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Old 07-07-2006, 01:39 AM   #1
boxas2003
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setting high idle speed - why not?

First of all, hello to everyone as this is my first post, though I've been reading for a couple of months.

I read in one of Keith Code's books that he would sometimes suggest racers to set their idle speed very high (4K rpm IIRC) to avoid engine braking. This got me thinking, why not use this on the street too? The way I see it you have several benefits:
1. Throttle action should be less sensitive, especially in 1st gear (this was also mentioned in one of the threads yesterday).
2. You don't use engine braking (not sure if this is good, but Keith Code seems to think so).
3. If you get scared mid-corner and chop the throttle off, it won't be as bad.
4. In stop-go traffic, you don't really need to give any gas, you just ease the clutch out.
5. You can't stall the engine.

Having said all this, I have very little experience with bikes, so I might very well be very wrong in the above. But if not, why don't we just increase our idle speeds (other than due to increased fuel consumption)? It must be obvious, but I can't see it.

Philip
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Old 07-07-2006, 01:48 AM   #2
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I would feel stupid at a stop light with the engine turning 4k. That's just me though.
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Old 07-07-2006, 02:03 AM   #3
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Well you don't have to put at it at 4K. That was just the number in the book for racing. How about 2K?

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Old 07-07-2006, 02:09 AM   #4
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Quote:
Originally Posted by boxas2003
1. Throttle action should be less sensitive, especially in 1st gear (this was also mentioned in one of the threads yesterday).
2. You don't use engine braking (not sure if this is good, but Keith Code seems to think so).
3. If you get scared mid-corner and chop the throttle off, it won't be as bad.
4. In stop-go traffic, you don't really need to give any gas, you just ease the clutch out.
5. You can't stall the engine.
Philip
1) throttle sensitvity will not change, the bike will continue to accel slightly even with the throttle relased, not a good thing on the street...
2) engine braking is good at street speeds...
3) it will be worse since you will chop off the throttle and the bike will still accelerate, causing you to be more scared and panically grab at the brakes...
4) In stop and go traffic you will over heat....
5) youcould stillstall the engine.....

In all of your sujestions above, basic riding skills will work 100% better than upping you idle speed, it works on the track because of the higher corner speeds and much more aggresive riding.....and you will look stupid with your idle up that high on the street....
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Old 07-07-2006, 02:37 AM   #5
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wish i could turn my idle up that high with out all the work too do sooo but thats for stuntin
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Old 07-07-2006, 03:05 AM   #6
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Quote:
Originally Posted by davedog665
wish i could turn my idle up that high with out all the work too do sooo but thats for stuntin
uhhh....... all you have to do to turn the idle up is turn the little idle dial thingy. I wouldn't recomend it though.
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Old 07-07-2006, 11:01 AM   #7
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Quote:
Originally Posted by TOMIMOTO
uhhh....... all you have to do to turn the idle up is turn the little idle dial thingy. I wouldn't recomend it though.
Thats not an actual idle adjustment screw, its an air screw. It richens up or leans out your mix which makes the idle move around but you cant get it any higher than about 2400RPM. Another stock 600RR, 900RR, etc air screw must be installed on the throttle bodies replacing the throttle butterfly stop to have a true idle adjustment. Trust me, us stunt nerds know far too much about the idle adjust mod: http://www.600rr.net/vb/showthread.php?t=47221
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Old 07-07-2006, 02:51 PM   #8
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Quote:
Originally Posted by lowlife
1) throttle sensitvity will not change, the bike will continue to accel slightly even with the throttle relased, not a good thing on the street...
2) engine braking is good at street speeds...
3) it will be worse since you will chop off the throttle and the bike will still accelerate, causing you to be more scared and panically grab at the brakes...
4) In stop and go traffic you will over heat....
5) youcould stillstall the engine.....

