MS 261 Fuel Mix

[ADB328]

Thanks i was pretty sure i was right its just we have had a 261 fresh from the shop for a few months and hasn't been right since we got it, everytime it goes back for "fixing" we are told mix is wrong and i was 99% sure this wasn't the case.

 

Thanks

[GardenKit]

This is interesting.

Assuming the dealer knows his stuff, to back up his diagnosis he will drain your mix, refill with his known mix and tune accordingly.

 

The saw should then run perfectly on that tankful. If it does, but plays up when you have refilled with your mix his diagnosis is correct.

 

So then you need to check your mix.

 

How do you measure your oil, is it accurate so that you get exactly 100ml per 5litres?

 

What quality oil do you use?

 

Is your petrol fresh, i.e. less than 30 days old and preferably not from a supermarket.

 

If you mix is perfect then you have a problem that needs further attention.

[samthescam]

This is interesting.

Assuming the dealer knows his stuff, to back up his diagnosis he will drain your mix, refill with his known mix and tune accordingly.

 

The saw should then run perfectly on that tankful. If it does, but plays up when you have refilled with your mix his diagnosis is correct.

 

So then you need to check your mix.

 

How do you measure your oil, is it accurate so that you get exactly 100ml per 5litres?

 

What quality oil do you use?

 

Is your petrol fresh, i.e. less than 30 days old and preferably not from a supermarket.

 

If you mix is perfect then you have a problem that needs further attention.

 

You know that the petrol at supermarkets come from the same refineries as all the other garages don't you... Infact the fuel just comes from the nearest... The only difference is the injector cleaner and other stuff thats thrown into it, can't imagine that affecting a 2 stroke.

[GardenKit]

Correct, it comes from the same refineries, but it is my understanding that the supermarkets take the fuel that is is approaching its sell by date, the logic being that it is sold quickly and wont effect the average car. On this basis, petrol bought in cans will be approaching 30 days before sale. I also understand that many supermarket fuels contain more ethanol than normal. Ethanol does petrol no favours.

Of course, this is only my understanding and I may be wrong.

 

I have however had many cases of carburation troubles with fuel bought at the local supermarket, certainly enough to convince me of the difference.

I will never buy their fuel for my car or my business as I can do without the hastle.

I also know technicians in the car trade who feel the same.

 

My advice therefore still stands.

[TimberCutterDartmoor]

You know that the petrol at supermarkets come from the same refineries as all the other garages don't you... Infact the fuel just comes from the nearest... The only difference is the injector cleaner and other stuff thats thrown into it, can't imagine that affecting a 2 stroke.

 

Correct, it comes from the same refineries, but it is my understanding that the supermarkets take the fuel that is is approaching its sell by date, the logic being that it is sold quickly and wont effect the average car. On this basis, petrol bought in cans will be approaching 30 days before sale. I also understand that many supermarket fuels contain more ethanol than normal. Ethanol does petrol no favours.

Of course, this is only my understanding and I may be wrong.

 

I have however had many cases of carburation troubles with fuel bought at the local supermarket, certainly enough to convince me of the difference.

I will never buy their fuel for my car or my business as I can do without the hastle.

I also know technicians in the car trade who feel the same.

 

My advice therefore still stands.

 

Oh no not again! I've said in countless threads on here before, drawing on a decent amount of time and experience in the gas and oil industry (pre-forestry) that supermarket fuels ARE inferior to the products on the forecourt of Esso, Texaco, Shell, BP et al. Yes the Tesco / Sains / Morrisons / Asda fuels roll out of the same gates but I can guarantee you 100% it aint the same gasoline / derv. The refineries make more than a handful of gasoline products and blends you know!

 

http://arbtalk.co.uk/forum/chainsaws/33803-anyone-having-problems-new-560xp-9.html

[GardenKit]

:thumbup:

Remember incident with Tesco fuel a few years back which killed loads of fuel pumps?

[ADB328]

If you mix is perfect then you have a problem that needs further attention.

 

This

 

And yes i've been mixing fuel for a long time and never before had problems this is also why i rfuse to believe that its fuel related, its going off to another fitter next week will be interested to see what he says.

[Dean O]

Thanks i was pretty sure i was right its just we have had a 261 fresh from the shop for a few months and hasn't been right since we got it, everytime it goes back for "fixing" we are told mix is wrong and i was 99% sure this wasn't the case.

 

Thanks

 

We must have a saw from the same batch! - its latest problem is poor running.

(p.s we us texaco petrol)