Maintenance & Technical > KX250 / KX125
My bike is a pig. It eats gas and spark plugs.
mikesmith:
--- Quote from: mxrider503 ---also what is the typical gas mileage of a kx250? i have one of those larger img gas tanks and it goes through half a tank about 1.5 gallons in about an hour of not even consistent riding.
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Your right,your bike sucks gas!Now depends on riding style and terrain (like snow,deep sand,deep mud) but if your leaking fuel out the overflow as Hughes said you should get a needle and seat, check that the floats do float and are not sinking from a leak in them,adjust your float parallel to the carb body as you hold it upside down with the float causing the needle to just touch the seat (not sure for a 250,but try 17-19mm) If you adjust it to little you will have fuel leakig out the overflow and bike loading up,to much will starve the bike for fuel.You still may have jetting issues but one thing at a time,sometimes you bang your head against the wall over a simple little problem.
mxrider503:
yeah if the bike is running its either on or off in my opinion so that could be the issue but it does still drip gas. I did adjust the tang before but the needle that gets pushed by the float did look just a little worn. It is very frustrating to always be tweaking. Could this float problem contribute to the spark plug fouling? Also I have a mud fetish so u'll usually find me in the mud pits at the trails. I would expect more gas to burn under these conditions but a tank should last at least 2 days of riding or close right? Ill take the carb apart and see what I can fiddle with :) thanks and anymore advice is appreciated. By the way im looking to get a few other kawi guys out here riding with my buds and I. So if your somewhere close to CT and you want some problem free riding I'd luv to stick it to a few cr punks out here. :evil: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup:
JDRooster:
Brian,
You can use the air screw (the brass one at the bottom of the air intake) to tell if you pilot is off. Start with it one to 1.5 turns out. If throttle response is better when you turn it in, you need to a bigger pilot. If it runs better as you turn it out, you need a smaller pilot. If you're within the range of 1 to 2 turns out, and achieve the best throttle response, your pilot is spot on. Pilot jetting is most often the cause of fouled plugs, if the top end is good. Worn top ends can cause fouled plugs as well. As stated before, the clip position affects around 1/8 to 1/2 throttle, and the main jet affects 1/2 to wfo. If the bike isn't gurgling or bogging up top, then the main is probably okay. throttle chop testing is a way to verify main jets, but I've never done it myself. If you have fuel running from your overflows, you either have a piece of dirt in one of the orfices, or the float height is set too high. try using comp[ressed air or running a small piece of solder up through the orfices. As mentioned before as well, if the needle and seat are worn, you could get excess gas in the bowl as well, and would create a rich, plugfouling, overflow dripping situation. Hope this helps.
kshackle:
--- Quote from: mxrider503 on May 05, 2005, 02:35:58 AM ---yeah if the bike is running its either on or off in my opinion so that could be the issue but it does still drip gas. I did adjust the tang before but the needle that gets pushed by the float did look just a little worn.
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If the bike is leaking gas and the float needle looked a little worn.....your problem is staring you in the face. Change the float needle, and reset the float level. This problem alone can be the root cause of all your woes.....do not look to jetting until the float is set properly.
--- Quote from: mxrider503 on May 05, 2005, 02:35:58 AM ---It is very frustrating to always be tweaking. Could this float problem contribute to the spark plug fouling? Also I have a mud fetish so u'll usually find me in the mud pits at the trails. I would expect more gas to burn under these conditions but a tank should last at least 2 days of riding or close right? Ill take the carb apart and see what I can fiddle with :) thanks and anymore advice is appreciated. By the way im looking to get a few other kawi guys out here riding with my buds and I. So if your somewhere close to CT and you want some problem free riding I'd luv to stick it to a few cr punks out here. :evil: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup: :blowup:
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eprovenzano:
Just a thought... I have a 99 KX250, the specs call for a BR8ES plug, you are running a 9. The plug may not be hot enough. Depending on the riding I'm planning, I will run either an eight or a seven. If I'm heading to the track, I run an eight. If I'm out with a bunch of guys on their 4 wheelers, and will be slow wood/trails, I'll run a seven. I've had the bike to almost 2 years now, and only fouled 2 plugs. (both times I forgot to switch to a seven before hitting the trails.)
My bike is still running a little rich, I need to drop one notch on the clip, but I've been lazy and haven't gotten to it yet. After I change the jetting, I'll probably stay with the BR8ES plug.
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