125sx running lean

sledneck43
Edited Date/Time 1/27/2020 6:22pm
Hey I just rebuilt my 2003 sx125 and put a lectron carb on it, I started it the other day for the first time and it ran perfect. I started it again a couple days later to drain the float bowl and as it ran out of fuel it started to rev up and died, I went to start it today to finish the heat cycle (-2c outside) and it wouldn’t run without the choke on and was screaming, do you think this was only due to the cold weather why it was running so lean? I have The oil mixed at 32:1 with klotz r50

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sledneck43 1/13/2020 2:41pm
1/13/2020 2:41pm
Also I want to know if I should be concerned about the piston being scored
Paw Paw 271
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Paw Paw 271 1/13/2020 6:01pm
1/13/2020 6:01pm
Running a 2 stroke out of fuel is a very good way to eat a piston as it over heats and has no lubrication from the fuel.
Remove the exhaust pipe and look into the exhaust port at the piston to see if it is ok. Also your pilot jet may be plugged.

Paw PAw
sledneck43 1/13/2020 7:59pm
1/13/2020 7:59pm
Paw Paw 271 wrote:
Running a 2 stroke out of fuel is a very good way to eat a piston as it over heats and has no lubrication from the...
Running a 2 stroke out of fuel is a very good way to eat a piston as it over heats and has no lubrication from the fuel.
Remove the exhaust pipe and look into the exhaust port at the piston to see if it is ok. Also your pilot jet may be plugged.

Paw PAw
It has a lectron carb, the only jet it has is the power jet, and the carb is clean and new and yeah I know, was a bad idea I knew it too
jlv148
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jlv148 1/13/2020 8:19pm
1/13/2020 8:19pm
Sounds like an air leak. The carb is probably not in the intake manifold completely.

The Shop

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Blackjack31
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Blackjack31 1/13/2020 8:26pm
1/13/2020 8:26pm
Doing that one time I don’t think would do any harm. It’s always best to check. I have ran bikes out of gas, on purpose and not, and have never had any issues. I would be more worried about screaming a motor that isn’t properly warmed up. But the answer to your question, just richen and see what happens. I have never ran an electron but on there website they give details on how to adjust the “metering rod”, which from what I understand, should be what fixes you lean issue. Also, premix ratio will not determine whether your bike idles high or low or whatever. 32:1 is fine though. I have ran 32:1, 40:1, 44:1 and no difference in how it runs. It looks mighty cold where you are as well, that will cause your bike to run more lean. Also, if I run a bike out of gas I will always turn my gas on and turn the throttle over a few turns, give time for gas to get back to where it’s supposed to be.
15tc150
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15tc150 1/26/2020 11:02am
1/26/2020 11:02am
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
Bruce372
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Bruce372 1/26/2020 2:58pm
1/26/2020 2:58pm
Although a good replacement for older carbs and on 250s 300s, I am yet to be convinced its superior to a pwk on a 125 where they need a good shot of fuel.

Just a personal opinion, ktm125s have always run pwk until 2017 and have always been strong engines. I could see the lectron being mega on the 250s
JessieDF
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JessieDF 1/27/2020 10:55am
1/27/2020 10:55am
15tc150 wrote:
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to...
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
Tracktor
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Tracktor 1/27/2020 1:32pm
1/27/2020 1:32pm
15tc150 wrote:
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to...
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
Wut? Are you really saying air temp has no relation to jetting once and engine is warmed up?? Not quite how it works in reality...............
15tc150
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15tc150 1/27/2020 5:00pm
1/27/2020 5:00pm
15tc150 wrote:
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to...
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
Tracktor wrote:
Wut? Are you really saying air temp has no relation to jetting once and engine is warmed up?? Not quite how it works in reality...............
You must have never ridden a 2 stroke in negative temps
15tc150
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15tc150 1/27/2020 5:01pm
1/27/2020 5:01pm
15tc150 wrote:
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to...
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
And you must also not know about LEL's either
JessieDF
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JessieDF 1/27/2020 5:07pm
1/27/2020 5:07pm
15tc150 wrote:
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to...
Well, with the cold temps, you may have just ran the carb out of spec, due to the colder denser air charge needing more fuel to run proper, this does happen on cold days with 2 strokes, it can bring the fuel/air ratio to a point when there is enough air to fuel entering that it's reaching a point at which it will be able to raise the rpm with zero input
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
15tc150 wrote:
And you must also not know about LEL's either
LEL's don't come into play here he needs to go back to stock tuning and ride it hard and fast clean the cob webs out of the carb, pull the plug and sniff it to see if it smells rich or lean... we used to do this when we raced in Alaska.

