IndyMX said:You can adjust the idle screw until it idles a little bit.. But more than a few seconds isn't good.
I never do understand why people want their two stroke to idle, it's serves no purpose at all.
Four strokes I get, they're a bit harder to start. But a properly maintained two stroke should start on the first or second kick, every time. If it's not, there's something wrong with it that needs to be fixed.
If it's not idling, but running fine otherwise, it's how it should be. It doesn't need to be fixed.
slodad said:I beg to differ on the benefits of a two stroke that idles. It's often more convenient if it will keep running when you have to make a quick stop to clear a trail, help a downed rider or defog your goggles. The four two strokes that our family has owned, YZ125 & 250, KTM 125 and CR250 have all idled well. At the end of a day of riding, we'll turn off the petcock and just let them idle until the floatbowl is dry while we take off gear and load other stuff. All it takes is proper jetting and correct float height. We've never had issues with plug fouling from extended idling.
I know that lots of racers like their two strokes to die when they're not moving, but I've not heard an explanation for it, other than "just because." Not being a racer, I can't offer a rebuttal to that. Anyway, I believe that time spent jetting is not wasted and it brings the satisfaction that the bike is performing to its potential.
rmc_olderthandirt said:It is certainly possible for a two stroke to idle and not foul plugs. I have a two stroke outboard and a pair of two stroke PWC and they will idle all day long.
After a lot of fiddling I finally managed to get my YZ-125 to idle, most of the time...
I am still working on the WR-250.
To me, it is really important that the bike idle, at least for a minute, and especially when it is hot. When I am riding really difficult terrain and need to creep over some obstacle, especially down hill, it is a real pain to have the engine die. After you have been riding 60 miles of difficult goat trails the extra effort to start the bike becomes an issue.
If you just ride at the MX track I suppose it wouldn't matter too much, as long as the engine doesn't die mid jump.
To get the engine to idle the first thing you want to do is make sure you don't have any air leaks. This would include crank seals. While you are at it check the reeds and make sure they are in good shape. Minor leaks or minor reed warpage won't bother top end much but it will be hell on the idle.
Next step would be to clean the carburetor and make sure the float level is correct. If the float level is off you may never get a good idle and changing the float level may change the idle characteristics.
Once everything else is proper then it is time to make adjustments on the carburetor. There will be two screws that you are dealing with. One adjusts the idle speed and the other adjusts the mixture.
Start with the bike warmed up to normal operating temperature.
Set the idle speed to whatever it takes to get it to idle. Now adjust the mixture screw to get the fastest idle.
Now adjust the idle speed a bit slower. If the process is working you should be able to slow the idle down a bit and have it continue to idle. Again, as slow as you can and have it keep idling. Now adjust the mixture for fastest idle.
Repeat this process until you can't get it to idle any slower or you achieve a suitable idle speed.
Rod
96CRkid said:So any ways...the bike runs great, couldn't wish for more...but it does not idle at all!
btm1948 said:its not that they are not meant to idle its that at most times there is no point to having it idle. the bike [if tuned properly] should start first or second kick if it dies.
Tomsti said:My 97 CR250 idles all day with no issues with plugs and I also ride the goat trails. :)
whenfoxforks-ruled said:Track law clearly stated that a 2 stroke comes off bottom with near to no idle stronger, purely rumor mind you! I have asked before if a dyno will show the engine coming off bottom, as it does in the dirt? I have felt it, others have also. A simple test you can perform yourself. It is a mystery why a 4 stroke is easier to kill in a corner. Here we go again, myself and others have found it better to have the idle cranked up as high as you can ride it on a 4 stroke. Carb design or the torque thing? The bigger the 2 stroke, the harder to get to idle. Bottom line is if you can't get it to idle, you have mechanical issues somewhere. As easy as an airfilter, to an engine overhaul. You need some tools and a manual, and get used to looking at your plug, alot!
Floridadtz said:Hi guys. I need my DT175 to idle, because I ride it on the road....
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