1995/2004 RS125 HONDA - 16 settings Ignition Curve Changer
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Change your Standard RS125 Honda ignition-timing map the easy way
The Curve Changer will alter and improve your ignition map profile.
The reason the curve changer works is that the standard ignition is a generalisation for all
... it is not too difficult to tune, suitable for all fuels, all gearing, etc.
After designing a programmable ignition for the RS125 and RS125 Power Valve, the largest requirement was toincrease the drive area advance, without then causing the over rev to 'brick wall' do to its increased compression effect.
A simpler lower cost unit could provide this requirement. … The curve changer
The largest advantage is in the increase in the spread of power.
The 16 settings unit is an enhancement of the standard RS125 Curve Changer.
It allows a switch selectable range of map alteration.
By using fixed switch values the result is accurate and repeatable.
The switch has 16 positions 0..9,A,B,C,D,E,F:
(0) Is 80% of the standard curve changer value.
(8) Is the same as the standard curve changer value.
(F) Is 120% of the standard curve changer value.
Each switch position is a 2.5% step in the curve changer value.
With a higher curve changer switch values the static advance will need to be advanced.
See the table below
The reason the curve changer works is that the standard ignition is a generalisation for all
... it is not too difficult to tune, suitable for all fuels, all gearing, etc.
After designing a programmable ignition for the RS125 and RS125 Power Valve, the largest requirement was toincrease the drive area advance, without then causing the over rev to 'brick wall' do to its increased compression effect.
A simpler lower cost unit could provide this requirement. … The curve changer
The largest advantage is in the increase in the spread of power.
The 16 settings unit is an enhancement of the standard RS125 Curve Changer.
It allows a switch selectable range of map alteration.
By using fixed switch values the result is accurate and repeatable.
The switch has 16 positions 0..9,A,B,C,D,E,F:
(0) Is 80% of the standard curve changer value.
(8) Is the same as the standard curve changer value.
(F) Is 120% of the standard curve changer value.
Each switch position is a 2.5% step in the curve changer value.
With a higher curve changer switch values the static advance will need to be advanced.
See the table below
Installation Procedure
1. Advance the static timing
Initial Base setting
Set the curve changer unit to setting 8.
Elongate the timing slot to adjust to what would be the 6th line (there are only 3 lines there as standard)
Initial Base setting
Set the curve changer unit to setting 8.
Elongate the timing slot to adjust to what would be the 6th line (there are only 3 lines there as standard)
ROTATE THE IGNITION ADJUSTER PLATE ANTI- CLOCKWISE
Installation Procedure
Fine Adjustment
If the over-rev is brick walling (will not rev out at max RPM) but has strong acceleration then turn the curve changer switch up one setting
If the over-rev is higher, but the acceleration not strong, then turn the curve changer switch down one setting
Specialist setting
To increase the curve changer effect (drive advance and over-rev) and retain the mid range,the static plate needs to be advanced more and at the same time the curve changer setting increasedto return the timing to the correct level:
For 5 degrees of ignition adjuster plate advance = Setting 0
For 5.5 degrees of ignition adjuster plate advance = Setting 4
For 6 degrees of ignition adjuster plate advance = Setting 8 ( standard position )
For 6.7 degrees of ignition adjuster plate advance = Setting A
For 7.5 degrees of ignition adjuster plate advance = Setting F
Settings over 6 degrees will require the widening of the back-plate slots
2. Connect the curve Changer
Locate the 2 wires from the Ignition Pulse Generator (30300-NX4-003) which come out of the mainclutch/water-pump cover on the right side of the engine.
Solder the Curve Changer wires onto these wires as follows:
Curve Changer Yellow wire connects to the Pulse Generator ‘White with Yellow stripe’ wire.
Curve Changer Blue wire connects to the Pulse Generator ‘White with Blue stripe’ wire.
Tape the joins with tape.
Pull back the outer sleeving.
Plug in the Curve Changer.
By using a tyrap, or the Velcro on the unit, the Curve Changer then can easily be fastened to the front of the frame,for easy adjustment access.
3. Check
Remember to allow for carburetion changes, increase the main by 2 jet sizes to be safe.
Use of a detonation indicator or counter is recommended.
In Stock now
PRICES
RS125 Honda : GBP £245.00 + VAT
RS250 Honda / TZ250 Yamaha : GBP £265.00 + VAT
If the over-rev is brick walling (will not rev out at max RPM) but has strong acceleration then turn the curve changer switch up one setting
If the over-rev is higher, but the acceleration not strong, then turn the curve changer switch down one setting
Specialist setting
To increase the curve changer effect (drive advance and over-rev) and retain the mid range,the static plate needs to be advanced more and at the same time the curve changer setting increasedto return the timing to the correct level:
For 5 degrees of ignition adjuster plate advance = Setting 0
For 5.5 degrees of ignition adjuster plate advance = Setting 4
For 6 degrees of ignition adjuster plate advance = Setting 8 ( standard position )
For 6.7 degrees of ignition adjuster plate advance = Setting A
For 7.5 degrees of ignition adjuster plate advance = Setting F
Settings over 6 degrees will require the widening of the back-plate slots
2. Connect the curve Changer
Locate the 2 wires from the Ignition Pulse Generator (30300-NX4-003) which come out of the mainclutch/water-pump cover on the right side of the engine.
Solder the Curve Changer wires onto these wires as follows:
Curve Changer Yellow wire connects to the Pulse Generator ‘White with Yellow stripe’ wire.
Curve Changer Blue wire connects to the Pulse Generator ‘White with Blue stripe’ wire.
Tape the joins with tape.
Pull back the outer sleeving.
Plug in the Curve Changer.
By using a tyrap, or the Velcro on the unit, the Curve Changer then can easily be fastened to the front of the frame,for easy adjustment access.
3. Check
Remember to allow for carburetion changes, increase the main by 2 jet sizes to be safe.
Use of a detonation indicator or counter is recommended.
In Stock now
PRICES
RS125 Honda : GBP £245.00 + VAT
RS250 Honda / TZ250 Yamaha : GBP £265.00 + VAT
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.
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.
SP125 Limited
22 Walker Wood, Baildon, Shipley, West Yorkshire, BD17 5BE, England
Telephone 01274 583231 steve@sp125racing.com Mobile 07738 626165
22 Walker Wood, Baildon, Shipley, West Yorkshire, BD17 5BE, England
Telephone 01274 583231 steve@sp125racing.com Mobile 07738 626165
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.
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.
