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Not on the BR600's but have used them on HS81's. They work, but need to be set up as per manual. Seem ok, but hard to compare against original (fuel consumption etc). As a non-safety item I feel reasonably comfortable using them. I would not take that attitude if the part was a key safety item.
Thanks for the reply Gary. I'll give one a try I think...
This is one of our spares for an HS81/86. I'm staggered at how such a complex spare part can be purchased in the UK for under £20.
There must be several 'middlemen' involved before it even gets to us....
If they built it better in the first place maybe it would not break?
??? It's the cheap ones (~£20) that last and are not breaking which are being used to replace the faulty original Stihl items.
The Stihl items cost ~£100+...
:confused:
Thought you meant they were original ones for £20.
I've been lucky and never had one break
Take a look at the huge number of small, intricate precision parts in the average complex carb.
It has a vital role in delivering the right, metered amount of fuel at all times, in all conditions.
Old technology does not remove it from being a complex piece of engineering.
It won't work properly in all conditions without being retuned unless it has auto tune.
They are cheap because they are made in the millions.
Ok, I'll bite...
Wiki : "A carburetor (American and Canadian spelling), carburator, carburettor, or carburetter .... To function correctly under all these conditions, most carburetors contain a complex set of mechanisms to support several different operating modes......
This job would be simple if air and petrol were ideal fluids; in practice, however, their deviations from ideal behavior due to viscosity, fluid drag, inertia, etc. require a great deal of complexity to compensate for exceptionally high or low engine speeds. A carburetor must provide the proper fuel/air mixture across a wide range of ambient temperatures, atmospheric pressures, engine speeds and loads, and centrifugal forces:
In addition, modern carburetors are required to do this while maintaining low rates of exhaust emissions.
To function correctly under all these conditions, most carburetors contain a complex set of mechanisms to support several different operating modes, called circuits."
If you look at an exploded view of a 'basic' Walbro Carb it suggests they are far from simple:
I'd call that 'complex', wouln't you ? Mass production does not negate the complexity of the item and most carbs in use work across a huge operating range as standard
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