Tecumseh OVXL120 ungoverned stock motor. I finaly got a chance to run it very hard the other day and I happened to have my IR thermometer with me so I checked temp ranges around the motor. The block ran between 200 and 220, intake/carb area was around 175, Head temps were slightly above the block nearing 300 in places but because of cooling fins the reading varried greatly, exhaust header (factory stamped one) was 450 and 1-1/4 exhaust pipe (after header and about 12" in length) was 375 or so. exhaust gas at end of 1-1/2" (about 14" long) pipe was 89. I don't have a way of measuring EGT at any other location.
Now for the question(s);
How close to good ranges are these numbers? I read some posts about temperature and A/F mix but I'm not sure I understand it, maybe someone can explain some more about the subject.
Toad
