S&S Cycle Conversion Kits — 1986-2019 Harley-Davidson Sportster Models

S&S Cycle 1200cc conversion piston kit transforms any 883cc Harley-Davidson Sportster into a 1200cc without machine work, cylinder head modification, or flywheel rebalancing. The dished piston design maintains a streetable 9.4:1 compression ratio with stock 883cc heads and installs like a standard top-end job.

Features

• No machining required
• No flywheel rebalancing needed — pistons match stock 883cc weight
• No cylinder head modification required
• Dished piston design keeps compression to 9.4:1 with stock heads
• Drop-in installation time

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0687
• Category: Engine Components / Piston Sets - Powersports
• Weight: 22.4 lb

Fitment

Fits 1986-2019 Harley-Davidson Sportster models with 883cc engines.

Frequently Asked Questions

Do I need to have my cylinders bored or honed?

No — S&S designed these pistons to work in stock 883cc cylinders with zero machine work.

Will I need to rebalance my stock flywheels?

No. These pistons weigh the same as stock 883cc pistons, so your flywheel balance is unaffected.

Do stock 883 cylinder heads work with this kit?

Yes. The dished piston dome keeps compression at a streetable 9.4:1 with stock 883 heads — no head work needed.

How difficult is installation?

Installation is straightforward and takes the same time as a standard top-end replacement.

What compression ratio will I get?

9.4:1 with stock 883cc cylinder heads. This is street-legal and doesn't require premium fuel or engine tuning.