Description
Revamp your JS550 with HSI 44mm SBN Carb Setup – complete upgrade from finicky round-body Mikuni carbs. HSI-built and jetted for piston-port 550cc engines, with choice of PJS manifold or spacer plate. Requires barrel-end throttle cable.
BN to SBN Conversion
- Intake Options: PJS manifold (best flow) or spacer plate with OEM
- HSI Prep: Primer fittings, tee-handle adjusters, custom jetting
- Complete Kit: Billet drum, ProK filter, all gaskets, fuel filter
- Throttle Cable: Must have barrel end
Model Guide
- 1982-1985 (38mm BN): PJS manifold required
- 1986-1990 (44mm BN): PJS or spacer plate
Applications
- Stock to Modded JS550: Piston-port engines
- Lead Time: 10-14 business days (Summer 2025)
Add primer kit if needed. Provide elevation and exhaust specs.
Part Numbers: Multiple – see description
