This is HPI's Nitro Star S-25 Engine With Pullstart. This is the standard engine for the Savage 25 and the Savage SS monster trucks.
This is the HPI Nitro Star F4.1 Engine with Pull Start used in the Savage X.
This is the HPI Nitro Star G3.0 Engine with Pull Starter used in the HPI Fire Storm -
This is HPI's Nitro Star F4.6 .28 size Engine With Pullstarter. Can be installed in the HPI Savage X 4.6 Monster Truck, for those who prefer an engine with a pull starter.
This is HPI's Nitro Star K4.6 .28 size Engine With Pullstart. This is the standard engine for the Savage SS .28 monster truck kit.
This is the HPI K4.6 High Output Pull Start Engine for the HPI Hellfire
This is the HPI Fuelie 23cc Two Cycle Gasoline Engine used in the Baja 5B Buggy,
This is the Nitro Star .21 engine w/pullstart from HPI. It features full ball bearings and comes w/pre-installed engine mount for use with the HPI Savage truck. This is the stock engine for the HPI Savage.