Classic Motorcycle Mechanics

He ain’t heavy…

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I was reading the Moto Mental Martin CBX item and you mention the weight (mass) of the CBX as being 272kg but in actual fact and according to the manual I have, it is 249kg. Is this because you are referring to the Moto Martin CBX weight or the standard Z or A model of bike? Of course, I assume this is the dry weight, which brings up an interestin­g question. Is the dry weight the weight of a bike with all fluids but no petrol and in the case of a GT750 kettle or RD350LC or a CX500 etc, including the water for the cooling. And by

all fluids I mean brake fluids, engine oil (min or max level?), fork oil and a dry-drive chain with no oil on it? I take it this also includes the battery for the bike too. So many questions, but it is probably worth clarifying if each manufactur­er specifies a dry weight bike as the same thing for us sceptics.

Chris Green

Bertie says: “Doing some digging I’ve seen the weight range from 247kg to 272kg for the CBX. I can only think that it varies between dry weights (often quoted by the manufactur­er without fluids) and wet weights with a full tank of fuel on top. Facts and figures like this have long been ‘cobblers’, whether it’s claimed power or weight. Think about it: 18 litres of fuel adds 14kg, four litres of oil is 3kg, three litres of coolant another 3kg and then add in brake fluid and battery. I once weighed a 1999 Aprilia RSV Mille and found that despite a 183kg dry weight, with a full 18-litre tank and the bike ready to ride, it was 225kg.” cmm

 ??  ?? Make it heavy: add liquid!
Make it heavy: add liquid!

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