Stihl 500i

[nohoff]

6.8 hp /6.2 kg/ 80cm³

 

[ABarrick]

It's not 72cc. According to the press release its 80cc.

 

[Locust Cutter]

I wonder if it's really only 6.8bhp, or more, but they're advertising it short to protect MS661 sales (like the Turbo IDI 7.3 diesel vs the old 460 V8)?

 

[earlthegoat2]

Somebody please tell me what the deal is with the primer button. They never had them on the carbureted saws and put one on an injected one?

 

[DND 9000]

The primer bulb is there to fill the housing of the fuel pump with fuel. It`s a diaphragm fuel pump just on any other diaphragm carburetor too. It works the same. When the housing of the pump is filled with fuel through pressing the primer bulb, the injector can bring the fuel "faster" or immediately into the crankcase when the starter is pulled. Otherwise without pressing the primer bulb, the diaphragm pump would have to pump through pulling the starter rope.

 

[Woodpecker]

I wonder if it's really only 6.8bhp, or more, but they're advertising it short to protect MS661 sales (like the Turbo IDI 7.3 diesel vs the old 460 V8)?

That wouldn't be surprising. Even if the hp spec is accurate, I bet a couple mods would have it running right with a 661 at nearly 3 pounds lighter.

 

[earlthegoat2]

. Otherwise without pressing the primer bulb, the diaphragm pump would have to pump through pulling the starter rope.

Pumping the diaphragm by pulling the starter rope worked for quite a long time prior to this. I am not against it necessarily but why now? When autos went to fuel injection you no longer needed a choke or to “pump” the throttle to start the vehicle. Seems like a step backward on a saw that has the latest technology in fuel delivery and management.

So it’s more of an easy start feature than a necessity?

 

[tree monkey]

the primer is there to pressurize the system, won't start without it

 

[cus_deluxe]

Autos also have electronic fuel pumps to prime the system.

 

[DND 9000]

the primer is there to pressurize the system, won't start without it

I looked around and see now that you are right. So my post above was *B-S...., I`m sorry. As I`ve learned now the injection pressure is around 0,2bar.

 

[earlthegoat2]

There we go. That makes sense.

 

[tree monkey]

need to push it 10 times every time you want to start the saw

 

[Dub11]

need to push it 10 times every time you want to start the saw

That'll make for some interesting cant racing.

 

[ABarrick]

need to push it 10 times every time you want to start the saw

What's the bleed down time? As in, if you shut it off for 10, 20, 30 seconds do you need to re-prime, or will it retain enough pressure for x amount of time to allow a restart?

 

[nohoff]

You can Restart 5 min After shutdown without the primer