About 35 to 1,it is NOT "modern".Monkey Ward went out of buisness in 2001.If if fouls the plug,Change the plug to the proper heat range and size and change the oil to a modern,smokeless (I guess the are ash free)synthetic 2 stroke oil.You do not want to run those little ba----ds too lean on oil or fuel.All this info is available online,I just got a 12" wards chainsaw and in another 15 minutes I'll know who made it.
John Fisher
May 2011