sp125racing
Follow us at
  • sp125racing
  • Honda RS125
    • RS125 Genuine Honda HRC Parts
    • RS125 Engine Parts
    • VHM Piston Height Tool Guide
    • RS125 Chassis Parts
    • RS125 Honda Wheels Tyrewarmers Sprockets
    • RS125 Honda Crash Protectors
    • RS125 Honda Brembo Brakes
    • RS125 Honda Handlebars Levers & Footpegs
    • RS125 Honda Stands
    • RS125 Honda Quickshifters
    • Battle Shifter Fitting Instructions
    • RS125 Special Tools
    • RS125 Honda Fairings
    • RS125 Honda Seats
    • RS125 Honda Mudguards
    • HRC Datalogger & Detonation Counters
    • Detonation Detection System
    • Replacement for HRC Detonation Lead
    • RS125 16 Setting Ignition Curve Changer
    • RS125 Ignition Pulse Simulator
    • RS125 Throttle Position Sensor Checker
    • RS125 Gear Change Light
    • RS125 Powerjet Controller
    • RS125 Powervalve Controller Box
    • RS125 High Viz Temp Gauge
    • RS125 Ni-MH Battery Pack
    • RS125 Honda How To Order
  • HRC Setting Data & Maintenance Information
    • RS125R / RS250 Basic Concept of Power Jets
    • RS125 / RS250 Settings using Detonation Counters
    • RS125 / RS250 Settings according to seasonal conditions
    • RS125R / RS250R Functions of carburetor parts
    • RS250R Carburetor Settings
    • RS125R Parts Combination according to model years
    • RS250R Parts Combination according to model years
    • RS125R / RS250R Optimizing riding position
    • RS125R / RS250R Suspension Settings vol.1
    • RS250R Suspension Directionality
    • RS125R / RS250R Points of engine and frame assembly
    • RS125R / RS250R Notes on Engine Maintenance
    • RS125R / RS250R Notes on Frame Maintenance
    • RS125R / RS250R Conservation for engine power
    • RS125R / RS250R Running In / Warming Up / Position Adjustment
  • Honda RS250
    • RS250 Genuine Honda HRC Parts
    • RS250 Engine Parts
    • RS250 Chassis Parts
    • RS250 Handlebars, Levers & Footpegs
    • RS250 Brakes
    • RS250 Honda Stands
    • RS250 Honda Quickshifters
    • RS250 Bodywork
    • RS250 Bike Specification 2008
    • RS250 16 Setting Ignition Curve Changer
    • RS250 Ignition Pulse Simulator
    • RS250 Honda How To Order
  • Honda NSF250R
    • NSF250R Genuine Honda HRC Parts
    • NSF250R Engine Parts
    • NSF250R Honda Wheels Tyrewarmers Sprockets
    • NSF250R Honda Handlebars Levers & Footpegs
    • NSF250R Chassis Parts
    • NSF250R Honda Crash Protectors
    • NSF250R Honda Stands
    • NSF250R Honda Quickshifter
    • NSF250R Bodywork & Airbox Parts
    • NSF250R Honda How To Order
    • NSF250R High Viz Temp Gauge
  • Nova Gearbox - KTM Moto3
  • Terms and Conditions
  • Steve Patrickson Profile
  • Race Team Archives
    • 2023 sp125racing Team
    • 2022 sp125racing Team
    • 2021 sp125racing Team
    • 2020 sp125racing Team
    • 2019 sp125racing Team
    • 2018 sp125racing Team
    • 2017 sp125racing Team
    • 2016 sp125racing Team
    • 2015 sp125racing Team
    • 2014 sp125racing Team
    • 2013 sp125racing Team
    • 2012 sp125racing Team
    • 2011 sp125racing Team
    • 2010 sp125racing Team
    • 2009 sp125racing Team
    • 2008 sp125racing Team
    • 2007 sp125racing Team
    • 2006 sp125racing Team
    • 2005 sp125racing Team
    • 2004 sp125racing Team
    • 2003 sp125racing Team
    • 2002 sp125racing Team
    • Tom Carne Profile
    • Jordan Weaving Profile
    • Rob Guiver Profile
    • Brad Ray Profile
    • Chrissy Rouse Profile
    • Matt Davies Profile
    • Ben Barrett Profile
    • Matthew Hoyle Profile
    • Lee Costello Profile
    • Nicole McAleer Profile
    • Connor Behan Profile
    • Luke Hinton Profile
    • Jordan Malton Profile
    • Dan Moreton Profile
    • Michael Smith Profile
    • Luke Jones Profile
    • Jamie Ashby Profile
    • Mark Clayton Profile
    • Joel Marklund Profile
    • Elliot Lodge Profile
    • Elliot Lodge 2018 Profile
    • Elliot Lodge 2019 Profile
    • Harvey Claridge 2018 Profile
    • Harvey Claridge 2019 Profile
    • Franco Bourne 2019 Profile
    • Calum Beach 2019 Profile
    • Jeremy Knight 2019 Profile
    • Cameron Horsman 2019 Profile
  • Contact
  • 2022 Race Dates
  • 2023 Race Dates

