49mm Hyway cylinder piston kit for Stihl MS311 and MS391. Replaces OEM number 1140 020 1204.

Only fits the MS311 and MS391 models that have the 3 bolt intake manifold. There was a less common 4 bolt version that this kit does not fit without replacing the manifold. 

Standard bore for MS391 and big bore for MS311.

These Taiwan cylinder kits are good quality and the plating is thicker than the ones out of China.

90 day guarantee.

Free shipping and Free returns if you aren't happy with the kit.