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I had a Triumph 650 a long time ago and everybody added oil coolers to them. I read some articles about how much better it was for the engine. I have just put a big bore kit on my bike and it runs a little hotter. It made me wonder why I haven't read anything here about adding an oil cooler.
What's up with that?
 

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The all-alloy Evo Sportster engine generally doesn't need one. No harm in installing one if you like, though. I suppose if you really pushed your motor hard all the time, one might be beneficial. The old Ironheads ran hotter and benefitted more from an oil cooler.
 
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