JessieDF
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JessieDF 1/27/2020 5:15pm
1/27/2020 5:15pm
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
Tracktor wrote:
Wut? Are you really saying air temp has no relation to jetting once and engine is warmed up?? Not quite how it works in reality...............
15tc150 wrote:
You must have never ridden a 2 stroke in negative temps
Hey I used to race in Alaska for 5 years never had any issues once warmed up and ride the bike hard
15tc150
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15tc150 1/27/2020 5:31pm
1/27/2020 5:31pm
Tracktor wrote:
Wut? Are you really saying air temp has no relation to jetting once and engine is warmed up?? Not quite how it works in reality...............
15tc150 wrote:
You must have never ridden a 2 stroke in negative temps
JessieDF wrote:
Hey I used to race in Alaska for 5 years never had any issues once warmed up and ride the bike hard
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my experience with it has been that negative temps; mess with jetting, and even when jetting for it, still having issues with it, multiple times, strange, difference in region? Both west coast; but I'm down in the bc coast
JessieDF
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JessieDF 1/27/2020 5:35pm
1/27/2020 5:35pm
15tc150 wrote:
You must have never ridden a 2 stroke in negative temps
JessieDF wrote:
Hey I used to race in Alaska for 5 years never had any issues once warmed up and ride the bike hard
15tc150 wrote:
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my...
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my experience with it has been that negative temps; mess with jetting, and even when jetting for it, still having issues with it, multiple times, strange, difference in region? Both west coast; but I'm down in the bc coast
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well thats another story maybe your fuel is watered down causing tuning issues??
15tc150
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15tc150 1/27/2020 5:40pm
1/27/2020 5:40pm
JessieDF wrote:
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the...
HUH? 15tc 150 I find you comment not very on point here as cold air has nothing to do with this matter as only when the motor is cold....but as soon as it warms up it will run in spec.
15tc150 wrote:
And you must also not know about LEL's either
JessieDF wrote:
LEL's don't come into play here he needs to go back to stock tuning and ride it hard and fast clean the cob webs out of...
LEL's don't come into play here he needs to go back to stock tuning and ride it hard and fast clean the cob webs out of the carb, pull the plug and sniff it to see if it smells rich or lean... we used to do this when we raced in Alaska.

Uhhhhh, lel's don't come into play? Alrighty then
15tc150
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15tc150 1/27/2020 5:40pm
1/27/2020 5:40pm
JessieDF wrote:
Hey I used to race in Alaska for 5 years never had any issues once warmed up and ride the bike hard
15tc150 wrote:
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my...
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my experience with it has been that negative temps; mess with jetting, and even when jetting for it, still having issues with it, multiple times, strange, difference in region? Both west coast; but I'm down in the bc coast
JessieDF wrote:
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well...
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well thats another story maybe your fuel is watered down causing tuning issues??
In minus ten c? Sure
JessieDF
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JessieDF 1/27/2020 5:43pm
1/27/2020 5:43pm
15tc150 wrote:
And you must also not know about LEL's either
JessieDF wrote:
LEL's don't come into play here he needs to go back to stock tuning and ride it hard and fast clean the cob webs out of...
LEL's don't come into play here he needs to go back to stock tuning and ride it hard and fast clean the cob webs out of the carb, pull the plug and sniff it to see if it smells rich or lean... we used to do this when we raced in Alaska.

15tc150 wrote:
Uhhhhh, lel's don't come into play? Alrighty then
I am happy you agree it seems that you have not the experienced too many tunning issues and are learning and that is very nice

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JessieDF
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JessieDF 1/27/2020 5:48pm
1/27/2020 5:48pm
15tc150 wrote:
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my...
Iv heard of lots of people having issues with it, snow bike 2 strokes, Iv heard lots of people having issues with jetting, and even my experience with it has been that negative temps; mess with jetting, and even when jetting for it, still having issues with it, multiple times, strange, difference in region? Both west coast; but I'm down in the bc coast
JessieDF wrote:
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well...
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well thats another story maybe your fuel is watered down causing tuning issues??
15tc150 wrote:
In minus ten c? Sure
well I will let you in on a little secret that really helps...you need to find some resign from a pine tree and soak your needle in it for 24 hours this gives the needle an edge and really helps with running to lean
15tc150
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15tc150 1/27/2020 5:57pm
1/27/2020 5:57pm
JessieDF wrote:
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well...
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well thats another story maybe your fuel is watered down causing tuning issues??
15tc150 wrote:
In minus ten c? Sure
JessieDF wrote:
well I will let you in on a little secret that really helps...you need to find some resign from a pine tree and soak your needle...
well I will let you in on a little secret that really helps...you need to find some resign from a pine tree and soak your needle in it for 24 hours this gives the needle an edge and really helps with running to lean
You are wise beyond your years Smile
15tc150
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15tc150 1/27/2020 6:22pm
1/27/2020 6:22pm
JessieDF wrote:
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well...
Nah its people who fiddle too much with tuning and spinning there wheels in the wrong direction gets everyone confused as for been in BC well thats another story maybe your fuel is watered down causing tuning issues??
15tc150 wrote:
In minus ten c? Sure
JessieDF wrote:
well I will let you in on a little secret that really helps...you need to find some resign from a pine tree and soak your needle...
well I will let you in on a little secret that really helps...you need to find some resign from a pine tree and soak your needle in it for 24 hours this gives the needle an edge and really helps with running to lean
I love you

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