2013 yz125 engine problems

Didn't tell us much. Check the easy things first. New spark plug and check for a strong bright spark out of the plug when kicking it......drain float bowl and tank and get some fresh gas.

Is the idle set low? Does it have compression? Is the air filter clean? Losing water? Reeds good?

Air leak?-Erratic high idle when letting off the gas?

Does it rev once past the bog? If so, could be the power valve not opening.

If it idles fine but doesn't want to rev, could be a plugged jet (don't know how Lectrons work though) or bad crank/rod bearings.

Probably the carb thought I read that lectron carbs are not clean off the bottom good on mid n top. You have a stock carb to maybe swap it with and try see if that makes a difference.

I said PV not opening, I should have said "staying open". Try to see if it's open or closed when the engine's not running.

my ktm 150 did the same thing reeds went bad which caused no bottom end. put new reeds in and its as good as new!

Not sure if it makes a difference, but they used different pistons from 05 to 13. Ones flat and ones domed.

That's where I would go first the reeds

Is the air box wet from fuel, if so reeds are bad. Oil coming out pipe exhaust valve has problems maybe.

Go richer on metering rod on lectron possibly.

Reeds

Piston in backwards?

Take off the side power valve cover and check to see that the power valve is actuating when you rev it up.

I have a Lectron on an '05 CR125... It took much more adjusting to get it set right than I anticipated. I love it now. Smooth and predictable power throughout the RPM range.

The "Power Jet" was toughest to get right.

They come set as close as possible, but...Every bike is different.

I had to lean the metering rod 1/2 turn (Lengthen=turn left=leaner) and adjust the air/idle screw for good starting/idle. I went back and forth awhile on this.

I had to richen the "Power Jet" about an 1/8-3/16 turn (CCW=open=richen) due to a slight lean bog on top. I run 32:1 with 50/50 Avgas 100LL/87 Ethanol free, which puts it at about 96 octane R+M/2.

You do have flat side of metering rod facing engine, right?

What sort of fuel are you using? Given that you could do all the work you listed, I assume you have fresh fuel?

Did it ever run "right" with the Lectron? Do you have good "snappy" slide closure when opening and quickly releasing the throttle with the engine off? Also when you twist the throttle fully, can you feel the slide hit the top/roof of the carb? Do this with the steering full left and right stop and several points inbetween.


Anyhoo, it looks like you've run through the obvious potential issues. I would go back to the carb:

https://www.lectronfuelsystems.com/tech


EDIT: I had to laugh a bit when you said your 2-stroke "had some smoke coming out the exhaust". They do that. Not busting on ya, and good luck!

EDIT #2: If it revs after the bog, I'd say your Power Jet needs to be richened a bit. Go a bit either way because it is tough to tell a rich or lean bog. Go a small amount both ways, rich first.

OK, luis97... I apologized in the other thread you started concerning the same issue.

Lots of blokes here have given their time and opinions. MX BROS are great.

Go through the Lectron settings/cable/slide range one last time. Do you have a correct throttle cable? The one Lectron provided me sucked/DID NOT WORK. I had a few custom built by Motion Pro without the stupid "in-line adjuster" with plenty of range. Check/Double check.

If the carb is NOT the culprit, you need to perform BOTH a compression AND leak-down test on that bike. The internet is littered with "How-To's".

Good Luck.

Sounds too lean to me. If it bogs and wants to die thats lean. If its too rich it wont die out, it would get loaded up and chug smoke. Do you have the stock carb? Put that back on quick and see how it runs to eliminate an issue with the engine. Me personally id keep the stock carb on.

I don't get it. Repacking the silencer should have fixed this.

Luis,

Study the templates of successful paid forum posters and you will arrive at an answer about how to solve your issues. Also, I have put some key phrases together in my signature line on how to identify fake posters (as I see from your verbage that you are very familiar with).

But, just for a quick answer, all of your problems can be solved, like Harry said, by repacking your silencer. But the key, and this is the most important part, the packing material must be cat hair!

Hey guys, thanks in advance!

Hey kzizok...

I lit him up in the other thread he posted, then apologized. I could not fathom how stupid he could be with two other YZ125's that work fine, could do all the work he alleged to have done, and can't figure it out. I felt like I had to extract from him the obvious.

I did a bit of research on "paid forum posting". What a load of shit. I work in IT, but not the web side.

Luis, IF you are genuinely seeking help, well, OK. If not, you are a worthless person. Wasting the time of people that want to help those that share similar interests for your own gain is reprehensible.

Which is it, Luis97? If the latter...

Wow... I took the time to read the entire thread. I read OP, then cast my opinion... Amazing how predictable these maggots are. Nothing but a pattern of "Call/Input/Response/Plea".

At least my gut instincts thought he was a "MORAN" when I blasted him in his duplicate thread.

Edit: Removed salty language