This came up & I wanted to know if there was a difference in running temperature between a motor that has suffered the Deadly- "Squeal of death", caused by falling over & prop.sticking in the sand vs a stock motor. The flight - 7 min. of Litchi & another 8 min. of just bombing around a 850' open field, Return to home & hand caught- motor temps immediatetly taken by a infrared handheld, pointed at side of sliver motor shroud. Any slight changes are distance I held the gun from motor casing , I think. Front motors- left- 69-71.5 F. right- identical to left- 69.5-72 F. Rear left- 70-72 F. rear right- -74-76 F. (squealer!) Any thoughts on what temperature one should start worrying about motor life or is there such a motor tell?