TUSK Crankcase Splitter Tool for Vertically Split 2‑Stroke & 4‑Stroke Engines — Adjustable Arms, 6mm/8mm Bolts

The Tusk crankcase splitter is a heavy-duty, adjustable tool designed to safely separate vertically split 2‑stroke and 4‑stroke crankcases and to press the crank assembly free without damage.

When you need to open a bottom‑end for inspection, bearing replacement, or a full rebuild, the right splitter saves time and prevents costly damage to mating surfaces. The Tusk tool features adjustable arms that adapt to many bolt patterns and ships with both 6mm and 8mm mounting bolts, making it a practical choice for a wide range of motorcycle, ATV, and small engine projects.

How does this tool make crankcase separation safer?

The Tusk splitter applies consistent, controlled force across the case joint so you avoid prying or hammering on delicate mating surfaces. That steady pressure reduces the chance of distorting cases, damaging dowels, or misaligning bearing seats during disassembly.

• Adjustable arms distribute load evenly across multiple mounting points
• Includes 6mm and 8mm bolts to match common case fasteners
• Push‑style operation removes the crank assembly without hammer strikes

Will it fit different engine makes and bolt patterns?

Yes — the arms are built to be repositioned so you can line up with many common vertically split crankcase bolt patterns. While it doesn’t cover every conceivable engine, its adjustability makes it compatible with a broad selection of dirt bikes, ATVs, and small marine or utility engines.

• Sliding, repositionable arm plates for varied bolt spacing
• Supplied bolts for two common thread sizes (6mm and 8mm)
• Compact profile works on crowded flange areas where space is limited

How does the splitter push the crank assembly out of the case?

The tool uses a central forcing screw to apply axial pressure directly to the crank or input shaft, driving the assembly out of one half of the case in a straight line. This direct pushing action prevents the twisting and rocking that can chip seals or score journals when using makeshift tools.

• Central drive screw applies even axial force
• Guided contact point keeps pressure centered on the shaft or crank nose
• Eliminates need for improvised levers or repeated hammer strikes

What parts and preparations do I need before I split a case?

Before using the splitter, remove external components, fasteners, and dowels as recommended by the engine manual, and secure the engine so it cannot shift. Having the correct bolt size, a clean work area, and a gentle backing support for the case halves will make the separation smooth and safe.

• Remove external covers, clutch, stator, or gear components as required
• Use the supplied 6mm and 8mm bolts that match your case threads
• Support one case half on a flat, soft surface to avoid marring

Who is this tool for? The Tusk crankcase splitter is aimed at professional mechanics, home wrenchers, and restoration hobbyists who regularly work on vertically split engines and want to speed up bottom‑end jobs while minimizing damage risk. It’s especially useful if you perform frequent rebuilds, service older machines with seized halves, or prefer using purpose‑built tools to reduce repair time and costly mistakes. If you need a durable, adjustable splitter that covers many common bolt patterns and includes both 6mm and 8mm mounting hardware, this Tusk tool is a practical addition to your toolbox.