mcculloch fuel mix

[armagedn]

I just picked up a really really nice sp125c(8or9 on a 10 scale i will have pics posted soon).I tried to search but for some reason i couldn't get the search menu to drop down.Mac sp125c what mix 20-1 or 40-1,it is the later 77 model with chain brake.Acresinternet site says 20-1 and 40-1depending on year.Any yellow saw lovers who have a 77 model sp125c owners manual care to chime in.I have 2 700's,1 610,1 timberbear,3516,3214,cp125,1 10-10 and run 40-1 in all of them except the cp125 which is 20-1.What about 40-1 in the cp125?

 

[056kid]

I have wonderd the same thing. My 700s call for 40:1 my super pros call for 20:1. This seems strange. Could it be that any mcc saw can be run at 20:1 or 40:1 or anything between?

I thought the old reed monster would prefer 20:1. and the ported dude 40:1.

 

[GASoline71]

Ho-hum... You can safely use modern 2 stroke oils at 40:1 or 50:1 in those old saws... I run Stihl Ultra Synthetic in all my saws at 50:1... from my newestsaws to my old Homelites from the 60's... no probs.

If it still scares ya... run 'em at 32:1 on good quality mix oil.

Gary

 

[Gearhead1]

I own a small fleet of McCullochs, including a couple of the big reed engine saws, and I run them all on 40:1 mix. This type of question has probably been discussed literally a thousand times in the chainsaw forum. The reason those old saws used a richer mix was due to the quality of two-cycle oils at that time. Many of the manufacturers' instructions even allowed for the use of SAE 30 motor oil as the mix. Because the two-cycle lubricants have been so much improved since the 50's and early 60's, you can readily use a 40:1 mix today. However, if you feel so inclined as to use the original mix recommendations, go right ahead and be prepared for the smoke cloud!