Husqvarna 550xp pop up

[Stump Shot]

Don't get him started.....again

Gotta learn sometime, now is as good as any.

 

[P.M.P.]

Is this Computer aided carbureted space plastic that replaced one of the best models of a saw running yet?

 

[WoodsliverDan]

What heat problems? The only one here is the lack thereof.
View attachment 154042

Heated carburetor at the flick of a switch along with winter air filter.
View attachment 154041
550XPG


So, ask yourself, what really is the problems with 550?

I have an xpg model as well.

 

[WoodsliverDan]

I just got a call from.the dealer yesterday when I was ar work that some of my part arrived. I haven't worked on them the last couple of days. I wont have a chance to work on them today either, family things.

 

[Wonkydonkey]

Umm, this thread almost had me piss my panties a few times,

I’ve learnt a lot about 550’s as well

Cheers..

 

[Porkgasm]

Fallout 76 on Xbox anyone?

 

[nohoff]

Battlefield V on the PC

 

[mdavlee]

Speaking of which, just said hello to Mission BBQ from yesterdays lunch

Mission BBQ is good stuff. [emoji23] I’d like to be sitting down to a plate of it right now myself

 

[Dub11]

What heat problems? The only one here is the lack thereof.
View attachment 154042

Heated carburetor at the flick of a switch along with winter air filter.
View attachment 154041
550XPG


So, ask yourself, what really is the problems with 550?

Huh?

 

[Terry Syd]

I saw this thread and thought it might have an interesting discussion on a pop-up for a Husky strato - then I thought I had accidentally ended up on AS.

So, I read through the entire thread. I'm still waiting for Wayne (Dub11) to get back to us about the finger and farting. Like, what happens? Does it push the finger out? Does it make squeaky noises?

Now about the hard starting issue while hot. Maybe I have the answer.

My Husky 450 almost drove me nuts with the same hard re-starting issue. I finally figured it out - and when you guys mentioned the primer bulb in this thread, it may be the same problem I had.

On the 450 the primer bulb was fed directly from the fuel tank. When you shut off and the tank gets hot it pressurizes the fuel tank. Fuel is pushed up through the primer bulb and into the carb.

The valves on the primer bulb only go one way - to the carb. The inlet to the carb from the bulb is not controlled by a valve like the metering valve, it is a straight shot into the carb. The fuel keeps flowing and the only place it can go is into the engine. The engine gets flooded.

I blocked off the primer bulb and no more difficult re-starting problems.

 

[wcorey]

I saw this thread and thought it might have an interesting discussion on a pop-up for a Husky strato - then I thought I had accidentally ended up on AS.

So, I read through the entire thread. I'm still waiting for Wayne (Dub11) to get back to us about the finger and farting. Like, what happens? Does it push the finger out? Does it make squeaky noises?

Now about the hard starting issue while hot. Maybe I have the answer.

My Husky 450 almost drove me nuts with the same hard re-starting issue. I finally figured it out - and when you guys mentioned the primer bulb in this thread, it may be the same problem I had.

On the 450 the primer bulb was fed directly from the fuel tank. When you shut off and the tank gets hot it pressurizes the fuel tank. Fuel is pushed up through the primer bulb and into the carb.

The valves on the primer bulb only go one way - to the carb. The inlet to the carb from the bulb is not controlled by a valve like the metering valve, it is a straight shot into the carb. The fuel keeps flowing and the only place it can go is into the engine. The engine gets flooded.

I blocked off the primer bulb and no more difficult re-starting problems.

If that was the case then why doesn't it flood the saw when the bulb is depressed multiple times?
I thought the bulb just circulated fuel through the pump side of the carb and the excess went back around to the tank.

Seems like the tank pressure would need to be greater than the popoff to create a flooding condition.

 

[Terry Syd]

I thought the bulb just circulated fuel through the pump side of the carb and the excess went back around to the tank.

On my saw, and probably the 550, there is no route back to the tank. The metering valve shuts off the inlet and the only place the fuel can go is through the carb circuits and into the engine.

 

[WoodsliverDan]

I've heard both ways now. The primer bulb is used to push cooler fuel into the carb. And that the primer bulb should be deleted.

 

[huskyboy]

If that was the case then why doesn't it flood the saw when the bulb is depressed multiple times?
I thought the bulb just circulated fuel through the pump side of the carb and the excess went back around to the tank.

Seems like the tank pressure would need to be greater than the popoff to create a flooding condition.

+1

 

[Terry Syd]

Seems like the tank pressure would need to be greater than the popoff to create a flooding condition.

The primer bulb circuit doesn't go through the metering valve, it goes directly into the wetside of the carb (at least it did on the 450).

If the primer bulb has a simple flapper valve, then the fuel can push past it into the carb.

 

[RIDE-RED 350r]

And am I wrong to take an eductaed guess that EPA regulations against fuel evaporation into the atmoshpere has given us tank vents that are check valved? Meaning: air can come into the tank as fuel is consumed, but the tank is not allowed to "breathe" if pressure starts to build, for example when the saw is left sitting in direct sunlight or as you stated, the tank gets warm rapidly...

I can see fuel being force fed into a carb and engine with a situation like that.

 

[wcorey]

On my saw, and probably the 550, there is no route back to the tank. The metering valve shuts off the inlet and the only place the fuel can go is through the carb circuits and into the engine.

So then you're saying it can be used in place of the choke for cold starting?

 

[Simondo]

Primer bulbs.. pull ..fuel through the carb I find so there should be no over fuelling when using them .Back pressure from the tank is another matter.

 

[Terry Syd]

So then you're saying it can be used in place of the choke for cold starting?

If you keep pumping the bulb after the wetside is primed, it will pump fuel into the engine. So yeah, you could use it like a choke to load extra fuel into the intake tract.

 

[Terry Syd]

Primer bulbs.. pull ..fuel through the carb

Not on my 450, it pumped fuel INTO the carb. I don't know how the 550 is set up, perhaps someone could check.