Wilson Performance

The engine WP started with still dominates the majority of our business.  Even with the great success of the winning Banshee engines the RZ still has a huge following.  It is my hope to provide you with the best engine and performance you’re looking for.  Have a look at the following Blueprint rebuild and Phases of performance tuning to see what tips your fancy.  With each Phase there is added gain in performance.  Phase III and IV are the top of the line.  With proper tuning on a dyno and with EGT/head temp gauges these Phases of tune will yield near 120 RWHP with the larger carbs and a good set of pipes.

Since our inception WP has developed several port specs to suit a wide variety of riding styles and particular uses for the bike.  Whether you are out blasting with the new modern bikes on the street or track daying we can provide the edge your looking for.

Machining:  Boring, honing and crank truing and welding costs are NOT included in the following Phase upgrades unless noted.

Blueprint

• Basic blueprint of the stock motor. What Yamaha should have done.
• Upper cylinder intakes
• All ports
• Tunnels
• Gasket match cylinders to top case
• Reed cages
• Set proper squish clearance

Phase I

• Upper cylinder intakes cleanup
• Port Specs to suit
• Minimum required port spec to tunnel porting
• Gasket match cylinders to top case
• Match and polish exhaust port to exhaust pipe manifold
• Deck cylinders / mill heads and re-cut squish band for higher compression and proper squish clearance
• True and weld cranks (extra)
• Uses: Wiseco pistons NO piston modifications, stock blueprinted stock reed cages with TDR reeds or other client preferred reeds. Stock intake boots.

Phase II

• Enlarge upper cylinder intakes cleanup
• Port Specs to suit
• Full tunnel cleanup
• Gasket match cylinders to top case
• Match and polish exhaust port to exhaust pipe manifold
• Deck cylinders / mill heads and re-cut squish band for higher compression and proper squish clearance
• True and weld cranks
• Uses: Wiseco pistons NO piston modifications (additional modifications available upon request, extra), blueprinted stock reed cages with TDR or client preferred reeds. Stock intake boots.
• Recommended 28-32mm carburetors

Phase III

• Gasket match cylinders to top case cleanup and polish
• WP upper cylinder intake modifications cleanup and polish

• Port Specs to suit
• Full tunnel porting and polish
• Match and polish exhaust port to exhaust pipe manifold
• Deck cylinder / mill heads and re-cut squish band for higher compression and proper squish clearance
• WP modified stock reed cages
• True and weld cranks
• Uses: Wiseco pistons with base WP piston modifications (additional modification available upon request, extra), TDR or client preferred reeds and WP modified intake boots.
• Recommend 32-34mm carburetors

Phase IV (The Torque Spec Motor)

• WP upper cylinder intake modifications cleanup and polish
• WP Phase IV Port Specs ONLY
• Full tunnel porting and polish
• Gasket match upper cylinders to top case cleanup and polish
• YPVS valve modification
• Match and polish exhaust port to exhaust pipe manifold
• Deck cylinders / mill heads and re-cut squish band for high compression and proper squish clearance
• True and weld cranks
• Uses: Wiseco pistons with WP full piston modifications, WP modified stock reed cages, TDR or client preferred reeds. WP modified intake boots
• Recommend 32-34mm carburetors

All engines will have the Balancer Modification at no additional cost.

Since our inception WP has recommended to our clients that they look at their engine as a restoration not simply a rebuild. 

These old machines are over 25-year old now.  Who knows how long they may have been sitting, what types of oils or fuels may have been run through them.  The last thing anyone wants is to get down the road and have a 10-dollar seal or gasket fail causing hundred if not thousands of dollars of damage.  Our philosophy has always been to look at it as a complete restoration.  Once finished the engine is ready for another 20+ years of service with no worries about seals and o-rings failing along the way.

WP prefers that you not dismantle your engine prior to sending it for two reasons; 1) there are far too many parts that can be mishandled in transit and lost no matter how careful one tried to be. 2) I will be able to evaluate the engine as it is being torn down to ascertain the need to replace worn or damaged screws, fittings, brackets and components.  WP can provide a crate to UPS ship your engine safely to our Shop.

WP will perform advisory services and port just your cylinders or machine just the heads as your request.  However, unless you have the capability and know how to dismantle, repair and prep the engine once finished I don’t recommend you make the 500 your first attempt at DIY.

Once you have decided what you would like performed WP would like to visit with you in depth to discuss those goals and assure you of the commitment we together are making.  At that point WP will provide a quote via email in an Excel spreadsheet outlining all the parts and machining included to build your engine.

Once the engine has arrived WP will dismantle, clean and inspect it to determine the state it is in.  WP will then report back to the client with a detail of the condition and any recommendations needed to make it a successful project.  Depending on the condition this may include additional parts and or machining, it is not known till it’s cracked open and inspected.

I look forward to helping you attain the performance goals you have.  Let me know if there is anything you don’t quite follow or would like further explanation on.