HPI Racing .25 3.5 25 Nitro Engine w/ Carb (No Cooling Head) - Turns Free

HPI Racing Nitro Star F4.6 Engine - Low Compression/Gummy? As Is

Stuck Piston / For Parts: HPI Racing .21 3.5 Nitro Star Engine Used

Rare Vintage HPI Racing .25 3.5 Nitro Engine w/ Ugpraded GO Cooling Head

HPI Racing .21 3.5 Nitro Star Engine. Working

Vintage HPI Racing Savage Nitro Star Big Block F4.1? F4.6? Nitro Engine Used

HPI Racing Nitro Star F4.6 Engine Block for Parts (No head or piston)

Hyper 21 .21 Nitro Engine w/ Pull-Start - Good Pop - One way bearing slips