Q Why is my Tracer blow­ing hot and cold?

Motorcycle News (UK) - - Garage -

The coolant tem­per­a­ture of my Yamaha MT-09 Tracer seems to vary a lot. It gen­er­ally runs at 70 de­grees, up to 105 de­grees in traf­fic be­fore the fan cuts in, but got down to a sur­pris­ing 55 de­grees at 70mph on the mo­tor­way in some re­cent rain. Is this OK? Launce Mor­gan, email


An­swered by Chris Dabbs, MCN The is­sue with any en­gine is over­heat­ing, and as long as your fan is cut­ting in when the tem­per­a­ture climbs there is no prob­lem. Even though most bikes are liq­uid-cooled, they aren’t like cars with a mas­sive ra­di­a­tor to dis­si­pate heat, and need air­flow to keep them in the sweet spot. The same bike is also sold in mar­kets with a much hot­ter climate than the UK, so bikes can run cooler here. Yamaha’s Su­per Ténérés and the first TDMS were quite ‘cold-blooded’ and you were lucky to see 70 de­grees in the UK. I’m sur­prised that the tem­per­a­ture got as low as 55 on the mo­tor­way, but that could have been be­cause you checked it just as the ther­mo­stat opened and the tem­per­a­ture dropped tem­po­rar­ily as colder coolant flowed past the sen­sor.

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