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According to this paper http://www.bridgestonemotorcycle.com/documents/oilpremix6.pdf the maximum safe cylinder head temperature is 425 to 450 degrees farenheit.
When I was testing my own high compression head with squish band the temperature got up to 425 degrees. That was with only 155psi cranking pressure. I think most of the high compression heads create more pressure than that. And I was using the Jaguar CDI which reduces head temperature a bit because the timing is less advanced that the stock ignition.
If you have a high compression head you definitely need to monitor the head temp with a gauge. The one I used which worked good was from JNMotors at http://www.jnmotorsbikes.com/product_p/jnm1183.htm
When I was testing my own high compression head with squish band the temperature got up to 425 degrees. That was with only 155psi cranking pressure. I think most of the high compression heads create more pressure than that. And I was using the Jaguar CDI which reduces head temperature a bit because the timing is less advanced that the stock ignition.
If you have a high compression head you definitely need to monitor the head temp with a gauge. The one I used which worked good was from JNMotors at http://www.jnmotorsbikes.com/product_p/jnm1183.htm