by "Twingo Tamer - About to descend into project car hell." (oppisitelock)
Published 06/14/2017 at 14:27
by "Twingo Tamer - About to descend into project car hell." (oppisitelock)
Published 06/14/2017 at 14:27
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Rebuilt my bike’s carb and had to remove the fuel screw to do so since every passage was gummed up with bad fuel. Now I’ve got it to idle and it’ll rev up fine, but it dies when it drops to idle after being at rpm. What could potentially cause this?
The carb is for a 125cc and just a cheap chinese thing. Has idle air screw on the side and what I believe to be a fuel adjustment screw on the bottom. It’s a stepped screw that sits on a spring and washer.
"Die-Trying" (die-trying)
06/14/2017 at 14:34, STARS: 0
what does the spark plug look like after it dies?......
"crowmolly" (crowmolly)
06/14/2017 at 14:39, STARS: 3
Try turning the screw in 1/4 turn at a time. That should fatten up the idle mixture.
Edit: Try this. Yours is not a Walbro but it looks like a Chinese copy.
http://www.ccwthariders.com/uploads/9/7/7/9/9779070/pz_carb_tuning_manual.pdf
"Twingo Tamer - About to descend into project car hell." (oppisitelock)
06/14/2017 at 14:48, STARS: 1
Not too bad, doesnt seem to be mega rich.
"Die-Trying" (die-trying)
06/14/2017 at 14:50, STARS: 0
does it have a filter ahead of the carb that might of gotten gummed up when the carb did?.......
"Twingo Tamer - About to descend into project car hell." (oppisitelock)
06/14/2017 at 14:52, STARS: 0
Oh wow thanks for that, one of the carbs in the guide is super similar to mine, even has the same model name haha. The Chinese get away with some pretty blatant stuff...
"Twingo Tamer - About to descend into project car hell." (oppisitelock)
06/14/2017 at 14:54, STARS: 1
Na no filter, thinking of adding one though.
"crowmolly" (crowmolly)
06/14/2017 at 14:56, STARS: 0
Yeah, that’s what I figured was up. Unreal. Hope you get it sorted out!
"Twingo Tamer - About to descend into project car hell." (oppisitelock)
06/14/2017 at 14:56, STARS: 0
Thanks man, I’m looking through this and literally the only difference is the pilot jet location. Perfect copy almost otherwise haha.
"Die-Trying" (die-trying)
06/14/2017 at 15:02, STARS: 1
but that kills the 20 questions game..........
"DipodomysDeserti" (dipodomysdeserti)
06/14/2017 at 16:59, STARS: 0
That usually indicates you’re running too lean. Could be the mixture is off, gunk is still stuck in the jets/needles, float is set too low, or even a torn intake boot. If you made any exhaust or intake mods you might need a larger jet.
"DipodomysDeserti" (dipodomysdeserti)
06/14/2017 at 17:02, STARS: 1
Turning a mixture screw in (clockwise) will generally lean out the mixture.
"crowmolly" (crowmolly)
06/14/2017 at 17:24, STARS: 0
You’re right, I botched it. Turn the screw out.
"MM54" (mm54mk2)
06/14/2017 at 18:54, STARS: 0
I’m pretty sure I’ve worked on mikunis that clockwise (as in turning it in) richened the mix, so you’re not totally out there with that.
"gmporschenut also a fan of hondas" (gmporschenut)
06/14/2017 at 23:06, STARS: 0
My only experience is with snowblower/mower carbs.
When you rebuilt it did you clean the needle with venturi tubes, to make sure all the gunk is out? Also did you replace the needle valve?