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• PRO

  Harry@VWGS February 22, 2017 at 6:06pm

  Are you allowing space for breathing/expansion within the fuel can?
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  Craig Flatters February 22, 2017 at 6:06pm

  They hold about 6. 5 lts is the recommended fill line.
• PRO

  Oliver Quelch February 22, 2017 at 6:15pm

  I'm assuming you fill straight from the pump into the 5L Can that you mix your 2 stroke with?

  Just have a check to see if you have a max fill line on the Can, as that'll be the actual 5L limit, if not....change petrol station 
• PRO

  Richard Gadsby February 22, 2017 at 6:19pm

  6 sounds about right. It won't be the pump calibration they won't be wrong!
  Just use the pump read out to only add 5 litres to the can
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  Graeme Brown February 22, 2017 at 6:50pm

  Put the two stroke dose in the can and use the pump metre to measure out 5l into the can done
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  Craig Flatters February 22, 2017 at 7:29pm

  As a side question........

  If your mix was slightly off, say 6 lts of petrol and maybe just over 100ml of mix.

  Would it be that big of a deal anyway?

  Thank you, Craig.
  • PRO

    Gary RK > Craig Flatters February 22, 2017 at 7:43pm

    Yes crucial as your mix would 20-25% to weak/lean. This would be made worse with cheaper 2 stroke oil. I'd say from experience you'd risk reduced performance. hotter engine, piston pick up and then seizure.

    Most 5L cans hold more that that, plus if used in summer they will physically expand and not retract, so unless you dispense exactly 5L of fuel, your measured oil mix will cause subsequent problems
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      Craig Flatters > Gary RK February 22, 2017 at 7:53pm

      Thank you Gary. I shall now be more on top with my mixing.
    • PRO

      Richard Gadsby > Gary RK February 22, 2017 at 8:04pm

      Unless as Darren has found out by accident it does not make a huge amount of difference?
      I suspect that 25:1 is actually too much so the manufacturers are covering themselves?
      Unless of course you are using something full revs all the time.
      • PRO

        Gary RK > Richard Gadsby February 22, 2017 at 8:15pm

        Once you know the impact, why would you not then do it correctly in the future ?

        They state it for a reason.....Sure, a one off mistake - you may get away from it, but most Stihl items are design to be run at full revs.

        Imagine this scenario:

        Hi Mr Stihl Dealer....I've just sh*gged my Strimmer. It's seized....

        Mr Dealer responds...Ok, what mix did you use...

        Dunno, used El Crappo oil from B&Q.  Maybe 30:1, maybe 50:1  but, hey I'm covered as I'm sure Stihl make allowances. So, Can I have no one please under warranty

        Mr Dealer.....Go forth young man...:D

        Lastly, drop the exhaust of a Stihl unit, turn over the engine and take a look thru exhaust port at the piston skirt. If it's heavily lined, It's picked up and will not be running 100%