KX Riders
General => Riding Tips & Tricks => Topic started by: steeldust on October 08, 2004, 09:24:42 AM
-
A friend of mine sets his idle screw so low it wont idle so he always has to start if he lets go of the throttle. The reason he does this is because its a race bike thats what he says(stock rm 250 with pipe and silencer). He couldn't give me a good reason why he won't let it idle. The only reason I can think of is if he wrecks the bike it wont keep running and hurt the bike or himself. I know I always get my bike to a low idle. Any ideas or this guy full of BS?
-
I'm sure somebody here can answere the question, but mainly cause of surging, when you rev a two stroke, it risks a small surge when returning to idle, so if you let off the throttle after a wide open run, it will surge lightly and if you are flying into a corner for a slide, it will cause it to surge in the corner and really cause issues. So they say.
-
If you look on the factory spec sheets for the 5 hundie it is set up not to idle from the factory prob for the reasons above
-
On a two-stoke, eliminating the idle increases throttle response. If you're a pro, you'll notice it. The rest of us will stall.
-
Arigato,
I gotta ask how on that one. All idle is is a stop that doesn't let the slide bottom all the way. Shouldn't change throttle response unless they set the air screw differently. Am I missing something?In my pro days I always wanted an idle so you didn't have to restart if you fell off. Cam.
-
Arigato,
I gotta ask how on that one. All idle is is a stop that doesn't let the slide bottom all the way. Shouldn't change throttle response unless they set the air screw differently. Am I missing something?In my pro days I always wanted an idle so you didn't have to restart if you fell off. Cam.
Exactly, especially when hot and muddy! There is nothing worse than a muggy hot day in the mud being roosted in the face trying to restart your bike.
I used to race alot on my 250 and always kept an idle. What I don't like is stalling in the air off a 100ft double!!!
-
After speaking with several engine tuners I stand corrected. Sort of. The CR500 (the bike I had before the KX) runs older style PJ Keihin carburator that incorporates the idle adjustment and the choke together. This makes for a delicate balance between proper idle and flooding the motor with fuel when the throttle is opened up...On KX's with the PWK carb, this is not an issue. Some mechanics still set the idle to 0 to be sure that the motor does no overrun when going into corners. Set your idle where you want it, and don't forget the wasabi.
Arigato
-
Burn baby Burn!
-
I like when a bike idles.. it sucks when you are trying to adjust your goggles or something of that sort and the bike putters out on you. Think about the races with the 2-strokes and some 4-bangers where the mechanic/riding coach is at the the starting gates and has to keep the bike running for the rider while he is getting ready. Unless you are seriously into racing and ultimate performance, the idle/no idle is a pretty insignificant power issue I would imagine (but I don't race).
But as far as the idle issue on my bikes? I like idle. I just got my KX5 motor/carb back from the motor builder that we all use here in Vegas. I did a reinforcement mod to my rads in the meantime and should test it on the next trip with a report to follow. Anyway, I put the bike back together, added fluids, and the bike started on the second kick ! Warmed it up a bit, shut it down and restarted it a few minutes on the first kick. Now this is not a stock motor anymore. Head decked with thin squish for higher compression, ported cylinder and intake/exhaust ports. The PWK was ported to about a 41mm with other custom work that is semi-secret to the builder. If you hold the carb up to the light you can see through on both sides of the slide. So with that being said, I didn't even adjust the idle screw from the position I sent it off at and the bike selted down into a perfect purr of an idle. Did I mention that I like idle :roll:
Just some reteric from myself... Sly
-
I like idle.
-
I like a relatively high idle on a stroker cuz I'm always paranoid of it dying on me. [had it happen too many times.] That and I've got less of the rev range to cover before I'm in the power. :evil:
-
I still like idle... yep.
Sly
-
I too am a fan of bikes that idle. Nothing is more frustrating than coming down a steep white knuckle hill, trying to maintain some sort of control over a bike with the rear-end wanting to go first, while you've got a death grip on the bars, wondering if your going to avoid the trees, and then bike wants to stall because it won't idle.... :x
Did I mention, I too like bikes that idle...
-
Quite a few different opinions on yea or ney on an "idle". My .02, is for MX'ing you do NOT want an idle. When you create an idle, you also create an extended "hang time" in engine rpm's when abruptly decellerating. This causes added "drive" entering corners that is not wanted. Most pros litterally come into a corner so fast, they drag the rear brakes, and many times stall the engine, immediately let the clutch back out, and the drive restarts the engine. No idle creates an immediate, consistant "chop" in rpm's.
-
Hey, if that's the (only) definition of a pro; I am defenatly a pro! The number of times I stalled in corners... Most of the time the enginge fires up again using the resident momentum of the rear wheel.
