1995-97 rm 125 idle speed

[92rm125]

Just got an 1995-97 rm 125, but it wont idle, it just keeps on stalling. there are two adjusters on the carb, how do i know which one adjusts the idle? i dont want to fiddle with them and screw the carb up. help!!! thnx

[Pretendo]

it should be the spring loaded plastic screw righ in the very center on the left side of the carb. the other little tiny screw that sort of hidden outa the way is the air pilot screw. that one is most likely comfortable at 1 1/2 turns out from all the way bottomed inward. set that screw at either 3/4 of a turn to 1 1/2 turn. the further out u drive that screw the leaner the the jetting gets for the very low speed circuit. its the only other screw that woud be concerned for idle. make sure u note what setting the screw is at before adjusting. like at its current position, you should turn it inwards and count the turns till it bottoms out so u know what the origional setting was.

[92rm125]

Ive adjusted the idle screw in and out, and nothing happens.... i have found a way of making it idle, by adjusting it on the handle bars, but it leaves NO throttle play tho... any other thoughts? does the carb need cleaning?

[RoostRM125]

New throttle cable.

[Pretendo]

I dont think that the throttle cable is at fault the cable has nothing to do with the idle, unless it was idleing way too high and the throttle was getting stuck open. what hes explaining is that he has to adjust the cable stop on the throttle housing to get it to idle.

most of the issues were due to the fact that the clutch never 100% disengages and it drags. if u notice that when you kick it into gear the bike gives a little jump regardless on how well the clutch lever is pulled in? most suzuki's are subject to this little design flaw. not all suzukis do it, just most. basicly you probably would not want to have it where your throttle cable is so far overdrawn that it simulates you holding the throttle in that exact spot. there are several things you could try, but mostly suzuki's are a pain to have idle. i bet it idles good in neutral... figure out if its doing ok for idling in neutral. then get back to us... gl

[92rm125]

No the bike doesn't jump. It just will not idle at all, i have to hold the throttle open stightly to stop it from stalling. In fact the guy i bought the bike off said that 2 strokes are not mean't to idle. but thats just stupid, corse bikes are mean't to idle!

Someone also sed it could possible be down to the pilot jet??

[Pretendo]

ok, and um not supposed to idle? haha what do u think the idle screw is for haha. ok the next step is to check the float bowl adjustment.

-do you have a manual?
-do u need a step by step?
-what do you mix your premix at?
-how do you ride your 2 stroke? are u constantly on the pipe and ringing its guts out at every waking moment, or is it less than that?
-how is the color on the sparkplug? picture please

with those questions awnsered i would be able to tell you with in reason the + or - that the float bowl level should be setas opposed to factory oem settings that the book sugests, but thats somewhat of a sketchy method.

ride it and warm it up. as soon as its warmed up to about as hot as its going to get, ride it as you would normally ride it on a good day for a good ammount of time (i.e aprox. 15-20 min) pull the plug and check the color of the plug and take a picture of it. then get a new plug in there and hold the throttle at about 1/4 throttle, even go ride it at about 1/4 throttle for a while.
then use the kill switch and check the new plug color and get a really good picture of it. if it doenst have enough color to it to make any sense to take a picture of, then ride it for a bit longer.

once u can get back to me we can get your bike jetted VERY close to perfection, which is hard to do over the internet This might seem like alot of work, but if you desire a finely tuned machine that will hopefully perform better, assuming that jetting is the reason that it wont idle, we can work together and "pimp your ride"

any other thing that might affect the idle is chipped, cracked reeds. i kinda doubt this, but it is very possible. lets take it one step at a time, and if u have the carb off, check the reeds, it wouldn't hurt to besure so we dont jet the bike to bad reeds

good luck, and i hope this wasnt overboard, im known for that. sometimes i can be a perfectionist with the tuning aspect of the mx bikes, even if there not mine hah.

[92rm125]

Wow, talk about helping someone. that is the most detailed responce ive ever seen! lol

Ok, no i dont have a manual but im trying to buy one.
what do you mean by step by step?
Its running 25:1
Im not an agressive rider at all.
Ill try and upload some pics soon of the plug, once i find the camera!

why is the colour of the sparkplug necessary? sorry if this is a stupid question, but im a newbie to motocross bikes and riding.

[Pretendo]

i believe that the mix ration you run is a bit on the heavy side. using a large ammount of oil will have the bike running a lil more lubricated, but its only nessasary that the bike have whats needed since its not getting romped on so horribly, i reccomend 32:1-40:1, I hurt the 125s and i run 32:1 it might be good for you to run 32-36:1 on a hot day and 36-40:1 on a cold day.

step by step as in complete dis-assembly and adjustments to the carberator that may be needed for the non mechanic savvy. (i should charge money for this stuff haha)

the color of the inner porcelin near the tip of the spark plug will get carbon build up. its what surrounds the electrode. with this carbon build up, you will then determine the approximate heatrange and fuel to air mixture that your bike may be experiancing. alot of bikes tend to have idle issues due to way too much oil in the fuel, or mal tuned air to fuel mixture ratio. It would most likely be to much percentage of fuel to air in your one unit of intake for the motor compression. this will "load up the engine" at a low rpm, causing it to perform poorly and become fuel inefficiant like a car might. The color will tell me about how much fuel to air your bike might be seeing. it bakes the fuel oil mixture on the porcelin at a certaint combustion chaber temerature. its like leaving a pizza in the oven too long, it gets too hot and burns, or not long enough and is soggy. basicly there is a color zone that tells you peak performance is near. a really black wet oily looking plug will normally mean too much oil to fuel and or possbily both too much fuel to air per unit of intake. pretty much the motor takes its set unit of volume of mixture per compression stroke. the carb just meters the ammount of fuel per usable volume unit that the motor draws. we are gonig to fine tune the fuel metering system (Carberator tuning)

[92rm125]

Yeah ill try some different fuel ratio's.

If you've got the step by step it would be much appreciated! haha

Well, i haven't managed to get the bike out and give a good run around yet, but i did take the plug out and it was very dark and oily. not sure if this any help... Also the engine runs fine up to about 1/4-1/2 throttle and then starts to choke and blow white smoke. Sorry if im asking a lot of your services for free! haha but like i sed im a complete newbie needing help! lol

[Florida 393]

Try this thread from the 2T KB back in 2003. It has a lot of good information in its text.

Jetting!

Best of luck with the jetting.

Bill

[92rm125]

Thnx, that was very very helpful.