What is the oil to gas mix ratio ?:? stihl fs 45

Hello Bob Breedon,

Big fan of STIHL... Check Fuel 50:1 mix ratio...!!
See owners manual:
Stihl FS 36 Instruction Manual Page 18

A very common mistake... is to use GASOLINE... and
forge to put in the 2-cycle oil...

As soon as the unit heats up... It will stop
(seize - in fact)...

Been there (forgot about that)

Carnac the Magnificent

Stihl FS 45 Manual

only has limited hours of use ....less than 200 hrs normally
carby or coil issues stop these things
if oil mix isnt correct
the rings /motor will loose compression when hot

http://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/FS-45-46-Weed-Trimmer-Instruction-Manual.pdf


http://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/FS-45-46-Weed-Trimmer-Instruction-Manual.pdf

Hi, 25 to 1 with normal 2 stroke oil or 50 to 1 with stihl 2 stroke oil. Regards Phil.

Stihl chainsaws are 1:50 oil to gas ratio. Make sure you use good high-quality 2-stroke oil, preferably that which is made by Stihl.

Fuel/Oil Mixture

1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH
   Lou

Fuel/Oil Mixture

1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
2. Most gas in the US of A contains ethanol; not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH
   Lou

Use a quality 2 cycle oil and mix it to the oil manufacturer's recommended ratio. Today it is usually 50:1.
Fuel in the USA contains ethanol; try to use up your mix in a month or less. HTH
Lou

I have a Stihl FS 45 and have had problems with it running for a short time then cutting out. The problem is like to be either- the filter attached to end end of the fuel pick hose that goes down into the fuel tank is blocked or- there is a crackor split in the corrugated section of the fuel pick up hose between the fuel tank and the carburettor. If such a crack or split exists it will cause air to be sucked in with the fuel upsetting the fuel/air ratio. A new hose not adjustment is the only cure