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Coolant under bike on a hot day


RobF

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This past summer I replaced the coolant in my 2005 VFR. I think I used premixed Engine Ice, FWIW. When I did the flush/replace, I ran the engine for awhile as a "burping" exercise and then topped off the coolant per the raised "upper" guideline on the reservoir. Several months later, on a hot August day, I rode the bike for several hours until I reached my hotel. After checking in, I noticed a puddle under the bike. I couldn't find any drip-drip evidence of a leak and assumed the non-oily, watery liquid was coolant that had been blown out of the radiator breather tube. To my credit, I think this was an accurate read of the situation. To my shame, I totally forgot about the incident until last night when I pulled the left side panel (lower cowl) for an unrelated project and noticed that my coolant level was low. (Oops)

 

My questions to the hive mind are:

 

     1. Why did the VFR expel coolant at the end of a long ride on a hot day?

     2. Is this a symptom of something unwell in my cooling system that requires my attention?

 

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suggest you try replacing radiator cap as it may not be holding pressure. fill overflow bottle to LOW mark only to leave space for coolant expansion.

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