T540xp Will not rev

[Ryan625]

T540xp has been recently rebuilt, starts good, does idle but idles better on its side (sometimes dies when straight up) New carb. When throttle is applied it will not spin the chain and bogs down until it dies. Seems to dump fuel. Any help will be appreciated in locating the source of this problem

 

[peatff]

Have you done a reset on it ?

[Stubby]

The change in attitude affecting the idle can indicate an air leak . as a hose is pulled slightly it opens up a small split . Could be the impulse hose or a fuel line . Could also be the crank seals but maybe not if its just been rebuilt .  

[Ryan625]

The main issue really is the fact that it will not rev at all, it sounds like it's sufficating itself until it dies but not while at idle. 

New autotune module with the carb, I will look into the fuel lines

 

 

 

[Mark_Skyland]

Did you install the carb yourself as it needs connecting to the husky computer to install firmware?

[spudulike]

Yes, you can't just swap carbs out on these saws, they don't work like that.

[Ryan625]

1 hour ago, Mark_Skyland said:

Did you install the carb yourself as it needs connecting to the husky computer to install firmware?

I have, I will have to look into husky dealers who can install the firmware

I've installed a new carb on a 545 and swapped the autotunes that seemed to work, I could give that a try and see if I get anywhere 

 

How much will I be looking at spending if I have to get firmware installed? 

[Mark_Skyland]

Around £15-20, maybe. You need the serial number from the coil to match it to the carb.

That is why we dont sell autotune carbs online. The dealer you bought it from deserves a bit of a slap but looking online there are loads of people selling autotune carbs with no info that they wont work properly without a dealers bit of help. 

 

[Ryan625]

Switching autotunes fixed the problem but revved it up without a bar on and clutch flew away along with every single needle of the bearing 

[spudulike]

Ah, some twat on here said that was impossible and would never happen....even though I have had the same happen as had others.

Glad you are still here to write about it!!