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M8 and M6  Stud Detector

This system is optimised for Honda RS125 / Honda RS250 / Yamaha TZ250 Engines.

The number of detonations on 1 or 2 cylinders can be displayed if the counter is connected.

RS125 Honda or other Single Cylinder    :           Simple detonation detection

               1 detonation detector

               1 power lead and blue indicator flash

RS125 Honda or other Single Cylinder    :           Detonation detection and connecting to a data logger

               1 detonation detector

               1 off power lead with data out

RS125 Honda or other Single Cylinder    :           Detonation detection and counter

               1 detonation detector

               1 power lead and blue indicator flash

The power lead can include either a blue indicator and/or a connector to a data logger.

RS250 Honda or TZ250 Yamaha or other Twin Cylinder    :   Simple detonation detection

               2 detonation detector

               2 power lead and blue indicator flash

RS250 Honda or TZ250 Yamaha or other Twin Cylinder    :   Detonation detection and connecting to a data logger

               2 detonation detector

               2 off power lead with data out

RS250 Honda or TZ250 Yamaha or other Twin Cylinder    :    Detonation detection and counter

               2 detonation detector

               1 power lead and blue indicator flash

Stud Detector unit

Stud Detector unit

M6 and M8 Stud detectors

The (A) output can be coupled to other type of detonation detection systems such as           

On powering up the unit will generate a detonation signal and/or flash the indicator this is normal and provides a test for the power and indicator

. The counter unit does not have a compatible high voltage detonation output for loggers this signal would be taken from the detector unit/s.

Reading the count on generator only powered engines

The count values on the counter are retained even without power connected to read on a generator only motorcycle then build a small 12 to 14V battery ( 500mAH or above ) with a connector and power the motorcycle for the short period required to read the display.

Installation Procedure for the M6 / M8 stud detector

The mounting position should be on the head bolts or as central as possible and in the top half of the engine.

For the M6 :

For the M8 :

The whole of the sensors metal surface needs to be in level contact.

The sensor should be tightened to the normal head nut tightness.

Only use a copper washer between the head and the detector if the washer is required for the water seal such as on a Honda RS125 and Honda RS250, this will require adjustment to the sensitivity of the detection.

Also route all detector cables away from HT leads or the coil.

If connecting the unit to an AIM MyChron extreme then the power connection can be via the signal connector

NOTE :

. Mount the blue indicator in the dash foam pointing towards the rider.

. Velcro mount the detector amplifier unit to the inside of the chassis:

. Ensure all cables are away from the HT leads, if the HT lead goes right route the detonation lead left.

. Velcro mount the counter unit in a visible position and ensure that the button cannot be pressed accidentally or pushed by other cables.

. Use the coloured tie-wraps to indicate which cylinder is which; red=1, blue=2 ensure that the leads are in the correct connectors for cylinders.

Sensitivity

With the stud surface sensor, the detection level will vary between engine makes and the position mounted used, the sensitivity will need to be initially adjusted to suit.

The Amplifier has adjustable sensitivity using a 15 turn control screw; turning clockwise will increase the sensitivity and anticlockwise will decrease the sensitivity of the detector.

Turn back the screw anti-clockwise to make less sensitive.

If the sensitivity is still too high then please contact the office as a suitable washer placed between the cylinder head or block with reduce the detection sensitivity

Excessive Detonation count

. The effect that the sensor detects can also be caused by mechanical bangs. Worn bearings in the crank or con rod can easily slap against the cylinder head when a higher revs.

. Interference can also cause the detector amplifier to detect non existent detonation, the cables and amplifier must be mounted away from the HT coil, HT wire or the LT coil drive wiring.

. Mid throttle (on the Needle / lean needle) detonation can cause actual detonation to occur that is not damaging to the piston but is still a detonation and will still be detected / counted.

Options:

. 1.5m Extension cable for carts this allow the counter and/or the blue indicator flash to be mounted at the front / steering wheel

. Connections to loggers … please contact office for details / options available

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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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.