I've had zero boiling on my 300 riding in tropical conditions using full rad guards that are often half packed with mud, running jetting on the leaner side of things.
Last test when I was running the 250 top end up a new ST it was all first gear and the needle was a half a clip lean which had the bike making less than ideal power. We were lucky to get past walking pace and there was lots of clutch abuse to keep the forward momentum happening. The other rider has not seen his WR450 boil like that in the 10,000kms he's owned it. The gg didn't lose a drop. If I had one of these coolers I'd use it. Not sure if I'd buy them though as it doesn't seem that they need it.
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