Hi dave i have had the centre of the rotar become de bonded but this took over a year to do and i have had a 7.5t slow through the race and de solder everything in the can due to heat build up. i know how fast your motor is. usually sidways on the straight when im coming round. Your motor is over geared for jarrow so go down 2 teeth this will help allot and if you can turn the top end down to 80-85% as this is what i usually do and the motor doesnt over heat hope this helps dave.
cheers
james chappell
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