| SP125 Limited | ||||||
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22 Walker Wood, Baildon, Shipley, West Yorkshire, BD17 5BE, England |
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Telephone 01274 583231 steve@sp125racing.com Mobile 07738 626165 |
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| 1995/2008 RS125 - 16 settings Ignition Curve Changer | ||||||
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(Shown with outer cover removed) |
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| 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 to | ||||||
| increase 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 | ||||||
| Fig 1. Standard RS125 Curve Changer | ||||||
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| Fig 2. 16 setting RS125 Curve Changer | ||||||
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| 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) | ||||||
ROTATE THE IGNITION ADJUSTER PLATE ANTI- CLOCKWISE
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| 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 increased | ||||||
| to 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 main | ||||||
| clutch/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 tyraps, 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 | ||||||
| RS125 Honda : £245.00 + VAT | ||||||
| RS250 Honda / TZ250 Yamaha : £265.00 + VAT | ||||||
| You can now upgrade the original Curve Changers to the new 16-Setting Curve Changer | ||||||
| Upgrade RS125 : £130.00+VAT | ||||||
| Upgrade RS250 / TZ250 Yamaha : £160.00+VAT | ||||||
| (not supplied with the loom connector and existing original curve changer unit must be returned to us) | ||||||
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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 |
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| CALL STEVE PATRICKSON | ||||||
| 01274 583231 or 07738 626165 | ||||||
| OR SEND YOUR E-MAIL TO | ||||||
| steve@sp125racing.com | ||||||
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| 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. | ||||||
