2003 RM125 Starting Problems

Wobbins
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Wobbins
Edited Date/Time 12/30/2020 8:04pm
Hello everybody I have been working on a 03 rm125 and I recently rebuilt the whole motor (top and bottom end) when I went to go start it up for the first time after the rebuild it would not crank up. I checked the usual culprits (tried to bump start, have good blue spark, swapped plugs, timing marks line up on stator, did a compression test which tested at around 190 psi, clean the carb and all the jets) and still no luck. I noticed after I pulled the plug after attempting to start it that the plug still looked dry so I cleaned the carb again, but fuel still does not seem to be making it in the case or even in the reeds. I tried to just pour a tiny bit of gas straight in the cylinder through the spark plug hole to see if it would even fire, but still nothing... Any suggestions or tips would be greatly appreciated because I cannot figure it out. Thanks.
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jamiechapman418 12/28/2020 8:47am
12/28/2020 8:47am
When you drain the bowl on the carb is there fuel there?
Wobbins
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Wobbins 12/28/2020 12:10pm
12/28/2020 12:10pm Edited Date/Time 12/28/2020 12:15pm
jamiechapman418 wrote:
When you drain the bowl on the carb is there fuel there?
Yes the fuel is making it into the float bowl it just doesn't make it into the engine it starts coming out the overflow tubes
jamiechapman418 12/28/2020 1:04pm
12/28/2020 1:04pm
Something is the problem there then. Float isn't closing the needle seat. Have you tried starting it holding the throttle wide open?
Wobbins
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Wobbins 12/28/2020 3:27pm
12/28/2020 3:27pm
jamiechapman418 wrote:
Something is the problem there then. Float isn't closing the needle seat. Have you tried starting it holding the throttle wide open?
Yessir I have tried starting it with the throttle in like every position possible lol. The part that confuses me though is that I checked the needle and floats while I had it apart and it seemed to be seating fine and the floats moved freely.

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Factor E
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Factor E 12/28/2020 3:28pm
12/28/2020 3:28pm
Pilot circuit still not clean
How did you clean carb?
Wobbins
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Wobbins 12/28/2020 4:57pm
12/28/2020 4:57pm Edited Date/Time 12/28/2020 4:58pm
Factor E wrote:
Pilot circuit still not clean
How did you clean carb?
Hit all the jets with carb cleaner and air and made sure that I could see through them and put a wire through them to make sure they are completely clear and then made sure there was no dirt or anything in the float bowl that would possibly cause the floats to stick
Factor E
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Factor E 12/30/2020 7:20am
12/30/2020 7:20am
If fuel is running out
Does needle have a ring on rubber point and not sealing?
O ring on needle seat is bad and allowing the leak, need to replace
Oem has kit with both parts
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Paw Paw 271
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Paw Paw 271 12/30/2020 1:37pm
12/30/2020 1:37pm
I will give this one last try...
Your float needle is either not sealing or the float level is set too high.
I still don't understand the "dry plug & flooding" you posted earlier.
I also still think you your pilot jet is plugged up or the in carb fuel passages cast into the carb are clogged from dried fuel.
Did you do a carb soak cleaning?

You have been given very good info in this post and I don't see where any of it has been addressed.

Paw Paw
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Wobbins
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Wobbins 12/30/2020 5:30pm
12/30/2020 5:30pm Edited Date/Time 12/30/2020 5:31pm
Paw Paw 271 wrote:
I will give this one last try... Your float needle is either not sealing or the float level is set too high. I still don't understand...
I will give this one last try...
Your float needle is either not sealing or the float level is set too high.
I still don't understand the "dry plug & flooding" you posted earlier.
I also still think you your pilot jet is plugged up or the in carb fuel passages cast into the carb are clogged from dried fuel.
Did you do a carb soak cleaning?

You have been given very good info in this post and I don't see where any of it has been addressed.

Paw Paw
I addressed every single post except for one??? And I found the problem anyways and I never once used the term "flooding" in this whole thread?? Idk what kinda crack ur smoking dude, but it must be some good shit.
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Wobbins
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Wobbins 12/30/2020 5:37pm
12/30/2020 5:37pm
Also for anybody wondering... I soaked the whole carb again and found out my crank was missing the keyway so I popped it out of the old crank and into the new one and she fired right up and now the plug is getting wet. Thanks to everybody that sent a response trying to help!
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Paw Paw 271
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Paw Paw 271 12/30/2020 6:25pm
12/30/2020 6:25pm
Paw Paw 271 wrote:
I will give this one last try... Your float needle is either not sealing or the float level is set too high. I still don't understand...
I will give this one last try...
Your float needle is either not sealing or the float level is set too high.
I still don't understand the "dry plug & flooding" you posted earlier.
I also still think you your pilot jet is plugged up or the in carb fuel passages cast into the carb are clogged from dried fuel.
Did you do a carb soak cleaning?

You have been given very good info in this post and I don't see where any of it has been addressed.

Paw Paw
Wobbins wrote:
I addressed every single post except for one??? And I found the problem anyways and I never once used the term "flooding" in this whole thread...
I addressed every single post except for one??? And I found the problem anyways and I never once used the term "flooding" in this whole thread?? Idk what kinda crack ur smoking dude, but it must be some good shit.
Go back and read again. "Dry spark Plug with fuel coming out the over flow..."

Your words not mine.

You ask for help and folks tried to do so, but you have not responded.

Paw PAw
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Wobbins
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Wobbins 12/30/2020 6:29pm
12/30/2020 6:29pm Edited Date/Time 12/30/2020 6:33pm
Paw Paw 271 wrote:
I will give this one last try... Your float needle is either not sealing or the float level is set too high. I still don't understand...
I will give this one last try...
Your float needle is either not sealing or the float level is set too high.
I still don't understand the "dry plug & flooding" you posted earlier.
I also still think you your pilot jet is plugged up or the in carb fuel passages cast into the carb are clogged from dried fuel.
Did you do a carb soak cleaning?

You have been given very good info in this post and I don't see where any of it has been addressed.

Paw Paw
Wobbins wrote:
I addressed every single post except for one??? And I found the problem anyways and I never once used the term "flooding" in this whole thread...
I addressed every single post except for one??? And I found the problem anyways and I never once used the term "flooding" in this whole thread?? Idk what kinda crack ur smoking dude, but it must be some good shit.
Paw Paw 271 wrote:
Go back and read again. "Dry spark Plug with fuel coming out the over flow..." Your words not mine. You ask for help and folks tried...
Go back and read again. "Dry spark Plug with fuel coming out the over flow..."

Your words not mine.

You ask for help and folks tried to do so, but you have not responded.

Paw PAw
i meant the carb overflow dude shoot me for not specifying lmao ur mad on the internet for no reason. I responded nicely to everybody who tried giving me help and you come on here like im ignoring everybody use your eyes dude. I'm not sure how I ignored anybody, but if it helps you sleep at night knowing you won a stupid internet argument, be my guest... sad
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