My son ran his s72 with the Jp1 this summer, it was awesome. People were always asking what we were running, it just screamed. He did win alot also) We also used a 7mm carb insert, we did get 8.5 minutes out of a tank when we checked once.
Rw modding and engine repair http://www.rw-mods.com
Sleeve resizing $15.00/ motor rebuild $30.00
Argus engine distributor/Avid bearings/ Alpha engines/
Fx Royal engines/ Maxy Engines
e-mail firstname.lastname@example.org Rex Welch