what's wrong with this Stihl 070 ?

[markvanzee]

hey guys,

My 070 runs very good, but only when horizontal. as you can see in the video, it accelerates when i lower the bar. i need some help from the 070/090 expert on this one.


what's wrong with this Stihl 070 ? - YouTube

thanks in advance for your help and tips

 

[MHouse1028]

not sure but i must say that is a very nice saw!!

 

[watsonr]

It probably has an air leak. Pressure test it before it burns up the piston.

 

[Whiskers]

It probably has an air leak. Pressure test it before it burns up the piston.

What he said.

 

[blsnelling]

Does it maintain that high idle if left in the nose down attitude? I suspect your just dumping pooled fuel into the cylinder.

 

[markvanzee]

Does it maintain that high idle if left in the nose down attitude? I suspect your just dumping pooled fuel into the cylinder.

that could be possible, but it doesn't run rich at all and the high idle doesn't stop unless the saw is held horizontal

 

[JDNicol]

Is the tank full with mix? Check the fuel hose it might be split where it joins the elbow connector.

Pooled fuel being displaced would cause the saw to load up/stall.

 

[pioneerguy600]

Is the tank full with mix? Check the fuel hose it might be split where it joins the elbow connector.

Pooled fuel being displaced would cause the saw to load up/stall.

+1,..that saw is running lean when tipped forward, check out your fuel line , check to see where the end of thre fuel line and filter is positioned, it might be hung up at the rear of the tank allowing air to enter when the fuel rushes away from it when the saw is tilted forward.

 

[blsnelling]

Is the tank full with mix? Check the fuel hose it might be split where it joins the elbow connector.

Pooled fuel being displaced would cause the saw to load up/stall.

+1

 

[markvanzee]

+1,..that saw is running lean when tipped forward, check out your fuel line , check to see where the end of thre fuel line and filter is positioned, it might be hung up at the rear of the tank allowing air to enter when the fuel rushes away from it when the saw is tilted forward.

thanks pioneerguy and jdnicol, but i've already replaced the fuel lines hoping to eliminate the high idle problem. no luck but i will look at the filter inside maybe it is indeed hung up.

 

[pioneerguy600]

thanks pioneerguy and jdnicol, but i've already replaced the fuel lines hoping to eliminate the high idle problem. no luck but i will look at the filter inside maybe it is indeed hung up.

Keep working on and looking for some reason for the engine to run lean, its not getting enough fuel when tipped forward. Did you rebuild your carb?

 

[markvanzee]

Keep working on and looking for some reason for the engine to run lean, its not getting enough fuel when tipped forward. Did you rebuild your carb?

no i haven't, but i've opened it and it looked very clean, so i thought i wouldn't be necissary.

 

[pioneerguy600]

no i haven't, but i've opened it and it looked very clean, so i thought i wouldn't be necissary.

Might be the next step if all the fuel lines and the filter position check out ok.

 

[JDNicol]

Have you owned the saw long? Has it always done it or is it a recent occurence?

 

[barneyrb]

Am I wrong or did they build a 070 with a/v. I'm thinking 090 av

 

[blsnelling]

Am I wrong or did they build a 070 with a/v. I'm thinking 090 av

I was wondering the same thing.

 

[Phil_C]

Am I wrong or did they build a 070 with a/v. I'm thinking 090 av

According to the IPL I have for the 070 they had both styles of AV. The earlier style like the OP's and the later style with the modern looking rear handle.

Regards

Phil

 

[markvanzee]

thanks for all the help guys,

brought the saw to the local shop to get the crank seals replaced. hope that solves the problem if not i'll rebuild the carburetor

 

[Steffen]

Did you find the fault??

 

[markvanzee]

hello steffen,

i have had the crank seals replaced, but then i had an issue with the starter pawls not engaging the starter. since then i have been very busy and haven't had time to look into the saw. i am currently rebuilding 2 stihl 026C pro's. when i fix the issue i will post it here. i also plan to mount a 090 cylinder and piston to make this a milling saw.

greetings mark