JSN964 Engine – Big Bore Stock Stroke Performance

We do our best to keep JSN964s in stock.  Contact us to check on lead times!

JSN Engines are built to order.  There is a 90 day lead time for all JSN engine orders though delivery times are typically faster. 

Looking for the best bang-for-the-buck performance for you freestyle or freeride ski? The JSN964 is the answer.  Featuring the world famous CPI cylinder, the JSN964 is the most powerful stock stroke engine in the industry.  We’ve taken the cylinder that changed the jet ski industry and paired it with an engine package thats reliable and easy to maintain.  You’ll be amazed at the power these engine makes with a stock stroke crank.

We start with new aftermarket stock replacement cases then sand blast and epoxy.  We then CNC port the cases so every build is exactly the same.  Every engine comes fully assembled and pressure checked.  You’ll have access to a full build profile with every spec down to what type of case sealant and epoxy was used on our website.  Looking to buy a used JSN engine and not sure how it was originally built?  We’ve got you covered – you can simply enter the engine serial in our engine catalog and find every detail of how that engine was originally built.

Whats Included?

• Assembled Shortblock
  • Nikasil plated CPI cylinder with JSN porting
  • JSN epoxied, CNC ported and painted new cases
  • High strength custom alloy cylinder studs
  • ARP case stud nuts (not shown in picture)
  • Blueprinted stock stroke crankshaft
  • Wiseco Pistons
  • JSN engineered head shell and domes
  • JSN power valves,
  • JSN black anodized PV guides
  • JSN black anodized PV caps (raw finish shown in picture)
  • PV boots and retainers

Optional Services

• $100 -Exhaust manifold port matching (customer ships exhaust manifold to JSN)
• $50 – Custom head shell engraving