that would be legal in M/PG 650/4 at either ECTA or LTA.DrillDawg wrote: ↑Fri Jul 20, 2018 4:15 pm Now if I was going to build a 650 tri. 1mile bike....I would use a late 60's main frame and a 65 rear section, the front end and swing arm assembly from mid 70's RD 250\350, 750 cases with blueprinted 5 speed, early 60's crank with small flywheel, 750 rods, 750 barrels sleeved to 650 bore, New bronze lifter blocks, std. Lifters, steel tube pushrods, modern custom pistons and ring package, early 750 head with the spread intakes, lighten rocker arms with offset buttons for more lift, polished and coated inter crankcases, polished and coated flywheel and crank, 30mm square body amals, belt drive and dry clutch, 750 lighten and coated cam gears, sludge trap removed with external oil filter, morgo oil pump, wheels laced with narrow 18" aluminum rims with skinny ribbed tires aired up to 45 psi, none o-ring 520 chain, magnetic pickup with aftermarket hei module, jap 4 cyl coil, single plug head, cam and head setup for 8500 rpm, bike geared to match, 1-3\4" two into one exhaust system with straight collector, rear drum and front disc setup not to rub while under power, ceramic non sealed wheel bearings with synthetic light grease, 16 volt battery, Champion style fiberglass gas tank, hire the smallest lightest flattracker I could find and do some dyno and track testing at whatever elevation the meet was going to be at. Then buy the rule book, lol.
8500 rpm might be problematic with a stock crank, though.