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I had a similar problem with my 19 getting coolant into the engine oil. Ended up being the head gasket. I also bought a brand new 20 CRF450R and it blew up at 1.8hrs, was trying to figure out how I lost coolant in 15 min because it was full when my moto started and after ripping apart the engine found the one head bolt had not been torqued maybe had 5-10ft/lbs? Not saying that is your issue because of the fuel smell but if your losing some coolant and it’s causing a milky oil it could be the head...

Sounds like a blown head gasket and a leaking injector. Thats the only way gas or coolant gets into your oil.

Maybe do a leakdown test? That would help point you in the right direction. It would give you actual numbers/proof to make the dealer do something about it. Also those tusk rad caps are junk. I was losing coolant on my 19 250 on cool 65°F days. Switched back to the stock 1.1 cap and my problems on losing coolant went away. Tusk caps have a poor seal and will lose coolant without getting hot.

I don't think a blown head gasket would cause fuel delusion in the crankcase. Most of the time it's caused by a leaky injector and that can cause overheating. There where a lot of reports of the honda 250 and 450 overheating but I never noticed a rash of them at the track. I suppose the head gasket could have been buggered from the factory. Good luck getting honda to fix it if they can't see blood. I guess you need to go to another dealer and tell them it won't stop pushing coolant, should be pretty easy to prove...

Put fully synthetic in her this time around. After idle pulled the dip stick, a lot less “gas odor”. Not sure if this does the trick, or possibly just not broke in real well. Spit balling at the moment. I’m not a blazer on the track by any means. Will give it a couple more rides then check again. Have it leave for work travel, will drop it off at dealers ship to get the full grease down, service look over. Will let you guys know what comes out of it if anything at all.