| 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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| 1995/2006 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. All 'special order' parts, that are ordered specially under the instruction of the customer, are non returnable and non refundable. |
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