SP125 Limited

22 Walker Wood,  Baildon,  Shipley,  West Yorkshire,  BD17 5BE,  England

Telephone 01274 583231      steve@sp125racing.com      Mobile 07738 626165
 
www.sp125racing.com
 
RS125 NEW ACCESSORIES, TUNING & PATTERN PARTS
 
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  REED SPLITTER
 
  1995~2008 RS125 Reed Splitter - Fits Standard & Jha Reed Valve Assy £125.00 + VAT
  Slots straight into the reed valve and the Reeds then work independently of each other and reduces reed valve turbulence.
  Dyno test have shown a gains throughout the power range, especially over-rev.
  It is necessary to cut the rubber 'ears' off from the carb rubber.
 
       
 
       

Available for Honda RS125 & RS250 plus Yamaha TZ 250
 
 

  VHM ADJUSTABLE POWERJET FLOAT BOWL
 
  The VHM PowerJet Carburettor Float Bowl has been designed with an adjustable PowerJet needle. £255.00 + VAT
  The PowerJet can be adjusted from approximately #0 up to #80  PowerJet sizes by simply adjusting the external screw.
  1 turn of needle is equal to #40 PowerJet and 1 ¼ turns is equal to #45 PowerJet.
  No need to remove the float bowl to make adjustments or change the PowerJets.
 
  The standard PowerJet is not central in the carb float bowl.
  Because of this, through long fast corners the standard PowerJet can draw air when the bike is leaned over and at fully open throttle,
  as the standard PowerJet becomes higher than the fuel level in the standard float bowl.
  This can cause detonation, as the PowerJet draws in air rather than fuel.
 
  The VHM Float Bowl takes fuel from the centre of the float bowl.
  The VHM Float Bowl has 2 channels, taking fuel from the centre of the bowl and then from the adjustable PowerJet screw needle.
  This eliminates the possibility of the PowerJet drawing in air and eliminates detonation caused in long corners with the standard PowerJet system.
 

          

 
 

  VHM A-KIT 'DOMED TOP' PISTONS & 0.8mm PISTON RINGS
 
  New VHM A-Kit Domed Top Piston with 0.8 mm Piston Ring £105.00 + VAT
  This piston comes complete with 1x 0.8 mm piston ring, 1x piston pin & 2x clips
 
  Designed specially for Honda RS125 and RS250 and used with standard Honda Small End Bearing 91101-NX5-023
 

 
  Please note: The VHM A-Kit 'Domed Top' piston has been designed as a direct replacement for the  discontinued HRC A-Kit 'Domed Top' Piston.
                     The piston is manufactured by Vertex.
                     There are many other different pistons manufactured by Vertex, mostly for Road or MotoX use.
                     But only the pistons having the VHM logo inside are designed and recommended for use in Honda RS125 or RS250.
                     Do not use other 0.80 mm piston ring or other piston pin or other clips with VHM pistons!
 
 
  Please note: Production of the 'domed top' HRC A-Kit Pistons has now finished
                     HRC do not plan to make any more of these 'domed top' pistons and stock is now sold out.
 
 

  VHM 'FLAT TOP' PISTONS & 0.7mm PISTON RINGS
 
  The VHM pistons have been proven on various GP bikes and with good results.
  These pistons weigh less than the standard pistons, which will improve engine over rev characteristics and give better throttle response.
  The surface of the piston has a special roughness for better oiling, which will help to prevent premature seizure and damage.
 
  New VHM flat top piston with 0.70 mm low friction piston ring £105.00 + VAT
  This piston comes complete with 1x 0.7 mm low friction piston ring + 2x clips
  Must be used with special 41mm short piston pin - sold separately.
  Designed specially for Honda RS125 and RS250 and used with standard Honda Small End Bearing 91101-NX5-023
  Piston weight 117g
 

 
  New VHM Special 41mm Piston Pin £12.00 + VAT
  Piston pin weight 28.2g

 
  New VHM Special 0.7mm low friction Piston Ring £16.50 + VAT
  Piston ring weight 2.0g
 
  New VHM Special Piston Circlip £0.50 + VAT
 
  Please note: The VHM 'Flat Top' piston has been designed as a direct replacement for the  discontinued 2005 HRC 'Flat Top' Piston.
                     The piston is manufactured by Vertex.
                     There are many other different pistons manufactured by Vertex, mostly for Road or MotoX use.
                     But only the pistons having the VHM logo inside are designed and recommended for use in Honda RS125 or RS250.
                     Do not use other 0.70 mm piston ring or other piston pin or other clips with VHM pistons!
 
