Maintenance & Technical > KX250 / KX125
Getting the jet needle out of the throttle valve?
mustangfury:
I'll definitely mess with it a bit before i get any new jets or needles. I still have a lot of options to work with.
One other thing i just thought of. If i tip my bike to one side, i can't remember which - i believe the left, by about 30 degrees or more from vertical, fuel will begin streaming out the overflow valve on the side of the carb. It will run as fast as if you had the fuel line disconnected from the carb and opened up the valve. Do you know what could be causing that? I was thinking maybe the float height? It might just be a little high but not high enough for fuel to flood into the engine unless at a slight tilt. Let me know what you think.
Hillclimb#42:
That is normal. Fuel does come out when you tip it.
mustangfury:
So, if you lean your bike against a tree while you take a break your fuel tank may empty?
Do you just shut off the fuel to prevent that?
mustangfury:
ok tuck,
I did some more tests today. I put in a 50 pilot jet and ran it at all kinds of different clip positions, starting rich of course. The bike ran the best in the mid range when the clip was as rich as possible. Off the start was still bogging and mushy sounding. Off the start the bike ran the best when the clip was in the middle position. It had great acceleration then as soon as it hit mid range it nose dived forward and bogged real bad. It needed more fuel. I put the choke on then it did the opposite. Started a little slow then took off when it hit the mid range.
The plug looks a lot different. I attached pictures. The electrode is white on the intake side and black on the exhaust port. I never went WOT with it. I rode around at 1/4 to 1/2 throttle and got her nice and hot. Also, i got her warmed up to operating temp with the old plug, then switched to the new one after she was hot. The pics are of the new plug.
I disregarded the oil spitting because i know there is a lot that needs to be cleaned out that is left over from the last run. It was a lot less though. I think it may have been running a little too lean.
The bike overall performed better with the way it was before with the 52 main. the only thing that was better with the 50 was oil spitting and maybe the plug color, depending on what you think.
The weather today has been about 80 degrees and the humidity 60%. The other days tests were in 70-75 degree weather with 30% humidity.
mustangfury:
here are more spark plug pictures. i tried to get some to show the one side being black and the other white.
I was thinking maybe try to put the 52 pilot jet back in and then lean out the clip position. The other thing i was thinking about trying was maybe to go back to the 158 main jet and see what it does. I am going to wait till i hear what you think about everything though. If you think it is ok, i was thinking getting it up a little further in the throttle might tell us something too?
they all look lean to me but i don't know if that has to do with the fact i didn't go WOT at all. I didn't want to run it too hard since it might be lean.
thanks
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