The DuroMax XP18HPE is the top of the line powerhouse engine available from DuroMax. It features a 440cc - 4 Stroke Overhead Valve design Engine that has an Electric Start as well as an E-Z Pull Recoil Start. It can cranks out 18HP capable of 26.26-Ft/Lbs of Torque. The Shaft is 1" in diameter and 2" long, while the end is 3/8" Size 24 UNF - Drilled and Tapped. Feeding this monster engine is a 1.7 gallon Fuel Tank which at half load can run over 3 hours on a single tank of fuel. The operating Fuel is standard 87 Octane or better Gasoline. It is also EPA approved for safe use in mandated areas. This Engine can handle everything you can throw at it, whether being used for log splitters, water transfer pumps, or custom go-karts, the DuroMax line of engines will deliver power when you need it. Features 4 Stroke OHV engine. Large 1.7 Gallon Fuel Tank. Runs on Standard 87 Octane Gasoline Start System: Electric Starter. Alternative Start System: Recoil Starter. Air Cleaner: Dual, Semi-dry, Oil Bath. Engine May have slight alternate cosmetic styling EPA Approved for Safe Mandated Use Applications: Go Karts, Pressure Washers, Trailer Mounted - Mobile Carwashes, Log Splitters, RotoTillers - Cultivators, Water/Trash Transfer Pump. What's in The Box DuroMax 18hp Electric Start Engine Owner's Manual Warranty 1-Year Limited Factory Warranty 30 Day Satisfaction Guaranteed Specifications Displacement: 440cc Bore: 92, Stroke: 66. Max Output: 18.0 HP / 3600 RPM. Max Torque: 26.26 ft/lb. Shaft Size: 1" Diameter, 2-3/4" Long, 1/4" Keyway Shaft End: 3/8" Size 24 UNF - Drilled and Tapped Measurement from Center of Shaft to Base: 5" Dimensions Of Unit: 16.4L x 17.9W x17.4H Fuel Tank Capacity: 1.7 Gallons Average Run Time: 1/2 Gallon Per Hour (at 1/2 load) Dry Weight: 77 lbs Recommended Fuel Type: Gasoline - 87 Octane Rating Or Better WHY FACTORY AUTHORIZED OUTLET? SECURE & HASSLE FREE SHOPPING All items are covered by manufacturer warranty. FAST SHIPPING Most Orders Delivered in 1-3 Business Days. CUSTOMER SERVICE Call us toll free: 1-800-629-3325 SATISFACTION GUARANTEED All our sales are backed by a 30-Day Satisfaction Guarantee. FREE SHIPPING ON ALL ORDERS OF $99 OR MORE Shipping Warranty Feedback About Us Factory Authorized Outlet. All rights reserved. Products shown as available are normally stocked but inventory levels cannot be guaranteed.