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If you want to run a short rod in a trx just buy the 85/86 atc250r crank,wich is still very available new,and its the same as the 86 250r crank. I personally would run the atc cylinders,they have a more aggressive port design than the 86 trx cylinder.

I have ran atc cylinders,86 trx cylinders,and 87-89 long rod cranks w/cylinders. The hardest running setup i ever ran was a ported 86 short rod 250r. It was probably more due to the port job quality than the rod length though.
 
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