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I have just bought a secondhand McCulloch petrol hedge trimmer, with no manual. Please can anyone tell me the ratio of oil to petrol mix? Thanks in advance

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Ushally 50:1

Posted on May 29, 2011

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  • Wesley Gardner
    Wesley Gardner May 29, 2011

    ratios can range from 25:1 gas to oil and go up to 50:1 for certain specially blended oils for the high performance professional grade trimmer. If you can't find the mix ratio anywhere for your trimmer, start a mix at the lower end, around 30:1. Run through a tank of that while trimming, and take careful note of the acceleration and high-speed performance. Slowly lean out the mixture up to 40:1 and run another tank of gas. If the engine's slow or sluggish or has poor high-end performance, you can lean the formula up to 50:1, but note if your engine isn't designed to handle this, you can wear out seals, rings and other sensitive parts in your internal engine with a too lean mixture

  • Wesley Gardner
    Wesley Gardner May 29, 2011

    so start by running a 30:1 ratio and see how that goes for you I know I run a 40:1 myself for my husqavarna

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50 :1 is using top quality 2 stroke oil
and is 20 mills of oil per 1.0 litre of petrol that you mix

i remember it as 1000 divided by 50 = 20 therefore 20 mils per litre
is 50:1 ratio

cheers pauly46

Posted on Jun 04, 2011

  • paul nielsen Jun 04, 2011

    50 :1 is using top quality 2 stroke oil
    and is 20 mills of oil per 1.0 litre of petrol that you mix

    i remember it as 1000 divided by 50 = 20 therefore 20 mils per litre
    is 50:1 ratio

    cheers pauly46

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I recommend contacting your local authorized service center for assistance.

You may contact the manufacturer, download manuals, check fuel/oil ratios, order parts, find your local service center, and view other resources using these links:

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Use the provided links:

You may contact the manufacturer, download manuals, check fuel/oil ratios, order parts, find your local service center, and view other resources using these links:

Contact us
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I trust this information has proven beneficial.

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http://support.mtdproducts.com/app/answers/detail/a_id/347/~/two-cycle-engine-fuel%3Aoil-mixture-chart

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cheers pauly46

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2 Answers

My mcculloch petrol hedgetrimmer wont start, the pull cord has a lot of resistance. I have changed the spark plug and cleaned the air filter but still no joy.Interestingly When i remove the spark plug i...


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