1200 RPM...no way in hell

[Apexhitter]

So I've been posting here for a long time, had the TLS for almost a decade now. For at least half of that, from right around when I installed my Yosh exhaust, the idle has always hung at 2k RPM when coming off the throttle. If I try to adjust it, it will drop down to about 1K, but if I adjust it just a C-hair back up it will jump. So no big deal right? WRONG! It's made me nuts for years!! Every other month or so I would post here and get some ideas, then try them and still the same result. SO...here I am again, this time with a list of things I've already tried. For the love of GOD, please help me. Obi-Wanna-Idle-Right...you're my only hope!

Adjusted TPS (every time I do anything listed below, but I can never get the idle to stay at 1200 by any means, so I don't know if this might be the bad piece in the puzzle?)

Sync TB,
Replace all vaccum lines
Replace throttle body boots and gaskets
Remove PAIR system
Tried other ECU
Adjusted map via Yosh box
Checked TB stop gap
Cleaned and lubed throttle cables
Set Fast Idle lever

Wondering if it could be electrical? TPS bad?

[TLRChris]

Re: 1200 RPM...no way in hell

When syncing the TB's did you also adjust the idle on the TB's? and the Air screws as shown in the sync-video?
Also did you replace your fast idle cable? maybe it just hangs, could also be the routing of your throttle cables. Here a picture of my TLR tb's with screw locations. The air screws are used for balancing I believe (R doesn't have those) but it's been a while since I watched the video.

If your throttle always comes back to normal when engine off no matter what position your handle bars are in, then could possibly be a bad connection in the wiring to your TPS sensor or bad TPS sensor.
What I don't understand is how can you sync your TB's when your idle is not 1200? What shows dealer mode for the TPS? Sounds like a bad TPS sensor.

[Apexhitter]

Re: 1200 RPM...no way in hell

When syncing the TB's did you also adjust the idle on the TB's? and the Air screws as shown in the sync-video?
Also did you replace your fast idle cable? maybe it just hangs, could also be the routing of your throttle cables. Here a picture of my TLR tb's with screw locations. The air screws are used for balancing I believe (R doesn't have those) but it's been a while since I watched the video.

If your throttle always comes back to normal when engine off no matter what position your handle bars are in, then could possibly be a bad connection in the wiring to your TPS sensor or bad TPS sensor.
What I don't understand is how can you sync your TB's when your idle is not 1200? What shows dealer mode for the TPS? Sounds like a bad TPS sensor.

TBs balanced at a different engine speed. doesn't matter what RPM as long as vacuum is even, right? I can get the bar to move up when in dealer mode, but it's from around 1k to 1500 rpm instead of 1200 to 1500. I just can't get it to sit at 1200, no matter what.

[TLRChris]

Re: 1200 RPM...no way in hell

Does the engine run smooth? Can you adjust with the side screw, the one under the tank on the left side? Maybe it's stuck and the tubing that connects it to the adjuster came off or something. I mean it jumps from 1k rpm to 1.5k rpm? Did you change your plugs?

[zippytlsr]

Re: 1200 RPM...no way in hell

sounds like the idle cable adjuster is hung up, not adjusting smoothly. I'd take it out.. clean and inspect it. maybe put a light coat of cable lube on it and give it a try.

[GhostMAFIA]

Re: 1200 RPM...no way in hell

sounds like the idle cable adjuster is hung up, not adjusting smoothly. I'd take it out.. clean and inspect it. maybe put a light coat of cable lube on it and give it a try.

The one on my FZR was like this... it seemed like a few tiny turns would do nothing, then all of the sudden it went up too much. It ended up being gunked up and wasn't registering the small turns, but when it broke free it would jump too much.

Probably not the problem... but it's a quick and easy thing to check.

[Brat]

Re: 1200 RPM...no way in hell

the only thing i have to say is wow. nice you get better responses from here than a motorcycle shop. and these are tl specific suggestions. nice.