HONDA RS125 NEW ENGINE ACCESSORIES, TUNING & PATTERN PARTS 2023


Please  'Refresh' this page every time you visit.         If it is slow to reload, you know then that this page has been updated since your last visit.


VHM CRANKSHAFT REBUILD KIT FOR STANDARD HONDA RS125 CRANKSHAFT

Conn-Rod rebuild kit for rebuilding the original 1995~2004 Honda RS125 Crankshaft 13300-NX4-711
Big end pin is same dimensions as Standard Honda RS125.
The connecting rod kit consists of a billet VHM connecting rod, Ø24x54.9 big end pin, high spec big end needle bearing and side washers.      £395.00 + VAT
​
VHM have developed a superior connecting rod for the Honda RS125 crankshafts.
The connecting rods are made of the best material which is CNC machined to remove all surface imperfections.
The rods are then machined to final size and has then been shot- peened and polished to achieve the ultimate in strength and durability.
Picture
Picture
Picture

TKRJ JAPANESE CRANKSHAFT REBUILD KIT FOR STANDARD HONDA RS125 CRANKSHAFT

The TKRJ Connecting Rod Kit has been developed and manufactured in Japan.
Direct replacement for rebuilding the original 1995~2004 Honda RS125 Crankshaft 13300-NX4-711
The mileage control is the same as HRC, recommend 2,000km, if it used with standard Honda RS125 engine
Also supplied with Small End Bearing       £235.00 + VAT
Picture
Picture
Picture

CLUTCH COVER GASKET

Pattern Clutch Cover Gasket - for the 1995~2004 Honda RS125.
​Replaces the Honda GASKET,R.COVER ​11394-NX4-003 which are now discontinued & sales finished by Honda.     
£15.00 + VAT each
Made from 0.5mm Elring EWP 210 German quality gasket material. 
EWP 210 is a gasket material based on aramide fibers with NBR binder.
EWP 210 combines excellent oil and fuel resistance with good stress relaxation and high tensile strength.
Picture
Picture

CYLINDER BASE GASKETS

Pattern Cylinder Gaskets - for the 1998~2004 Honda RS125.

0.5mm (Replaces the Honda GASKET,CYLINDER (0.5T) 12195-NX4-781 which are now discontinued & sales finished by Honda. 
0.70mm
0.95mm    
£7.50 + VAT each
Made from Elring EWP 210 German quality gasket material. 
EWP 210 is a gasket material based on aramide fibers with NBR binder.
EWP 210 combines excellent oil and fuel resistance with good stress relaxation and high tensile strength.
Picture
Picture

WATER PUMP COVER GASKET

Pattern Water Pump Cover Gasket - for the 1995~2004 Honda RS125.
​Replaces the Honda GASKET,WATER PUMP ​19229-NX4-003 which are now discontinued & sales finished by Honda.     
£6.25 + VAT each
Picture

