Kenskip1 said:
Al Smith,
I have a 041, manafactured in about 1974. Last fall I put a tack on it and it spun well past 10,700.This saw is a screamer.155 pounds of compression. Using Amsoil 80-1, Ken
The Hp and torque ratings were taken at a specific rpm,not necessary the max rpm,when tested.An example ,not related to saws,is a John Deere 70 gas.The governed rpm is 975 but max torque is at 805 rpm.All internal combustion engines have a power/torque curve,a power band,if you prefer.Depending on the engines design,this could be high,low ,or perhaps ,mid range on the rpm scale.As an example of design,the 038 also 61cc,is rated at 4 hp at 9000 rpm and 3.7 Newton meters at 6500 rpm.Max rpm ,given is 12,000.Once again the reference was Stihl.