Stihl 046 won't run after rebuild.....please help?

[a. palmer jr.]

125 is still a little low, maybe after break in it will be more.

 

[a. palmer jr.]

I rebuilt an 024 recently and that's all the compression I got out of it but haven't run it much.

 

[Mitch Hall]

Success!! She cranked on the first pull but now she's idling up and down not steady.

 

[Mitch Hall]

Got it all back together and we're back to square one. Will not crank over at all.

 

[a. palmer jr.]

Might try about 1/2 teaspoon of fuel mix down the spark plug hole and see if it will fire then.

 

[Mitch Hall]

Might try about 1/2 teaspoon of fuel mix down the spark plug hole and see if it will fire then.

I let it cool off completely and it fired up again. I did some light cutting and it needed some coaxing to keep idling. She floods real easy once warmed up.

 

[blsnelling]

Do not try to use it with it not running right. You'll be replacing the topend again.

Other than the decomp, air leaks will not affect compression, although they will affect the way it tunes and runs.

125 PSI is VERY low on a 046. A health 046 will make closer to 170 PSI.

Check your gauge on another known good saw. Does it have a Schrader valve at the very tip of the hose where it screws into the cylinder?

 

[HarleyT]

Sounds like you need to rebuild the carb correctly, and install a new kit with needle.....

 

[a. palmer jr.]

You might also check the H and L screws on the carburetor and see if they're around 1 turn out from lightly seated. If they're too many turns out it might cause the flooding you're describing..

 

[LoveStihlQuality]

I had some problems 046 that I didn't get flywheel torqued down and had key got out of place. Now I'm fighting getting new fuel line to seat in.

Sent from my SM-N900P using Tapatalk

 

[Boleclimber]

I've yet to see a stuck upper ring with no aluminum transfer to the cylinder wall. I'd look very closely for imperfections that may come back to rear their ugly head. You have a significant decrease in compression that can be accounted for somewhere.

 

[Mitch Hall]

Do not try to use it with it not running right. You'll be replacing the topend again.

Other than the decomp, air leaks will not affect compression, although they will affect the way it tunes and runs.

125 PSI is VERY low on a 046. A health 046 will make closer to 170 PSI.

Check your gauge on another known good saw. Does it have a Schrader valve at the very tip of the hose where it screws into the cylinder?

It does have a schrader valve.

 

[Mitch Hall]

Sounds like you need to rebuild the carb correctly, and install a new kit with needle.....

I have a new carb too. I might try that.

 

[Mitch Hall]

Sounds like you need to rebuild the carb correctly, and install a new kit with needle.....

I don't see how you could screw up a carb rebuild due to the simplicity.

 

[a. palmer jr.]

I don't see how you could screw up a carb rebuild due to the simplicity.

Believe me, it's been done..

 

[SEAM]

...if the carb is leaking internally (inlet needle below the metering diaphragm) it will flood the engine at idle but not at higher engine speeds.
Things that can go wrong when rebuilding a carb:
- metering lever height (new levers usually need to be adjusted), angle of lever ends
- wrong order gasket - diaphragm
- poorly seated spring
- leaking gaskets
- blockages within the carburetor
- leaking welch plugs

A lot of things can go wrong with carb repair

 

[Mitch Hall]

...if the carb is leaking internally (inlet needle below the metering diaphragm) it will flood the engine at idle but not at higher engine speeds.
Things that can go wrong when rebuilding a carb:
- metering lever height (new levers usually need to be adjusted), angle of lever ends
- wrong order gasket - diaphragm
- poorly seated spring
- leaking gaskets
- blockages within the carburetor
- leaking welch plugs

A lot of things can go wrong with carb repair

I put a new carb on and it immediately flooded out really bad. I'm stumped.

 

[HarleyT]

Describe this "new carb".
New? OEM? Chinese?

 

[Mitch Hall]

Describe this "new carb".
New? OEM? Chinese?

Brand new Chinese straight from the package. I keep seeing a little fuel from under the carb area and fuel coming out of the muffler like crazy even after just few pulls. I've used a few others with no issues. So far I've tried four different carbs on this thing and it keeps flooding out. When it did run it was idling erratically.

 

[HarleyT]

Try a good carb.