REED VALVE GASKET

Pattern Reed Valve Gasket - for the 1990~2004 Honda RS125.
​Replaces the Honda GASKET,REED VALVE​ ​14132-NF4-651 which are now discontinued & sales finished by Honda.     
£5.00 + VAT each
​Made from Elring EWP 210 German quality gasket material. 
EWP 210 is a gasket material based on aramide fibers with NBR binder.
EWP 210 combines excellent oil and fuel resistance with good stress relaxation and high tensile strength.
Picture
Picture

JET HOLDER PLATE

RS125 Honda Jet Holder Plate  -  Main Jets numbered x1 from #150 to #220          £40.00 + VAT
Picture

PISTON / CONN-ROD SMALL END BEARING

Pattern Small End Bearing - Made in Japan.            £25.00 + VAT
​
The original Honda Small End Bearing, part number 12213-ND5-000, is now discontinued and not possible to buy.
This bearing is a direct replacement for the original RS125 & RS250 Honda part.
Performance and reliability is as good as the original Honda bearing.
Picture
Picture

VERTEX 'FLAT TOP' A-KIT PISTONS & 0.8mm PISTON RINGS

New Vertex Flat Top A-Kit Piston with 0.8 mm Piston Ring               £135.00 + VAT
Designed specially for Honda RS125 and Honda RS250 and used with standard Honda Small End Bearing 91101-NX5-023
This piston comes complete with 1x 0.8 mm piston ring, 1x piston pin & 2x clips  

A cheaper version flat top piston available for both Honda RS125 & Honda RS250.
We have used these pistons ourselves, with no problems, but a little more work is necessary in relieving the piston skirt edges and in setting the piston ring gap, compared to when using the VHM flat top pistons.
Overall weight is 12g more than the VHM flat piston, but it does not seem to effect performance.

Sizes available: A = 53.94mm     B = 53.95mm     C = 53.96mm
The A-Kit Flat Top Piston has the Piston Ring Gap directly at the back of the Piston, running over the rear boost port.
Can be used in standard cylinders, but the standard cylinder would require the rear boost port chamfering, so the piston ring does not 'snag' in the port.
Picture
Individual Parts Available
New Vertex 0.8mm Piston Ring                    £24.50 + VAT   
New Vertex 45mm x Ø15mm Piston Pin        £10.00 + VAT
New Vertex Piston Circlip                              £0.75 + VAT

VERTEX 'DOMED TOP' A-KIT PISTONS & 0.8mm PISTON RINGS

New Vertex A-Kit Domed Top Piston with 0.8 mm Piston Ring  
Designed specially for Honda RS125 and RS250 and used with standard Honda Small End Bearing 91101-NX5-023
This piston comes complete with 1x 0.8 mm piston ring, 1x piston pin & 2x clips      £135.00 + VAT
Picture
Sizes available: A = 53.94mm     B = 53.95mm     C = 53.96mm
The A-Kit Domed Top Piston has the Piston Ring Gap directly at the back of the Piston, running over the rear boost port.
Can be used in standard cylinders, but the standard cylinder would require the rear boost port chamfering, so the piston ring does not 'snag' in the port.

Individual Parts Available
New Vertex 0.8mm Piston Ring                    £24.50 + VAT   
New Vertex 45mm x Ø15mm Piston Pin        £10.00 + VAT
New Vertex Piston Circlip                              £0.75 + VAT

VHM SOLID BILLET DOMED TOP A-KIT PISTON  - Honda RS125 / RS250

​
Designed specially for Honda RS125 and RS250 and used with standard Ø15mm Honda Small End Bearing 91101-NX5-023
This piston comes complete with 1x 0.8 mm piston ring, 1x Ø15mm piston pin & 2x clips      

