Stihl 038 AVS Replacing Elbow Connector

[Charles Ekin]

Greetings

 

You guys have been really helpful with all your suggestions, but I've done all I can without pulling all my hair out, so in a last ditch attempt to try and get the problem solved, I have posted a clip on youtube showing the saw in action, so please have a look. Thanks so much in advance.

 

To see the saw in action and the problem that I have with it cutting out, please go to the following You Tube clip which my son filmed (the hyperlink tool doesn't seem to be working so please paste this url into your address bar)

 

[ame=http://www.youtube.com/watch?v=ZFfTfUWPwhY]Mysterious problem with Stihl 038 AV super chainsaw - YouTube[/ame]

 

The problem:The saw cuts beautifully in the usual vertical position but cuts out when turned horizontally into a typical felling position. It does however work well when turned into the other horizontal position.

 

What has been recommended to me: It’s a) an air intake issue which is affecting the mix, b) leaking crankcase seals, c) leaking impulse line or d) scoured piston and cylinder causing temporary compression issues.

 

What I have changed or had done:

Fuel system:

New fuel tank breather

New fuel line and filter

New carb diaphragms and gaskets (no other damage or wear visible to rest of carb)

New air filter

The carb boot (or elbow connector) has been removed, checked for damage and reconnected.

 

Piston and cylinder:

While the tank housing was opened away from the engine, the exhaust was removed and the cylinder and piston are in virtually mint condition.

 

Crankcase:

The crankcase has been professionally pressure and vacuum tested and passed both.

 

Impulse line:

No apparent sign of cracking or splits but replaced anyway.

 

So, please have a look at the video. Here’s the url again: [ame=http://www.youtube.com/watch?v=ZFfTfUWPwhY]Mysterious problem with Stihl 038 AV super chainsaw - YouTube[/ame]

 

The saw is only used for firewooding but I want to use it for felling as well but cannot due to this problem.

 

Your help would be really appreciated.

 

Many thanks

 

Charlie