I've been running 50:1 in my old sleds for years, with no problems. The plugs last longer and of course they don't smoke as much as they did when I ran 20:1. I've been running AMSOIL in them.

 

Picked up a gallon of Amsoil HP Injector for my '72 399 and '73 440, both Cheetahs, for the races this weekend. Looks like it's going to be 30 degrees. Will I still be OK at 50:1?

 

Picked up a gallon of Amsoil HP Injector for my '72 399 and '73 440, both Cheetahs, for the races this weekend. Looks like it's going to be 30 degrees. Will I still be OK at 50:1?

Just a question, why do you run injection oil in a can shaker? Shouldn't you run an oil that is designed for premix or does the can/jug/bottle say injection and premix?I dunno

Seams premix oil is the cheapest.

 

You'll be way good with 50:1, I run 50:1 in all my sleds with HP Injector, not a problem yet.

MOD

 

I have been an antiquer for 14 yrs. 40 to 1 has served me well. Injex on a new rebuild (100% petrolem base) to seat the rings. After the first tank whatever the new sleds use is mixed 40 to 1. Yamalube stinks nicer than some of the other brands, however! scret

 

Does running a leaner mix have an effect on the viscosity of the gas? If it does affect it much, does it require any changes to the carburation? I just started running the Amsoil at 50:1. Sled seems to run slightly "doggier." Could this be due to the gas being thinner?

 

i personaly run 40:1 in my vintage jag: it runs just as fast as my friends sled.

 

32:1 in my wankel and it feel way rich. I'm going to try 40:1 on the next tank.