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Old 06-30-2005, 07:58 PM
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A lot of people on here are going to say that anything lower than 230 degrees would be good, but these TRX 2.5 engines do run hot! As kcsoa22 stated, anything below 270 degrees is fine. You'll find out that newer engines tends to run hotter than the worn-in engines, because the piston and sleeve fit is still tight. Also an aftermarket cooling head should drop at least 10-20 degrees too. My Revo's 2.5R refuses to run lower than 240 degrees, and it seems to be alright.
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