Apollo, I do like my 310 kit. It definitly adds a major punch without sacrificing revs. It'll wheeie with ease throughout the gears. It has TRX9 porting, Boyesen Rad valve w/ pro series carbon fiber reeds, Keihin 38mm Air Stryker Carb, K & N Filter (no air box), Hinson clutch basket, & an FMF pipe. The only other ESR product I use is a billet exhaust flange, but I may go to an ESR pipe as I've heard good things about them.
I'll try to post a pic or two of the beast later.
Current Ride (Purchased new in Oct. 84) - 1985 Honda ATC 250R w/ ESR 310cc big bore kit
Wife's Ride - 2009 Polaris RZR 800
Kid's Rides - 2009 Yamaha Raptor 700, 2008 Yamaha Raptor 250
Former Rides - 1975 Honda XR 75, 1979 Yamaha IT 175, 1978 Honda ATC 90, 1980 Honda ATC 110
got sand?