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Thanks for this! I want to try my first coolant replacement - any chance you have a video on the full job? Also, the one thing I'm trying to figure out is how much new coolant I need for the replacement. Thoughts?
 

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Michigan16, you should find all refill quantities in your owner's manual. If you don't have one, you can download a free PDF from Honda Motorsport's website. Just fill in the model and year and download.
Owners Manuals - Honda
 

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I use Evans Waterless Coolant in my CBR300. Used it previously in my Deauville (NT650) and it is a fit and forget job. (Except for checking the level occassionally). You have to flush the system with the preparation solution to remove all traces of water then fill with the coolant. Much more efficient cooling and it has a higher boiling point. It doesn't need replacing every so often as does standard coolant.
Evans Waterless engine coolants | United Kingdom for anyone interested in info.
 

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Thanks airhead83, just required ctrl+F'ing through my manual! Does anyone know what size sealing washer I need for the coolant drain bolt? Or have the part number? This has been hard to narrow down, too.
 

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Thanks airhead83, just required ctrl+F'ing through my manual! Does anyone know what size sealing washer I need for the coolant drain bolt? Or have the part number? This has been hard to narrow down, too.
The schematic below shows the parts, and OEM part numbers. Part #s 20 and 24 should be what you're asking for. But verify before ordering. All reputable vendors will use the same OEM part numbers. You probably don't need, and I'd be comfortable using the old one. But, it's a cheap replacement either way.
Save up to 25% on 2016 Honda CB300F OEM Parts | MotoSport
If you wanted to wait until you drain the fluid, and have bolt in hand.. I'd be willing to bet any automotive store like NAPA, Advance, O'Reilly.. (Possibly even a hardware store) would have a proper gasket to match the bolt.
 

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You are right! I had to go to my dealer and point at the bolt on my bike for them to hand me the washer. It's #24 as you said. That schematic is a great resource. Thanks very much for pointing me toward it - I'm sure I can use that for the future.
 

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How do folks feel about the necessity of flushing the cooling system with distilled water before adding the new coolant? I've seen folks do this in videos, but my service manual did not say to flush it, so I didn't do it. It did say to rinse out the reserve tank, but I decided not to do that either... Could the bit of old coolant residue really be much of an issue? I went 4 years with the OEM coolant in there before changing (vs. the recommended 2 years). The hot engine indicator never came on, but figured I should finally get around to it so swapped it out yesterday.
 
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