VHM Billet Domed Top A-Kit piston kit Honda RS125 /RS250        Size A1       Ø53.92        £
147.50 + VAT
VHM Billet Domed Top A-Kit piston kit Honda RS125 /RS250        Size A         Ø53.93        £
147.50 + VAT
VHM Billet Domed Top A-Kit piston kit Honda RS125 /RS250        Size B         Ø53.94        £
147.50 + VAT
VHM Billet Domed Top A-Kit piston kit Honda RS125 /RS250        Size C         Ø53.95        £
147.50 ​+ VAT
Picture
Picture

VHM SOLID BILLET FLAT TOP A-KIT PISTON  - Honda RS125 / RS250

​
Designed specially for Honda RS125 and RS250 and used with standard Ø15mm Honda Small End Bearing 91101-NX5-023
This piston comes complete with 1x 0.8 mm piston ring, 1x Ø15mm piston pin & 2x clips      

VHM Billet Flat Top A-Kit piston kit Honda RS125 /RS250        Size A         Ø53.93        £
147.50 + VAT
VHM Billet Flat Top A-Kit piston kit Honda RS125 /RS250        Size B         Ø53.94        £
147.50 ​+ VAT
Picture
Picture
Picture

1987 - 1994 NF4 Honda RS125 (Ø14 piston pin) VHM piston kit
​available for older model RS125 and RS250 Honda's using Ø14mm piston pin.

VHM Billet Domed Top A-Kit piston kit Honda RS125, RS250, piston pin Ø14       Size A       Ø53.93       £
147.50 + VAT
VHM Billet Domed Top A-Kit piston kit Honda RS125, RS250, piston pin Ø14       Size B       Ø53.94       £
147.50 + VAT
​VHM Billet Domed Top A-Kit piston kit Honda RS125, RS250, piston pin Ø14       Size C       Ø53.95       £
147.50 ​+ VAT
Picture
Picture
​​With many years of experience in research and design of 2 stroke pistons, this has led VHM in the development and manufacturing of pistons machined from a solid billet material.
This gives VHM the great possibility to change quickly to any shape. 
Other improved material properties can be tested quickly without high cost and VHM have great control over dimensional accuracy.
VHM billet pistons are 100% CNC machined from a high quality solid billet material, specially manufactured according to VHM specifications and material properties. 
The pistons feature internal and external machining to unique shapes for an increased rigidity.
The billet pistons are machined on every surface allowing for all unnecessary weight to be removed.
​It can deliver the highest uniformity of material thickness on skirts and the general body.
The piston features a special skirt shape, which will result in a cylindrical shape during operating temperature, with the optimum clearance for less friction, giving the best performances.
VHM solid billet piston kits come completely with piston, piston ring, piston pin and 2x clips.
​
Benefits:
  • Fully CNC machined
  • Precision machined ring grooves
  • Bottom oilers for pin lubrication
  • Precision machined for exact pin clearince
  • VHM special high quality billet aluminum alloy
  • Unique internal shape for increased rigidity and optimum strength in critical stress areas
  • Cylindrical shape during operating temperature
  • Tapered piston pin for reduced weight
Picture
VHM pistons are 100% CNC machined from high quality material and have a non-circular profile to better prevent engine lockups. They stand for high performance, longevity and keeping high performance during it's lifetime. This piston consists of an inside coating, which reduces micro welding, lowers the friction on the pin, prevents piston bore galling and provides a very good thermal conduction. Furthermore, this piston includes special Z-clips, which prevents the clips from circling and affecting the groove.
  • High performance
  • Direct replacement
  • Inside coating and Z-clips
  • Longevity
  • Keeps high performance during lifetime
This piston needs a clearance of 0.07mm!

HRC 'FLAT TOP' A-KIT PISTONS & 0.7mm PISTON RINGS

HRC Flat Top Piston  -  Sold Out  -  Sales Finished   
HRC 0.7mm Flat Top Piston Ring  -  Sold Out  -  Sales Finished
Picture
 Please note: The HRC 'Flat Top' Piston & 0.7mm Piston Ring is now discontinued and sales finished by Honda.
                    Honda / HRC do not plan to make any further 'Flat Top' Pistons & 0.7mm Piston Rings.

