2-stroke: Vespa / Lambretta ignition adjustment with digital degree disk

The BUZZWANGLE tool is designed to easily determine both the ignition timing and the control angles of a 2-stroke engine (e.g. Vespa / Lambretta). The device measures in a 360° range with a resolution of 0.1 degrees. That's ten times more accurate than using a conventional protractor!

The kit includes a screw adapter for the most common flywheel threads:

• "L" M27x1.25 - fits LAMBRETTA Innocenti (LI, LIS, SX, TV, DL, GP, J, Lui, A, B, C, LC, D, LD) and MZ vehicles
• "V" M28x1.0 - fits almost all Vespa Largeframe and Smallframe engines with flywheel threads, Piaggio/Gilera 125-180ccm Maxi engines, and SIP Vape ignitions
• "VT" M27x1.0 - fits Vespatronic retrofitted ignitions and many classic 2-stroke motorcycles (Yamaha RZ350, RD350, RD250, BANSHEE, GAS GAS, Honda with Kokusan ignition)
• "P" M24x1.0 - fits Parmakit retrofitted ignitions, Aprilia RS125, and 50ccm engines from Kymco, MBK, Peugeot, Honda, Yamaha/MBK (Minarelli)

Determine Top Dead Center

Screw the piston stopper into the spark plug thread and rotate the piston with the flywheel until it reaches the stop. Turn the adjustment screw until the piston meets resistance. Place the BUZZWANGLE on the adapter, set to "0". Rotate the flywheel in the opposite direction, reaching the stop again. Halve the displayed value and rotate the flywheel back to the halved value: This is the exact top dead center!

Set Ignition Timing Markings

After determining the top dead center, place markings on the flywheel and engine case. Set the BUZZWANGLE to "0", rotate the flywheel, and display the desired degree before TDC. Transfer the final marking to the engine case and check with a strobe light.

Determine Control Angle

Place the BUZZWANGLE on the adapter, block the port with a thin feeler gauge blade, and set the tool to "0". Rotate the crankshaft until the piston hits the stop again. The displayed value is the exact control angle (minus the thickness of the feeler gauge blade).