[cyclecamper]

Re: 1200 RPM...no way in hell

Oh, yeah.

LIke he said, only the TLS has the air idle air mixture screw (bleeds air when butterfly is closed), the TLR doesn't and relies on the butterflies being open a bit. Some TLS's had caps over the air bleed adjust screws...remove the caps and adjust and balance the idle mixture! The TLS should be able to be adjusted for a really nice consistent idle.

Make sure you're running on the ECU's idle maps when the clutch lever is pulled in or the gearbox is in neutral. Make sure that if you have a TRE it is a SMART TRE that maintains the neutral map function, not just a resistor; and make sure the GPS still works so the ECU knows it's in neutral, and the clutch switch still works. Pulling in the clutch should affect the engine running (Most people report a change in idle speed, not just lean/rich mix), and so should putting it into neutral. I'm no expert on this area, just read it so many times...

[Apexhitter]

Re: 1200 RPM...no way in hell

Thank you all for your input. I will be pulling the idle adjust cable and cleaning it as a first step. I think I will map back to stock and get rid of my TRE (old school with just the resistor between some nice plug ends). Then we'll start over again with TPS, TB balance. Will report back once that is complete.

[cyclecamper]

Re: 1200 RPM...no way in hell

get rid of my TRE (old school with just the resistor between some nice plug ends).

Oh yeah. Get a better TRE so you can retain the idle map differences. A simple resistor doesn't cut it except perhaps for racing.

[Big Red]

Re: 1200 RPM...no way in hell

Did you resolve this problem ?

[bedford4x4]

Re: 1200 RPM...no way in hell

So I've been posting here for a long time, had the TLS for almost a decade now. For at least half of that, from right around when I installed my Yosh exhaust, the idle has always hung at 2k RPM when coming off the throttle. If I try to adjust it, it will drop down to about 1K, but if I adjust it just a C-hair back up it will jump. So no big deal right? WRONG! It's made me nuts for years!! Every other month or so I would post here and get some ideas, then try them and still the same result. SO...here I am again, this time with a list of things I've already tried. For the love of GOD, please help me. Obi-Wanna-Idle-Right...you're my only hope!

Adjusted TPS (every time I do anything listed below, but I can never get the idle to stay at 1200 by any means, so I don't know if this might be the bad piece in the puzzle?)

Sync TB,
Replace all vaccum lines
Replace throttle body boots and gaskets
Remove PAIR system
Tried other ECU
Adjusted map via Yosh box
Checked TB stop gap
Cleaned and lubed throttle cables
Set Fast Idle lever

Wondering if it could be electrical? TPS bad?

My bike does exactly the same thing - it's very annoying. The idle adjustment cable needs lubrication, but I'm convinced that it's also mixture related, as it idles fine when cold or REALLY warm, but not when running at normal operating temp. It was exacerbated by disabling the flapper valve. So I believe that the bike is running too lean when at normal temp, but when cold, is running the richer cold map so idles fine, and when REALLY hot, is able to burn a lean mixture well so idles fine.

I'd adjust the idle air screws in or out by the same increments to see if it makes much difference. I'll be doing it myself.

[rufer]

Re: 1200 RPM...no way in hell

Faulty TPS is possible, I had that on my road TLS. The resistor value "jumped" right at idle and the bike was running a bit jerky.

Greetings
Rufer

[CWBethel]

Re: 1200 RPM...no way in hell

so have gone through two TPS's on my bike first would adjust out fine then go out of adjustment within minutes of putting everything back together verry frustrating...replaced it with used one that had dead spot just off idle (bike would falter badly on lite acceleration) but ran fine rest of the time. now just started getting intermitant FI light with C14 code (TPS issue) Grrrrrr!!

[Apexhitter]

Re: 1200 RPM...no way in hell

Cleaned some gunk out of the TB's around the butterflies....slacked off the throttle cables...seems to be idling at 1200 OK right now...we'll see!!