Certainly agreed adjusted as to specs, but as an interesting sidebar to that, I was just at the dealer today, checked all the bikes in the showroom,about 12 of them, I don't think any of them had the same throttle cable play, some were loose by about 1/2" on twisting the grip.(Like my bike when I got it ) I hope they readjust them before delivering the bikes......otherwise that makes for some pretty abrupt and jerky accelleration/decellerations.... But all the Ducatis and Triumphs had nicely adjusted cables.....
Originally Posted by voxmagna
...............What I did find however is that the throttle cable/TPS adjustment is important for the bike to warm up quick, too loose a throttle cable and it will stumble for a while until hot.
The throttle cable MUST BE LOOSE as in BMW spec. i.e free play at the twist grip.
The TPS critical adjustment is referenced when the throttle bar is against its idle stop. That reference is learned when you start the bike. You can only be sure the throttle bar is against its stop if there is free play in the cable, and on mine I hear a click when the throttle is closed and before the twist grip hits end of travel.
If you have no free play in the throttle cable, the ECU is getting the wrong reference voltages at startup. Worse still, if you take the bike to a dealer for diagnostics, they may try and sting you for a new TPS or worse than that adjust the TPS without checking the throttle bar is on the stops by first slackening off the twist grip cable slack adjuster. You/ they can also screw up if the steering is on hard lock and pulls the throttle bar off its resting stops.
There should be sufficient slack in the throttle cable that when swinging lock to lock at idle, the throttle bar stays on its mechanical resting stop and there is no change in idle rpm.
The reason I know about this is shortly after getting my first K bike I saw the slop in the cable and took it out without reading the manual so it was like all the other bikes I'd ever owned.
Then I started getting idle problems, low gas mileage and sooting on the muffler spout. Took it in for 1/2 hour diags and stood there watching the computer. Up comes a bar display for the TPS adjustment and mine was showing in the red at idle.
That's your problem says the stealer - new TPS at mega bucks, or out of adjustment. Thinking quickly about what I'd done recently on the bike, I slackened off the throttle cable and watched the TPS voltage settle back in the green. Now don't you think the tech. would have checked that first?
Here's the BMW spec. for my KRS:
Preset Throttle play with engine cold to 1.5mm (0.06 in)
Warm the engine until the radiator fan starts to run and adjust the throttle play to 0.5mm (0.02 in)
They don't say anything about rocking the steering lock to lock, so I would regard those free play figures as absolute minimum and allow for play at the end of each lock. Depending on how well the throttle cable is routed under the tank, it has a habit of moving with the steering. Even those spec. figures translate to more angular rock on the twist grip than you might expect.