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[Field Marshal Dr. Opti]

The chain is manufactured by Oregon and relatively new.

My problem is that I can't get an even tension on the chain when I move it by hand with the brake off.

It has distinct loose and tight spots ranging from a few mm to around an inch.

Is the chain already f*ucked or could there be other reasons?......bent bar?...worn sprocket?

[Field Marshal Dr. Opti]

58cc 2 stroke lump of Chinky origin.

[ronnyd]

You've probably answered your own question. 

[STEMO]

Just fire it up and set to work. What could possibly go wrong?

[Field Marshal Dr. Opti]

Just fire it up and set to work. What could possibly go wrong?

I have.

After 5 minutes of cutting the chain is slack as the tits and fanny of a 45 year old woman who has just popped out her seventh sprog....if you get the idea.

[redelitev6]

Sounds like it's well shagged , and the chain doesn't sound too good either 

[Lizzie Zoom]

All sounds very dangerous to me!

I have never had any desire to pick up one of those limb amputaters!

[Marks DTM Calib]

Is the chain oiler working properly?

[YZ250]

How are you adjusting the chain, not just by pulling the bar out and tightening the casing nut I assume. The bar has just a guide groove, so has no influence on varying tightness. You adjust the tension using the adjustment screw under the chain, so that each rotation is the same degree of movement but I have seen the adjustment screw not set correctly, which allows the tension of the bar to shift during manual rotation.
I'll bet the adjustment screw isn't set correctly. 

[Field Marshal Dr. Opti]

Is the chain oiler working properly?

Plenty of lube from what I can see.

[Field Marshal Dr. Opti]

How are you adjusting the chain, not just by pulling the bar out and tightening the casing nut I assume. The bar has just a guide groove, so has no influence on varying tightness. You adjust the tension using the adjustment screw under the chain, so that each rotation is the same degree of movement but I have seen the adjustment screw not set correctly, which allows the tension of the bar to shift during manual rotation.
I'll bet the adjustment screw isn't set correctly. 

I am using this. At the moment I have removed the bar, chain, and  chain tension screw tension mechanism. They were covered in a combination of oil and sawdust but seem free enough.

I'll put it back together and see if I can get the tension to be more even.

The bar itself seems to be flat, straight, and in reasonable condition, without too much wear.

[Marks DTM Calib]

So the usual is the oiler, it gets blocked up with saw dust.

What then happens is the chain gets hot (made worse if its not sharp), expands and appears loose after some use (tends to recover as it cools).

The oiler should be chucking out quite a bit of oil, this helps cool the chain as well as lube it.

I would start by sharpening the chain well, check the oil passages (particularly in the chain bar), clean it well, adjust it all up, and having another go

[ronnyd]

With all your supposed wealth, just get man in who has a real chainsaw and pay him with some of your groats. 

[STEMO]

With all your supposed wealth, just get man in who has a real chainsaw and pay him with some of your groats. 

He acquired his wealth by being a tight barsteward.

[Doctor Gollum]

Not sure that a tree surgeon would want his groats...