Question about 1997 Honda CBR 900 RR Fireblade

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When is the fan ment to kick in because i just went out on it it a hot day and was out for about an hour and the fan didnt kick in please help

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The fan is thermostatically controlled and the coolant temperature needs to reach the upper level before it will "kick in". Surprisingly as long as the motorcycle is moving forward specially on a fairing type motorcycle the head is dispersed rapidly by the air moving over the radiator fins.
If you were in stop and go traffic with extended idle times then yes the fan will or should kick in.

Both my Goldwings had temperature gauges and were full fairing motorcycles sitting in rush hour traffic I could watch the gauge climb at a traffic light and steadily drop off even at 25mph.

What you may be feeling is the heat rolling out from under the fairing to the rear of the engine which on a hot day and low speeds is enough to feel as if both you and the motorcycle are overheating.

What I've done with my 750 Magna is roll into my drive (on a hot day after being in traffic) leave the ignition on and hit the kill switch, maybe a minute later the fan will kick in for about 40 seconds and shuts off. Just my way of checking.

Another thing on the Fireblade you might not hear the fan over the "normal" engine sound these fans are quiet and that's one reason I did the kill switch shut off so I could hear the fan.

Also the coolant used in a motorcycle is much more efficient then any automotive type and should never be substituted for any automotive type.

Cheers be safe and enjoy your motorcycle

Posted on Apr 10, 2011

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