cheers for the replies guys.
Chris, when you say sintered is cooler is that the motor or the speedo as well? No one seems to clarify that.
i currently have a 25mm fan in the lazer for the old motor, hence the idea of pointing it at the speedo instead!
i'll see if i can shoehorn the fan into the B4. I'm sure it will be ok now, but come 30 deg heat in July the fan may be needed.
I agree the 4.5 may be a tad overkill on some tracks but the price was too good. i may get a 5.5 motor to use as well, and save the 4.5 for really fast tracks!
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