Nwp Worm Gear 064 066 Ms 640 650 660 (10 Pack)
QX 11226 407105
NWP worm gears are an economical replacement option for your Stihl chainsaws. Worm gears (also known as pinion gears) are one of those wear items that get little attention until they quit working. Like all moving parts, they will eventually give out with prolonged use and need to be replaced, especially when running low quality bar oil or used motor oil. We recommend having a couple of spares around.