Description
Case boring doesn’t have to be stressful — this ProBld tool lets you open up your GY6 A engine cases for larger cylinders with clean precision. Just bolt it on, chuck up a drill, and adjust to your desired bore size.
The Details
Designed specifically for GY6 A (54mm stud spacing) engine cases, this boring tool keeps the cut centered and consistent, helping you safely clear material for big-bore cylinders. Run your drill with the clutch engaged and take shallow passes to maintain control. The stainless hardware and adjustable guide arms make this a strong, reusable tool for builders who love clean work.
Important Things to Note
- For 54mm stud spacing only (GY6 A cases)
- The crankshaft must be removed before use
- Cut in small increments — do not remove too much material at once
- Requires a handheld drill with clutch
- This demonstration video is for reference only — it does NOT show the ProBld tool
What’s Included
- ProBld GY6 case boring tool assembly
- Adjustable boring guide arms
- Mounting hardware for case setup
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