VHM 2 PIECE KIT CYLINDER HEADS

VHM CYLINDER HEAD Cover (Standard 5-Stud)                             £225.00 + VAT   
VHM CYLINDER HEAD Cover (A-Kit 6 Stud & JHA A-kit RS-V)       £235.00 + VAT
Picture
Picture
Picture
VHM INDIVIDUAL HEAD INSERT (11.20cc / 11.40cc / 11.60cc)                                                                                                              £70.00 + VAT  
VHM INDIVIDUAL BLANK HEAD INSERT                                                                                                                                                 £70.00 + VAT  
VHM INDIVIDUAL SPECIAL MADE HEAD INSERT (All Head Volumes Available for Leaded & Unleaded Fuel)                                    £85.00 + VAT  
VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR 'FLAT-TOP' PISTON (Available for Leaded & Unleaded Fuel)                       £85.00 + VAT  
VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR JHA KIT (Available for Leaded & Unleaded Fuel)                                           £85.00 + VAT  
VHM INDIVIDUAL SPECIAL MADE HEAD INSERT FOR SEEL KIT (Available for Leaded & Unleaded Fuel)                                         £85.00 + VAT
Picture
Picture

VHM SQUISH, COMPRESSION & VOLUME MEASUREMENT TOOL

VHM PISTON PROJECTION / SQUISH SETTING TOOL      £157.50 + VAT
Picture
PISTON HEIGHT TOOL - USER INSTRUCTIONS
An absolute 'must have' to achieve accurate squish, volume and port timing

TALON CLUTCH BASKETS

1995~2016 TALON BILLET HARD NICKEL PLATED OUTER CLUTCH BASKET  Much stronger than the original cast clutch baskets          £119.00 + VAT
Picture
Picture

CLUTCH BASKET CUSH DRIVE RUBBERS

1995~2016 HINSON REPLACEMENT CUSH DRIVE RUBBERS FOR STANDARD/TALON/HINSON CLUTCH BASKET            £70.00 + VAT
Picture

HRC HONDA RS125 DETONATION COUNTERS

HRC DETONATION COUNTER - With Data Logger Outlet - necessary to use with HRC DataLogger & HRC/Jha Ignition            £1,025.00 + VAT
Picture
Go to hrc detonation counter page

HRC DETONATION SENSOR LEAD

HRC DETONATION SENSOR - replacement HRC detonation sensor lead        Discontinued - Sold Out
Picture
​Click the button below for information about our replacement Detonation Sensor wire.
Replacement for the HRC Detonation Sensor

DETONATION COUNTER

DETONATION COUNTER  From £160.00 + VAT
Picture
go to detonation detection system page

NGK SPARK PLUGS & CAPS

NGK R7282-105     RS125/RS250  'short'  SPARK PLUG                   £80.00 + VAT  
NGK R7282A-105   DETONATION COUNTER SPARK PLUG           £110.00 + VAT

NGK TRS1225B SPARK PLUG CAP                                                   £70.00 + VAT
Picture

IGNITION CURVE CHANGERS

1995~2016 RS125 16 Setting IGNITION CURVE CHANGER   - Simple to fit to Standard ignition, boosting mid-range power and over rev.        £245.00 + VAT
Picture
go to ignition curve changer page

Exports of all parts supplied outside of UK, to EU Countries, USA, Australia, South Africa, Asia etc are exempt from UK VAT and will be charged 0% VAT.
On arrival to your destination country, you may be asked to pay additional duties and taxes by customs, before the shipment is delivered.
Import tax, customs & duties regulations vary from country to country.
​Payment of all Import tax, customs & duties charges are the responsibility of the customer.

Return to Honda RS125
home
SP125 Limited
22 Walker Wood,  Baildon,  Shipley,  West Yorkshire,  BD17 5BE,  England
Telephone 01274 583231      steve@sp125racing.com      Mobile 07738 626165
Picture
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.
Powered by Create your own unique website with customizable templates.