Husqvarna 455 Rancher

[spudulike]

Has the coil gap been set correctly? If it is too big, the spark can fail as the coil warms up!

[TommyT315]

I set it with a business card like I usually do. 

Got a reply from Husqvarna and they think it is more likely to be a bad new tank vent. 

So I will tomorrow remove the vent all together and see how the saw works. Hopefully that will be the problem and get a replacement from the dealer. Here’s hoping ? 

[spudulike]

Why don't you just suck air from the fuel tank through the fuel line and see if the vacuum drops as it should as air enters the tank through the vent. Your leak-down tester will do the job.

[TommyT315]

I have a vacuum testing kit and going what you say I could hook it up to the fuel line and if the vent is blocked then the pressure should get higher and higher. 

I think I’m right in my logic, am I?

[spudulike]

Yes, spot on, you are basically sucking air out replicating fuel leaving the tank and you would expect air to enter via the vent returning the tank to atmospheric pressure (no pressure or vacuum -Zero) in under a second with no build up of vacuum in the tank that remains present for a couple of seconds or more. 

You may have sealed the new vent in with some compound that may have sealed the vent? 

[TommyT315]

Cheers Spudulike for all the help