 

  New 2008 HRC 'FLAT TOP' PISTONS & 0.7mm PISTON RINGS
 
  New HRC 2008 Flat Top Piston £110.00 + VAT
  New HRC 2008 0.7mm Flat Top Piston Ring £17.50 + VAT
 

 

  Please note: The 2008 HRC 'Flat Top' piston & 0.7mm Piston ring has been designed as a direct replacement for the  discontinued 2005 HRC 'Flat Top' Piston.
                     These are the same pistons as used in the HRC Factory GP125 World Championship bikes.
 
 

  COATED KIT PISTONS & RINGS  -  HRC 'Domed Top' A-Kit Pistons
 
  FACTORY TEFLON COATED A-KIT PISTON - Less Friction, Improved Wear & Stops Ring Stick   SOLD OUT SOLD OUT
  FACTORY TITANIUM NITRATE COATED A-KIT 0.8mm PISTON RING - Less Friction & Improved Wear £17.50 + VAT
 

'Domed Top' A-Kit Coated    SOLD OUT       SOLD OUT
 
  Please note: Production of these 'domed top' HRC A-Kit Pistons has now finished
                     HRC do not plan to make any more of these 'domed top' pistons and stock is now sold out.
 
 

  VHM 2 PIECE KIT CYLINDER HEADS
  VHM UNIQUE PERFORMANCE ENHANCING  STANDARD 2-PIECE CYLINDER HEAD DESIGN (Standard 5-Stud) £170.00 + VAT
 
  VHM UNIQUE PERFORMANCE ENHANCING  A-KIT 2-PIECE CYLINDER HEAD DESIGN (A-Kit 6 Stud) 2007 spec £170.00 + VAT
 

STD      A-KIT
 
 
  VHM INDIVIDUAL HEAD INSERT (11.20cc / 11.40cc / 11.60cc) £38.50 + VAT
  VHM INDIVIDUAL BLANK HEAD INSERT £27.50 + VAT
  VHM INDIVIDUAL SPECIAL MADE HEAD INSERT (All Head Volumes Available for Leaded & Unleaded Fuel) £55.00 + VAT
  VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR 'FLAT-TOP' PISTON (Available for Leaded & Unleaded Fuel) £55.00 + VAT
  VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR JHA KIT (Available for Leaded & Unleaded Fuel) £55.00 + VAT
  VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR SEEL KIT (Available for Leaded & Unleaded Fuel) £55.00 + VAT
 
 

  'FLAT-TOP' VHM INSERT
 
 

  VHM SQUISH, COMPRESSION & VOLUME MEASUREMENT TOOLS
  VHM PISTON PROJECTION / SQUISH SETTING TOOL £80.00 + VAT

   

 
 
  An absolute 'must have' to achieve accurate squish, volume and port timing - go to VHM Tool Information
 

 
  VHM PIPETTE / BURETTE (with adjuster for fine measurement) £45.00 + VAT

 
 
  VHM GP 'HEAVY' CRANKSHAFT - For Total Loss Ignition £1,250.00 + VAT
 

  VHM is now producing crankshafts for the 1995/2008 Honda RS125.
  They have done a lot of testing with different weight, balance and inertia.
  The tests show only a little difference on the dyno, but on the track the driveability feels very different.
  It can only be used with total loss (Battery) ignition. - As used by many GP Teams

Supplied with blanking plug for right side crankcase

  

 
 

      

 

 
 

 
  VHM GP 'HEAVY' CRANKSHAFT - For Standard Ignition or Total Loss Ignition £1,250.00 + VAT
   Now 3 different inertia crankshaft models available for standard ignition RS125 Honda  (24.5 + 26.5 + 27.9)
   Standard RS125 Honda Crankshaft has inertia of 24.2
 

  VHM is now producing crankshafts for the 1995/2008 Honda RS125.
They have done a lot of testing with different weight, balance and inertia, making now 3 different inertia type crankshafts.
  The tests show only a little difference on the dyno, but on the track the driveability feels very different.
  It can be used with standard A/C Generator Ignition or Total Loss (Battery) ignition. - As used by many GP Teams

  

 
 

   

 
 
  VHM GP 'HEAVY' CRANKSHAFT REBUILD SET
  Crankshaft Rebuild Kit for VHM GP 'Heavy' Crankshaft AK20005(T)  (27.9 Inertia) £115.00 + VAT
  The connecting rod kit consist of a connecting rod, Ø22x53 big end pin, needle bearing and side washers.

  27.9 Inertia  AK20005(T)