Original sentence: Each track is driven at the front and passes over six unevenly spaced rubber tired road wheels, which resemble the ones used on the PT-76 amphibious light tank.Early production models (Ob'yekt 765Sp1) could maintain their top road speed only for relatively short periods because of the significant vibration level of the engine at full speed and the possibility of transmission failure, although those problems were solved to some degree on later models.It is also recommended that raising the front mudguards before crossing deep mud or loose ground will prevent the accumulation of mud above the top run.The 300 horsepower (224 kW) UTD-20 six cylinder four stroke V-shaped fuel-injected water-cooled diesel engine sits along with the transmission and engine cooling system, in a heat and sound-proof compartment on the right of the hull at the front, next to the ammunition storage area around the turret.The BMP-1 is amphibious, propelling itself in the water using hydrodynamic fairings on the track upper side covers to assist the tracks in propelling it.The fact that the vehicle has a single engine-transmission unit makes it easier to replace.The first and last road wheels have a telescopic hydraulic shock absorber.The mudguards are pivot-hinged in order to simplify maintenance of the chassis.The steel track itself is a double-pin small-link type with rubber-metal joints.The track is  long when new,  wide and has 84 links.The transmission consists of a main multi-plate metal friction clutch, two planetary double-reduction steering gears and two planetary single-reduction final drive groups.There is a special snow/mud remover in front of each idler wheel.There is an idler wheel at the rear, a front drive sprocket with detachable sprocket rings (lantern-wheel gear) and three rubber tired aluminum return rollers.They are suspended on independent torsion bars
Edited sentence: Drive sprockets are at the front with six road wheels, using torsion bar suspension.The 300 horsepower (224 kW) UTD-20 six cylinder four stroke diesel engine is located, along with the transmission, on the right of the hull at the front.The BMP-1 is amphibious, propelling itself in the water using its tracks, assisted by hydrodynamic fairings on the track upper side covers