TPS

[John_FJ]

Hi guys, I have just balanced the carbs and then checked the TPS, the reading was 10, I read on here it should be 5 so I have adjusted it to 5.Looking through the Haynes manual it says the 5 setting is for bikes before 2003 and the later bikes you have to measure the resistance on the wires.Does anyone know if I have done wrong?Cheers John

[Falcon 269]

Not sure why Haynes say there should be a different process post-2003 unless something has changed inside the ECU from that year onwards.

The TPS is a simple device which tells the ECU how far the throttle is open and the rate at which it is opening or closing.  I'm pretty sure that the Owners' Manual instructions for setting it remained the same throughout the production life of the bike.

Check out Pat's Site and consider trying Ivan's dynamic (engine running) method for setting the TPS.

http://www.cartestsoftware.com/fz1/throttlepositionsensoradjustment.html

FWIW, I set mine by adjusting the unit so that the tacho needle bounces between 5 & 10k rpm.  In this way, I've slightly advanced the ignition curve from idle to point where max advance is applied by the ECU, which is around 5.5k rpm, IIRC.

[ProdigalSon]

Ok I'll show my ignorance, why is there even a throttle position sensor on a non fuel injected bike? 

[PieEater]

Ok I'll show my ignorance, why is there even a throttle position sensor on a on fuel injected bike? 

It's not a fuel injected bike 

[ProdigalSon]

I actually meant non fuel injected bike, why do you need a TPS on a NON fuel injected bike? 

[old son]

Because if you disconnect it the bike wont run!!

[Falcon 269]

I actually meant non fuel injected bike, why do you need a TPS on a NON fuel injected bike? 

Like I said earlier, the TPS tells the ECU how far the throttle is open, whether it is opening or closing, and the rate at which it is doing the latter.
The ECU uses this data, together with rpm and - possibly - coolant temperature to determine the ignition timing and the operation of the EXUP valve.

[ProdigalSon]

Ah ha, so linked to the Exup valve, thanks Mike for actually coming up with a non patronising answer as if I had known I wouldn't have asked. It's been a long time since I've had a bike with carburetors and they certainly didn't have them on the bikes I did have back then. 

[John_FJ]

Thanks for the replies guys