Use this handy convenient piston stopper to lock any Petrol engines piston in place for safe and easy flywheel or clutch removal. Make your work go faster with simply remove the spark plug from the engine, screw the Piston Stopper in place, and your piston and crankshaft will be locked into position.

Made from high quality aluminium this piston stopper features a knurled grip for quick finger tightening.  also included is an adapter for cylinders that has a larger M14 spark plug thread. Stopper has a M10 (NGK CM6 and NGK CMR7H Size).

This stopper is interchangeable with HPI-Z966.

Piston stopper tool for engines with 10mm threads. Works on Zenoah G230RC / G260RC / G260PU / G260PUH / G231PUH / G231PUM / G260PUM / GZ25N14 / GZ25N23 engines. Also works on Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 / GP420 / GP460 engines.

Also may fit some pocketbike engines if high-performance headkit with 10mm spark plug is installed.

fits engines with 10mm spark plug hole threads (for example, engines which use NGK "C" class spark plugs like the CMR7H, CR8HIX, etc). also 14mm spark plug threads.