# 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 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 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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cheers pauly46

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### 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...

The fact that your engine turns over easily with the spark plug removed simply means that, with the plug removed, there is no compression, so the piston goes up and down very easily.
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Hope that you are lucky enough that the carb cleaner, a good dose, will work. If not, you may have to disassemble and clean out your carb. (if you've never done that, a series of digital camera photos so you know where to put things back is a good idea).

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Most newer 2 stroke engines run on 1 part oil to 50 parts gas.
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