Thread: Two Stroke Oils/Fuel

So… I bought a brush cutter from ebay for the grand sum of $90! The manual says to use a two stroke mix of 25:1.

My question is, I have 50:1 oil (unmixed) that I use for my Stihl chainsaw - is this oil different to 25:1 oil or is it OK to just put 50:1 oil in at 25:1 mix - ie. double what I use for my chainsaw?

Thanks.

good god, I thought I escaped the dreaded 2t oil threads on the chainsaw forum.

50-1 is not extreme at all....there are some oils that will run at 100-1 (not that I would....)

Most Brand names (stihl, husky, dolmar etc) will specifiy to run THEIR OWN brand oil at 50-1, but if using ANYTHING else, 25-1.

Problem is, the motor is not tuned for both.....

A good example is my neighbour bough a blower from bunnings (not a cheap cheap one) he read the manual and followed the advise of using 25-1 when not using manufactures brand. After 6 months the blower was running poor and lacked power. A simple muffler clean (sootted up) and fresh fuel at 50-1 made all the difference......simply the motor wasnt tuned to 25-1

Any good quality oil made for AIR COOLED engine will be fine at 50-1 (tuned correctly of coarse)

no problem running at 25-1 either (if engine is tuned there)

I personally run my work stuff (blower, concrete cut off saw) at 40-1....any of my saws that are modded get 32-1

I only use BP ultimate 98 octane (NO ethonal...very important)

Fuel stored over 4 weeks gets used for cleaner.....any tool going to sit for longer than 2 weeks, gets drained and then started and run at idle to clear fuel lines.

and btw it has been proven that a lower ratio (ie MORE oil) produces more power....to a point, somewhere about 12-1 it stops making more)