Carb/ fuel questions

[Johnmn]

On my jonsered 670 when I run it with clutch side down it gets pig rich I can't seem to get it to stop any thoughts? It has a tilly recirculating carb

 

[tickbitintn]

Wow six hours with out any response! is that a new record???
I'm not familiar with the 670 or recirculating carb....
Did it just start doing this all of a sudden?
Been in the carb or done any work on the saw?

 

[MustangMike]

Would like to help, but I have no knowledge on this one. Best of Luck.

 

[a. palmer jr.]

I'd advise a pressure/vac test but normally when they have worn seals they run leaner when you turn them over..

 

[tickbitintn]

Perhaps a post in the j-red specific thread might get a better response.

 

[Chainsaw Jim]

It's likely a crank seal.

 

[drf256]

It's likely a crank seal.

Yuppers

And probably the clutch side that gets wet and seals better, or the fly side that gets drier.

The diaphragm carbs on a saw don't really get affected by position. There's no float.

 

[paragonbuilder]

Yuppers

And probably the clutch side that gets wet and seals better, or the fly side that gets drier.

The diaphragm carbs on a saw don't really get affected by position. There's no float.

Yup.
Sounds like it's tuned for the air leak. You're essentially plugging the air leak when you turn it on that side. So It gets rich.

 

[Johnmn]

Yea it has new bearins, seals, piston, I did a base delete could that be leaking and causing this? Im not saying it's not the seals I don't know

 

[Crzybowhntr]

Yea it has new bearins, seals, piston, I did a base delete could that be leaking and causing this? Im not saying it's not the seals I don't know

Could be but I don`t think you`ll know until you press/vac test it.

 

[Johnmn]

I'll have to see if any of the nearby dealers have one but I doubt it. Grr

 

[Mastermind]

If the metering lever is too high it could cause it to run fat in certain positions. Get it idling, then tilt it bar down.....does it stumble?

 

[Johnmn]

I'll check

 

[Johnmn]

If the metering lever is too high it could cause it to run fat in certain positions. Get it idling, then tilt it bar down.....does it stumble?

Had the saw out it runs good everywhere until it's on its clutch side then it gets rich it seems like I can smell gas too then if you tip it straight once it clears up it runs good again

 

[Mastermind]

That's an odd one for sure.

 

[smokey7]

Tank vent is venting liquid fuel into the crab area? I've never had that happen and I've built several of these saws. If bet that the oring on the oil pump didnt get replaced or is tore. Its easy to forget that oring but a vac test will tell all.

 

[Chainsaw Jim]

The tank vent may be creating a problem when submerged or the fuel line is cracked and closes every time you tilt the saw.

 

[Pincher]

Sounds alot like my Jonsered 525 when the tank vent tube failed inside the airfilter cover. My 670 saw does not have the recirculating carb. Have the fuel lines been replaced? If vent failed, it looks like fuel would run onto ground and not saturate the filter as my 525 did.

 

[Johnmn]

Well I may have found the problem. Was checking out the fuel line and it broke off right at the tank. My question is do I need one of the spiral fuel lines or can I just get some 3/16 from my local stihl dealer? At least I believe that's the size.

 

[Johnmn]

Tank vent is venting liquid fuel into the crab area? I've never had that happen and I've built several of these saws. If bet that the oring on the oil pump didnt get replaced or is tore. Its easy to forget that oring but a vac test will tell all.

No I never did replace the oring but I'm gonna see what new fuel line does first do you know for sure on the size? 3/16?