Stubborn Chainsaw Running Issue

[Muddy42]

Hi all.  I am just updating this thread / issue.  Unfortunately the problem air leak still persists.  I have tried swapping the carb (no difference). I have checked the fuel lines and purge button (all hold air).  I have just attached a video of the saw running just now, a spray of carb cleaner seems to kill the saw at a particular part between the carb and the cylinder - its a sort of flimsy tube of plastic (sorry I am not sure what it is called) covered with a rubber band.  I have had both of these off, cleaned it and returned it.  I couldn't see any issues other than the dirt.

 

Any ideas what I should do next?  Can this part be replaced?  Gasket sealant? Should I give up and ditch the saw!

 

Thanks in advance.

 

 

Edited December 20, 2022 by Muddy42

[adw]

Attached.

 

[adw]

Mark 1

 

[Stubby]

55 minutes ago, Muddy42 said:

Hi all.  I am just updating this thread / issue.  Unfortunately the problem air leak still persists.  I have tried swapping the carb (no difference). I have checked the fuel lines and purge button (all hold air).  I have just attached a video of the saw running just now, a spray of carb cleaner seems to kill the saw at a particular part between the carb and the cylinder - its a sort of flimsy tube of plastic (sorry I am not sure what it is called) covered with a rubber band.  I have had both of these off, cleaned it and returned it.  I couldn't see any issues other than the dirt.

 

Any ideas what I should do next?  Can this part be replaced?  Gasket sealant? Should I give up and ditch the saw!

 

Thanks in advance.

 

 

Could be the impulse pipe 

[Muddy42]

1 hour ago, Stubby said:

Could be the impulse pipe 

Thanks. The pipe seems fine. I took it off the saw completely and when I connect it to the old carb and blow through it, all I can hear is a diaphram in the carb moving, no noticeable air leaks. Mysterious

[Muddy42]

Ive spent a few more hours on the saw with no luck, all the pipes and the purge bulb are fine. I still think there is an issue with the various rubber/plastic tubes between the carb and the cylinder (the rubber part is not on @adw ‘s diagram above. I dissassembled these with extreme difficulty and think Ive found the leak, but I cant see myself being able to put these back together properly.

 

i think I’ll call it quits and toss the saw - its a cheap rubbish one that isnt well designed for tinkering with. Oh well at least it was free! Thanks for everyone’s advice, I have learned a lot.

 

[adw]

The induction tube is item 4 in the list 504201201, it is a small assembly where the rubber is molded to the alloy frame,it also incorporates the impulse pipe, it needs to seal onto the inlet side of the cylinder, if the face is deformed in any way it will not seal properly or will impede the impulse.

Dont give up its all a learning curve.

[peatff]

12 hours ago, Muddy42 said:

i think I’ll call it quits and toss the saw - its a cheap rubbish one that isnt well designed for tinkering with. Oh well at least it was free! Thanks for everyone’s advice, I have learned a lot.

 

 

Stick it in a box and send it to me I can use the spares😉

[Muddy42]

17 hours ago, adw said:

The induction tube is item 4 in the list 504201201, it is a small assembly where the rubber is molded to the alloy frame,it also incorporates the impulse pipe, it needs to seal onto the inlet side of the cylinder, if the face is deformed in any way it will not seal properly or will impede the impulse.

Dont give up its all a learning curve.

Thanks. Gosh I find those Husqvarna diagrams hard to follow. Ive ordered the part and will keep going.

[adw]

Just think how good you will feel when she runs well, and all your own work, on a slightly negative note it may be a real shit to fit without lifting the cylinder.