Two stroke ratio calculator

Any 2-stroke premix or 2-stroke injector oil. Mix it at 40 to 1 ratio.

Have you lubricated the blades?

Could be a gear box problem.

Here's a link to the breakdown of what I hope your machine is.
http://www.magic-parts.co.uk/acatalog/Ryobi-RHT2660DA.PHP

the mix is 50:1 so the weight to volume will not matter
if you have a 1 gallon tin the amount of oil will be 1/50 of the gallon
1 gallon =128 oz so a ratio of 50: 1 would be 1 gallon of fuel to 2.6 oz of oil or 1/50 of the gallon calculate the oil required by dividing 128 by the recommended ratio figure (128 divided by 20 or 30 or 40 or 50 to get the oz amount of oil)
the thing is that the mix doesn't have to be exact as long as it is not tool short on the oil
so a mix ratio of between 30:1 to 50:1 will run in 2 stroke engines but a mix of 60:1 will cause problems
A good mix is when you can see a faint oil smoke when operating
too muck smoke and there is too much oil and no smoke too little oil
the major factor is--- do not use e-mix fuels

hi there keithprobert

the ratio to use if using top quality 2 stroke oil is 50:1 that is 20 mills of 2 stroke oil per 1.0 litre of petrol that you mix.

but if not using top quality 2 stroke oil use ratio 25:1 that is 40 mills of 2stroke oil per 1.0 litre of petrol that you mix.

cheers pauly46

dont forget the thumbs rating

Ryobi RPT 2543c This is a 2 stroke engine, so no dipstick. You mix oil with the petrol (ratio 50:1) or 200ml of two stroke oil per litre of petrol, and that's how the engine is lubricated. Hope this helps, [email protected]

You can use any brand of two stroke oil as long as it says on the container that it is suitable for air cooled engines and you need to mix it at a ratio of 25 to 1. Regards Phil

It is running too lean on the mixture, if it was new return it for re tuning, it will be an easy fix which will only take a few minutes.

You can run it with a 50:1 ratio. 1 gal gas to 2.56 oz. two stroke oil.

http://odref.com/pdf/Ryobi/
If you have your model number, an owners manual should be here with correct mixture ratio for petro to 2 stroke oil.