Jonsy 670 running like crap

[HUSKYMAN]

My 670 is irritating me. It cuts fine when bucking logs, but when I try to cut at an angle it does not cut well at all. The thing I can't figure out is when I try to cut a log from underneath (with the top of the bar) it has no power whatsoever, and the engine cuts in and out. How it knows I am cutting with the top of the bar is beyond me.

I have a carb kit for it but I dont think the carb is the problem. Any ideas?

 

[stihl 440]

fuel?

It sounds like it's not getting fuel. Maybe cracked fuel line, fuel filter plugged etc...:hmm3grin2orange: :biggrinbounce2:

 

[mountainlake]

The way your descibing it sounds like the top of the boot between the carb and cylinder is cracked or loose clamps, crack opens when you push up on the bar. Steve

 

[Mr.]

I'll take crank seals for an air leak, Alex.

Fred

 

[ericjeeper]

I am putting my money on the carb boot

for 100 Alex..
Why can't we do a game show with a hot babe? Vanna can I have a B? Vanna can I have a J
Figured I had better ask for those two letter seperate. LOL

 

[bama]

I'll take crank seals for an air leak, Alex.

Fred

:hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange:

 

[HUSKYMAN]

Crank seals on the clutch side? Should I try the old WD-40 on the seal trick? Thanks

 

[SawTroll]

Bump - this one came to a premature end........

 

[PES+]

Take off the recoil and air shroud and remove the kill switch wire from the coil. I'll bet the cutting out is a pinched kill switch wire that only grounds out when you pull against the buffers.

The most common reason is misrouted wire in the air shroud that gets chafed and pinched in the upper right recoil screw.

I have also seen bad kill switches act this way.

Try this and see if it solves the up cut issue and then see if you also have other issues.