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hi i have an old husky 254 that runs but starts over revving after a while, just wondering what sort of money it might be worth?
thanks carl

Anything from £130 - £250 depending on condition.

You may have a crank seal gone behind the oiler - it is a bugger of a job to remove the oiler pinion but is relatively easy after that.

or the fuel tank might be pressurising, i cant remember where the tank breather is on a 254 but clean it out for sure,,

Its on the end of a grey plastic tube that runs along the top of the fuel tank and exits just under the rear AV rubber on the clutch cover side.

thanks i will check out the breather, the crank seals were done seems a shame to just have it sat in the shed, ive tried a few repair shops but it still comes back the same so cant be bothered wasting more money on it.
thanks carl.

A chainsaw tank should pressurise.The vent is only there to let air in. There are two reasons for this: one is to stop fuel leaking out when the saw is used on it's side and the second is to satisfy enviromental rules which rule out venting petrol vapour.
As regards value of the saw most spares/repair saws sold on ebay don't have any money left in them by the time they are fixed.

A chainsaw tank does not usually presurise, the only cause would be the natural expansion of fuel gas with heat. This pressure is vented by the breather or it will cause an imbalance between the atmospheric pressure acting on the carb and the pressure in the fuel line.
As the tank empties it causes a vacuum which must be released by air entering through the breather or the carb will be starved of fuel.
Some primer bulb systems rely on a brief pressurisation of the tank to push some fuel into the carb faster than the normal way of the vacuum in the carb pulling it up.

Sold a very nice 254XP back end of last year on ebay and got £285 for it.