Namura .020 Over Bore Piston Rings for Yamaha 660 Raptor Grizzly & Rhino 100.5mm
Namura .020 Over Bore Piston Rings for Yamaha 660 Raptor Grizzly & Rhino 100.5mm
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Piston Rings for Yamaha
These .020 over bore piston rings, sized at 100.5mm, are designed for Yamaha 660 Raptor, Grizzly, and Rhino engines, providing a precise seal for rebuilt cylinders.
Overview
Namara brand piston rings for Yamaha 660 Raptor, Grizzly, and Rhino models offer a .020 oversize (100.5mm) fit for bored cylinders, restoring compression and oil control during engine rebuilds. Each set includes top and second rings for reliable sealing in high-performance Yamaha engines.
Built For Performance
- Ductile iron construction for low friction and long wear
- Chrome-plated top ring resists scuffing under load
- Taper-faced second ring for rapid oil scraping
- Precisely gapped for consistent ring pressure
- Compatible with standard ring grooves
Fits These Machines
- for Yamaha Raptor 660 (2001-2005)
- for Yamaha Grizzly 660 (2001-2008)
- for Yamaha Rhino 660 (2003-2009)
On-The-Job Use
- Top-end rebuilds after cylinder boring
- Restoring compression in high-mileage Yamaha ATVs
- Performance upgrades paired with aftermarket pistons
Specs At A Glance
| Size | 100.5mm (.020 oversize) | <
| Ring Type | Top and second rings |
| Material | Ductile iron with chrome plating |
| Application | Yamaha 660 engines (Raptor, Grizzly, Rhino) |
Good To Know
Q: Do these rings require a specific ring gap? A: Yes, measure and adjust ring end gap according to your cylinder bore dimensions for proper sealing.
Q: Can these rings be used with a standard bore piston? A: These are .020 oversize rings and require a cylinder bored to 100.5mm; they are not for stock bore pistons.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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