Adjust your TPS

[Hooli]

Air leak.
Check all the small vacuum pipes, including the fifth one for the pairs valve. They go brittle & split with age, when they get really bad low speed running is terrible too.

[Alexandromeda]

Been out. Seems to be running smoother. Still cut out after a long straight and then a quick stop for junction. Starts  back up straight away. Not done STPS or changed plugs yet. Also did not reset TPS with ECU. Not done fuel pump filters. So do I need to go to another thread?

[grog]

Alex, hard to advise when we dont know maintenance/ adjustment history. New plugs,clean fuel system,balance throttle body, adjust tps,stps, idle speed.Adjust throttle cables.New air filter, check vac hoses, spray of brake cleaner around intake will find leaks.Thats about it from memory, takes a bit of effort but result is long lasting& makes a lovely ride. 👍

[Alexandromeda]

Bike rides fine when going steady. It seems that after a fast straight and hard on the brakes blipping throttle and changing down. Sometimes it cuts out. I have changed the can and link pipe for MTC. It had these symptoms before the can swap but not as often. Pairs is intact. New OEM air filter. TPS set from 1240 to 1136. Trhottle bodies balanced. I don't ride too often, sometimes weeks between rides. Not done plugs or tank filters. Milage is 24700 miles.

[Alexandromeda]

K7 FE MOVED to another thread.

[BaNZ]

I think it's kinda general question of TPS setting.

Long story.

I adjusted valves and synchronized throttle bodies, so bike idles and runs very well. There was one liiiiitle problem I was planning to deal with later: fast idle was to fast and too long. It was around 2k rpms for 5 minutes or so.

Since then I disassembled engine a little to make new thread on top of camshaft journal holders. Assembled it back (I touched NO ANY electrical components! Did NO ANY adjustments) and it was a problem to start. Okay, I started it in the end. Decided to adjust TPS and STPS and fast idle. I know procedure, I did it a lot of times, but didn't pay much attention to it. So there is questions.

1)Should TPSes be set by voltage or by resistance? (No difference, right, heh?))

2)How is it possible to set TPS for 1.1v/1.1Kohm closed and for 1.12v for fast idle at the same time? If I set TPS for 1.1Kohm closed in turn-off state, there is only ~0.957v on TPS when bike is turn ON.

3)What am I doing wrong as I can't set TPS at 1.195v when open secondary throttle valve? I could turn out fast idle adjustment screw up to 1.105v or so unless I set TPS specifically to 1.12v for fast idle in closed position.

4)Some members mentioned, that throttle bodies could be "overadjusted" in synchronizing procedure. So it could produce such problems, that I'm experiencing. What does it mean and how is it possible to "overadjust" throttle bodies?

The current problem is rpms doesn't lower smoothly. It's kinda freeze near idle speed 1100-1500 for some time, then drops. Idle floats a little and can't be adjusted for 1100rpms via throttle idle screw. It could be set too high (1200rpm and above) or too low (1000 rpms and below). Revs up normally. Rides kinda okay, but bike don't want to stop because it can't low rpms to idle speed rapidly. If I set idle to 1000, engine tends to stall under load on low revs and there is some hesitation in 1000 - 1500 rpm range occurs.

As I understand, I should set TPSes right and adjust fast idle screw properly, as it the only thing that connects primary and secondary throttle valves.

I checked all sensors as per manual. No faults. I even boiled EOT sensor - it's readings are fine.

[Hooli]

There is a 'fast idle' adjustment screw, you'll find it in the centre pointing at the secondary throttle motor as that turns backwards to control the fast idle. The procedure to adjust it is in the workshop manual but I've only ever got it to work by trial & error.

[BaNZ]

Yep, I know where fast idle screw, but I can't adjust it properly. There is 2 variants:

1)I set TPS for 1.1v closed on switched off bike. And I can't set 1.195v by fast idle adjust screw in secondary valves open position after that.

2)I set TPS for 1.12v "closed" on switch on bike, as fast idle adjustment procedure required, and I can set 1.195v by fast idle adjust screw in secondary valves open position, but TPS closed position will be not 1.1kOhm in such case.

[Barbastro K6]

Good help friends. I hope to be at that level Asap

[Hooli]

Yep, I know where fast idle screw, but I can't adjust it properly. There is 2 variants:

1)I set TPS for 1.1v closed on switched off bike. And I can't set 1.195v by fast idle adjust screw in secondary valves open position after that.

2)I set TPS for 1.12v "closed" on switch on bike, as fast idle adjustment procedure required, and I can set 1.195v by fast idle adjust screw in secondary valves open position, but TPS closed position will be not 1.1kOhm in such case.

Ahh, ok.

Voltage is more important, the resistance is a base setting so the voltage should be 'about right'. It's the voltage the ECU works with so that's the more important figure.

[Will14]

Yep, I know where fast idle screw, but I can't adjust it properly. There is 2 variants:

1)I set TPS for 1.1v closed on switched off bike. And I can't set 1.195v by fast idle adjust screw in secondary valves open position after that.

2)I set TPS for 1.12v "closed" on switch on bike, as fast idle adjustment procedure required, and I can set 1.195v by fast idle adjust screw in secondary valves open position, but TPS closed position will be not 1.1kOhm in such case.

I have had a similar issue in the past & it took me an age to get things set up properly. Firstly the manual I think states not to adjust the fast idle screw, it is set in the factory although there is a procedure in there to set it up. If I recall correctly the figures for setting up the TPS are stated in Ohms but the figures for setting up the cold idle are in Volts. As Hooli has already mentioned trial & error worked best for me, although I had everything set as per the manual it still wasn't working as it should, a quarter of a turn at a time on the fast idle screw and I eventually got it spot on, the biggest pain is having to wait between each trial for the motor to completely cool down after each adjustment/trial start up

[Andre]

I think that trial and error was how I got it right (after setting it up as per instruction).

[grog]

Trial and error, ambient temp makes huge difference and cant be controlled. My Summer min around 20c, no fast idle. My Winter varies but 5-15, maybe 30 seconds.

[BaNZ]

Well, as it appeared, STPS was set for 0.6v instead of 0.8v closed. After correction rpm behavior became much more predictable. Don't know how fast idle works, as I didn't wait for engine to cool, gonna test it and play with TPS voltage next time.

And as I discovered, it's more reliable to set TPSes via voltage, but not resistance.

[MickyJB]

Hi, I finally got around to checking the TPS with a meter .. followed the instructions and on a closed throttle it was measuring out at 1.104 .. moving the sensor didn't make much difference at all. I then tried with throttle wide open and no change to the meter at all . 

That's as far as I went .. my workshop manual goes on about turn ignition on and check for output voltage using the multimeter ... but I didn't do or fully understand that. The TPS adjustment is so minor on the turning it barely changes the meter reading.

Bike revs cleanly, it just feels a bit jerky when riding slow 

Filters / pump etc all got changed or modified a while ago