Troubleshooting blue clone 6.5

[Voodoo Rufus]

I have this random blue colored clone engine with near zero hours on it. It sat outside and got all gummed up from gas. After giving the carb a thorough cleaning I got it to fire a couple months ago. It would sort of idle on choke but not off of it, nor would it rev very well. Assuming the jets were plugged I decided to replace them. I then changed out the stock jet to a #80 and a GX140 emulsion tube. Now it will run off of choke fine and rev to mid and high RPM, but not idle. It likes to hunt between mid and high rpm, never smoothing out. The governor arm swings with it adjusting the RPM. Even with the idle speed screw backed all the way out the throttle will not touch it when running. I'm thinking that I need to verify that the governor arm is actually adjusted where it should be for starters. Should I swap out the emulsion tube, also?

 

[itsid]

I'd revert to the original setup to get it running properly first tbh,
since air and jetting is crucial and as long as you are unaware of some root cause for it not running as it should,
you might not want to hide said cause with improved parts.

jet and emulsion tube are easy to clean properly by hand ( a short length of monofilament fishing line is all you'll need)
and cannot be the cause for this issue once clean

governor setting is straight forward actually, but it requires the carb to be running well.
So another carb clean is likely due.
(yes.. people cleaned their carbs three and four times in a row until they finally succeeded removing all gunk from all passageways)
there are tiny air passages that are a PITA to get clean (again mono filament fishing line serves you well for most of these!)

Anywhoo.. once the carb is actually clean and the engine runs well.

remove the tank, and loosen the nut on the governor arm,
move the governor arm to fully open the throttle (throttle limiting screw on the carb all the way out).. observe the butterfly to be at 90°.
Now hold the arm in place and move the governor shaft in the same direction as far as it will go.
then tighten the nut again.
Once that's done, remount gas tank and air filter (in case you removed it)
start the engine and rev it up...
dial in the throttle limiting screw to as close to 3600 rpms as possible.

You can adjust to a bit higher or a bit lower as you like, but I don't have any noted values for blue clones.
Lifans allow 3600 +/- 300 [ so 3300-3900]
Hondas allow 3700 +/- 400 [ so 3300-4100] depending on model

but with 3600 you're on the safe side for any engine

'sid

 

[Voodoo Rufus]

Thanks. I'll try to clean the old jet and tube first, and report back next time I work on it.