In all of your sujestions above, basic riding skills will work 100% better than upping you idle speed, it works on the track because of the higher corner speeds and much more aggresive riding.....and you will look stupid with your idle up that high on the street....
1a. I believe throttle sensitivity will be better in the sense that when you turn the throttle completely off you don't get jerked as forward due to as severe engine braking.
1b. I don't see how that's a bad thing. I would think of it as having an automatic car versus a manual car, in the sense that you're always slightly accelerating. This could even help with incline starts a lot.
2. I don't see why, and I've read quite different opinions about this, but if you know why, I'd like to hear it. I think I read somewhere, use the engine to accelerate and the breaks to decelerate, and it makes a lot of sense to me. You even avoid the danger of using engine braking, hence not lighting up your brake light, hence having someone rear-end you.
3. It won't be worse because chopping off the throttle is much more of an instinct reaction than applying the brakes. Also you will sense the deceleration and probably won't feel the need for more. But this is purely hypothetical, so I don't know who is right.
4. This is a good point.
5. I don't see how. Again, it's like having an automatic car. The engine never stalls there.

Philip
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Old 07-07-2006, 03:01 PM   #9
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Philip, I have to agree with lowlife and the concensus here. This is a bad idea and a recipe for disaster. Your concerns can be resolved with riding skills. Engine braking is your friend. Drag your front brake lever when you're engine braking so your light flashs at the driver behind you. You should be covering the brake levers anyway when you're braking, whether it be with the engine or the brakes. You better not rely on a brake light to prevent the cager behind you from running you over. You better be watching them and have a plan of escape just in case.
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Old 07-07-2006, 03:31 PM   #10
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Yeah... I don't really feel the need to travel down that road. Just learn how to handle the bike better.

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Old 07-07-2006, 04:15 PM   #11
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Be careful turning the idle adjuster up as far as it will go - my cable has an annoying habit of jamming in that position and needs mole grips on the end of the cable at the throttle bodies to free it off again if you want to lower the idle speed again. And as already mentioned it only takes idle up to around 2500 rpm anyhow.
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Old 07-07-2006, 04:15 PM   #12
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Quote:
Originally Posted by boxas2003
First of all, hello to everyone as this is my first post, though I've been reading for a couple of months.

I read in one of Keith Code's books that he would sometimes suggest racers to set their idle speed very high (4K rpm IIRC) to avoid engine braking. This got me thinking, why not use this on the street too? The way I see it you have several benefits:
Pretty sure the book was referring to the track and not the street, but that's just how I see it. He might be referring to street racers, who knows.


ya I'm an ass.
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Old 07-07-2006, 04:26 PM   #13
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Quote:
Originally Posted by APEX_600RR
Thats not an actual idle adjustment screw, its an air screw. It richens up or leans out your mix which makes the idle move around but you cant get it any higher than about 2400RPM. Another stock 600RR, 900RR, etc air screw must be installed on the throttle bodies replacing the throttle butterfly stop to have a true idle adjustment. Trust me, us stunt nerds know far too much about the idle adjust mod: http://www.600rr.net/vb/showthread.php?t=47221
cool man thanxs for lettin him know whats up! im not where i need to b yet to need 3 or 4k idle but it would b nice to not have to do all the work but i hear that it looks worse then it is?
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Old 07-07-2006, 05:02 PM   #14
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Mostly it seems like a waste of gas to me...
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Old 07-07-2006, 06:26 PM   #15
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I'd so no to street riding, I run mine around 2k at track and seems to work good,but I also have a slipper clutch.
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Old 07-07-2006, 08:37 PM   #16
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Ok guys, thanks for the replies. It seems you all agree, so I'll take your advice.

Philip
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Old 07-08-2006, 03:18 AM   #17
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smart man....
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Old 11-14-2010, 01:03 AM   #18
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1.) waste of gas
2.) more wear on the clutch
3.) noisy
4.) have to hold clutch more
5.) too many cons to list
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Old 11-14-2010, 01:05 AM   #19
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thread revival
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Old 11-14-2010, 04:25 AM   #20
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thread revival
How the hell did you find this?
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Old 11-17-2010, 02:20 AM   #21
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How the hell did you find this?
truth is......i just dont know.
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Old 11-17-2010, 02:40 AM   #22
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truth is......i just dont know.
Fair enough...
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