Water temp 130 F. Max egt 1280 (and I mean max. 1300+ and the piston becomes one with the cylinder). Egt should be measured 10cm from the exhaust side of the piston. Get the CR125 jetting app that is avaiable. It is great for sprint tracks, and more or less dead-on (Keihen carbs only, mind you). Add 15 to 20 sizes to the app’s main jet for road racing. If the engine revs to max rpm on the stand at wot and doesnt go blahhhh, its too lean. Never go more than 5 hours on a piston and ring. All of this learned by me the hard way.