

Adjusting your TPS

1.   Set your idle RPM to 1100 RPM.

2.   Take the Fuel Tank off

3.   The Throttle position sensor is to be found on the left hand side of the throttle body, the connector runs up in front of the air box in between numbers 2 & 3 cylinders, you have to disconnect the 3 pin connector with ignition off (it's in a bit of a tight spot and you might need to cut a few cable ties

4.   Using a multimeter, read the resistance of the TPS between the yellow and black terminal, it should read 1.1 Kohm or 1100 ohms with the throttle closed and 4.3 Kohm or 4300 ohms with the throttle open. (It helps if you can make up a connector or use some small alligator clips on the pins to free up your hands)

5.   To adjust, you loosen off the two screws and turn the TPS, most people run out of adjustment on the lower end, mine stopped at 1140ohms but the bike runs fine, my top measurement was also out but the bottom one is the one you want as close as possible.

Some people have pulled out the brass collars to get more adjustment and others have needle-filed the female holes on the TPS.

[RickC]

The check above is a basic extract from the workshop manual.

AlfaDave from the old forum suggested a couple of tweeks on this procedure.

1. Remove seat and LH side cover.
2. Disconnect large grey connector from under LH side cover.
3. Measure resistance between pins as shown on the top connector as per picture.
4. Resistance at closed throttle should be 1100 ohms or 1.1 Kohms, throttle fully open should be 4300 ohms or 4.3 Kohms.
5. Loosen the two anti tamper screws on the LH TPS and adjust to bring resistance into range (the bottom value is more important than the top value).
6. Set RPM to 1100 (manual) or 1200 (AlfaDave).

Throttle Position Sensor (TPS) gives an electrical representation of where the throttle is (1100 ohms closed), the TPS is a variable resistor which has  a wiper arm moving over a coil of resistive wire, if the TPS is not correct fuelling is adjusted by the electrical position which differs the real mechanical position of the throttle and causes numerous running problems.

[froudy]

@RickC

Now that method appeals as it saves removing the tank and trying to get to the TPS plug in amongst the throttle bodies..Much easier

[Jay]

is this picture (arrows) correct? Just zoomed  and it looks  3 doesn't have a pin. checked on my 14 and no pin at 3rd position. Is  perhaps be e other way around?
Or is my 14 abnormal haha probably...

[KiwiCol]

Yeah, maybe it's the pins at the bottom of that pic, not the top?

[Beaker]

Maybe a stupid question, but when you loosen the screws on the TPS and "adjust the TP sensor", what are you actually doing? Rotating, moving the TPS in some way??

Am yet to even lift the tank but would like a better understanding of what is required.

[froudy]

Maybe a stupid question, but when you loosen the screws on the TPS and "adjust the TP sensor", what are you actually doing? Rotating, moving the TPS in some way??

Am yet to even lift the tank but would like a better understanding of what is required.

YES..You are rotating the TPS Beaker

[Beaker]

Thanks froudy!!

[Jay]

well, followed this and it made a difference - good stuff. I did need to read the resistance from the male plug though, not the female. Does the secondary TPS need to be adjusted too? Thanks guys...
J

[RickC]

Good work Jay,

I did check it but I may have made a mistake.

I'll recheck mine and amend the picture if I've screwed up.

Cheers,
Rick

[froudy]

I haven't done my STP Sensor yet, but this should help Jay

[RickC]

Picture and plug corrected.

Sorry for all of the confusion.

Good pick up Jay.

[RIZLA750]

Hi guys, just checked and adjusted the tps,  how much out does it need to be to make a difference?
Mine was reading over 1750 ish adjusted to 1130. Not been out and checked the bike and wuz wondering
How much 600 ish  ohms will make.
Cheers guys.

[froudy]

I would imagine 600 Ohms will make a noticeable difference to how it runs

[RIZLA750]

Been out for a spin, and I am sure she,s running smoother.do you need to adjust the one on the right hand side?