My 125 idles and my 500 don't. This is deliberate due to the case of nasty KX500 kick-backs I have.
I never stall when I ride the 500 on tarmac/Motard..? Could be that I am too busy trying to stay alive?
//John
-
I like idle
Serafin
-
I am defenatly a pro! (John)
Hehehe, that's funny. Me too, me too!
When you create an idle, you also create an extended "hang time" in engine rpm's when abruptly decellerating. This causes added "drive" entering corners that is not wanted. (Polar-Bus)
So is this a 500 thing or a two-stroke in general thing? I am thinking about how I ride and feel that I must be doing something wrong then. I use my clutch quite a bit when entering corners to remove drive and use the brake(s) to control speed. So if more veteran riders actually kill their bike going into turns or the like, then even though they have no idle they still have too much drive then?
Too bad about bump starts, my bike has too many tough ponies to drag start it in the sand. :wink: Sly
-
Back when 125's and 250's were "kings" using 2 stroke engine braking was a consistant way to dive into a corner. Dragging your rear brakes hard, many times causes unwanted rear wheel "hop" Many times your engine would stall. Simply letting off the rear brake would allow the engine to bump, and restart. This was very easy on 125's, and slightly less common on 250's. This method would be impossible on a 500!! Even with the addition of my flywheel weight, I still stall my 500 in corners trying to "drive in" hard. The 500 simply likes smooth, and definately clutch pulled. On my 500, I prefer an idle. Running race fuel, and jetted spot on, I have only a minimal amount of the common rpm "hang time" declellarating. It was VERY prominent when my 500 was bone stock.
-
i like bikes to idle and to not idle it depends on were im riding and the size of bike i would agree that the bike stalling in corners is what the pro's use and they like no idle cuase the bike surges going in the corner it causes a imbalance in crank case pressure and makes the throttle responce coming out of a corner not predictable some situations could cost u a possition on the track if the bike falls on its face because all the built up fuel from lettin off the throttle if your goign at a good pace u dont notice it but goign from 30 to 5 and downshifting 2 gears to nail the next section thats when u feel it we dont feel it on the bike kx5 because we could almost tip a gas can up and let it go down the carb and the bike would still run but the 125 and the 250 are smaller motors i guess what im saying is if u nail the brakes goign into a corner the throttle closes all the way the motor has burnt up all the extra fuel u can crack the throttle 1/4 half whatever u preffer and it will come straight to life with the idle turned all the way down basically everyone knows lean is fast fat is slow get the concept ive almost confused my self here if your not bubba stewart you dont need to worry chances are the next guy will miss a gear and u will be back out front anyways! nick from michigan
-
I like idle
-
I prefer to idle as well. It just makes everything easier if your bike idles. You can make adjustments, you can put on your helmet and goggles, etc...
-
I have never had a 2-stroke that idled. I turned a 250 up to where it idled but didn't like it. As has been stated, when you let off the gas after having it the mid to upper revs, it wouldn't immediatly idle down. Even going from 3/4 to 1/2 there would be aome hangover. Sure it makes putting goggles and gloves on while warming the bike up a little tough but it's something you get used to and find ways to make it easier. My bikes don't idle but I work for a 65 and 85 racer and right now I set his bikes up to idle. Those bikes don't have the response effects and for a younger rider who might go down it's a good thing to try to keep it running.
-
I trail ride and some of the single track I ride have gates. It's nice to have the bike idle while getting off to open and close the gates.
-
I like idle for start, and warm up. Once it starts to warm up, I push the choke off and let it idle till the exhaust runs clear. Then I turn the idle down/off and ride. I am no pro rider, but I prefer to use engine braking and some drag on the rear brake when entering a high-speed turn. Nothing worse than flying through the desert at ludicrous speed and picking up a turn late, Dropping a gear and gracefully power sliding into it just to have the engine bump the rear wheel and mess everything up.
I guess I go both ways:>)
-
My "old" 04 rmz250 Idle'd about 3500rpm for the first year. Had to much
engine brake for me, and it started much much better when hot!
My 125 and 250 2strokes stopt after 5-6 sec of idle. Than it won't
shut of when riding, and doens't feel like a runawy train. Like a cr500 I've
ridden ounce. Thats no fun when going into a corner :-(
Just do what feels best. Its good to try new(or old) things.
Dutch
-
No idle for me. Never had it never will.
-
Dang, I just thought the guy who owned my bike before me didn't understand the carb enough to make it idle. I never knew people purposely set the bikes up to not idle! The reasons given do make sense though. Maybe I will leave it in its non idling state.
-
honestly if love the idle just because I hate kick starting the kx5.
Guess that will change after I get used to it.
What am I saying.
That won't change. I don't even like to kick start my little 80.
-
YES, idle.