SP125 Limited  
  22 Walker Wood,  Baildon,  Shipley,  West Yorkshire,  BD17 5BE,  England  
  Telephone 01274 583231      steve@sp125racing.com      Mobile 07738 626165  
 
  www.sp125racing.com  
       
  Power-jet controller system  
     
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  Power-jet controller system  
     
  This is a great little add on for the RS125 & RS250 Honda.  
           
  Overview  
  With higher compression fuels there is a requirement to lower the power-jet cut-off rpm point.  
  This is not adjustable on the standard ignitions.  
  The Power-Jet controller system allows you to change the power-jet cut-off rpm point.  
  The unit also includes a lower throttle roll-off point to reduce engine damage on slow rolling-off the throttle.  
           
  On the RS125 PJ controller system a single 16 position switch selects the RPM point.  
  On the RS250 PJ controller system 2 separate 16 position switches control each power-jet independently.  
     
  Model A For Leaded Fuel    
  Switch Position Cut-off RPM    
  0 11,500    
  1 11,600    
  2 11,700    
  3 11,800    
  4 11,900    
  5 12,000    
  6 12,100    
  7 12,200    
  8 12,300    
  9 12,400    
  10 12,500    
  11 12,600    
  12 12,700    
  13 12,800    
  14 12,900    
  15 13,000    
     
     
  Model B For Unleaded Fuel    
  Switch Position Cut-off RPM    
  0 12,000    
  1 12,100    
  2 12,200    
  3 12,300    
  4 12,400    
  5 12,500    
  6 12,600    
  7 12,700    
  8 12,800    
  9 12,900    
  10 13,000    
  11 13,100    
  12 13,200    
  13 13,300    
  14 13,400    
  15 13,500    
     
  Operation  
     
  . The power-jet un-powered is adding fuel, on powering the power-jet this shuts off this fuel jet.  
     
  . Below the Low RPM level at 3000 RPM the jet is not powered to ease starting on generator.  
     
  . If the throttle is disconnected the jet is down powered to add fuel and ensure a safe fuel level.  
     
  . In normal operation as the throttle level is increased the jet opens (down powered) to add fuel,  
  on decreasing (roll-off) the power jet stops adding fuel at a lower throttle level  
  to reduce the leaning off ( and subsequent detonation if fuel permits).  
     
  . With high throttle and increasing RPM the jet will cut-off at the RPM level set by the selector switch,  
  if the RPM falls at this throttle then the jet will operate at 300RPM below the cut-off point selected,  
  this reduces the jittering if the RPM is held around the cut-of point.  
     
 
 
 
     
  Wiring  
     
  The unit connects to the Taco to obtain the power and the rpm signal, the unit also connects to the throttle signal to  
  control the throttle points, the unit then powers the power jet directly. Mount the unit in the nose of the motorcycle  
     
  Connections  
  In the nose cone, at Rev Counter or Wire Harness to Rev Counter connection:  
  Green to Rev Counter Green wire  
  Blue to Rev Counter Blue wire  
  Black to Rev Counter Black wire  
     
  In the air-box:  
  Yellow to yellow with blue at the throttle  
  Disconnect the 2 pin power-jet connection  
  Connect the black to power jet black (not connected to the loom)  
  Connect grey to power jet grey (not connected to the loom)  
     
  Connections  
  Voltage range 9V to 18V    
  Input Current 5mA nominal    
  Drive current 3A maximum    
  Temperature range -10 deg Celsius to +130 deg Celsius    
  Weight Approx 50g    
  Low RPM level 3000 RPM    
  Throttle fail below 200mV    
  Operational throttle 2.9V throttle-on 1.9V throttle-off    
  Rpm Hysteresis 300RPM    
     
           
  In Stock now        
           
  RS125 Honda  :  £200.00 + VAT  
           
  RS250 Honda  :  £240.00 + VAT  
     
     
  Exports of all parts supplied to outside EC Countries are exempt from UK VAT  
  Exports to EC Countries are exempt from VAT if a valid VAT registration number is supplied  
           
           
  CALL STEVE PATRICKSON  
  01274 583231  or  07738 626165  
  OR SEND YOUR E-MAIL TO  
  steve@sp125racing.com  
       
           
  Return To sp125racing.com Homepage  
           
           
 
 
 
           
     
  SP125 Limited Disclaimer  
           
  Honda, HRC and all other parts supplied by the SP125 Limited are not guaranteed when used in competition events.  
  As such, it is a condition of our making all parts available that it is solely the decision of each individual, rider, team member or   
  team whether they choose to use any part supplied and in doing so, absolve the manufacturer and SP125 Limited of any or all   
  such claims, including damage to equipment and/or injury to personnel irrespective of how caused.  
           
  All parts remain property of SP125 Limited until paid for in full.  
           
  All 'special order' parts, that are ordered specially under the instruction of the customer, are non returnable and non refundable.