Rising Sun Cycles LLC   Racer's Parts in Racer's Time
RISING SUN CYCLES
HOME|CONTACT


Road Racing OEM & Aftermarket Parts and Accessories

News and Important Announcements Racing Motorcycles
For Sale
Accessories
and Product Index
Tools Specials & Clearance Search
Chassis & Related Engine Cowling Tire/Wheel Garments and Safety Lubes

DETONATION COUNTER  KIT

for RS125R

 
The detonation counter sensor picks up an engine's irregular combustion (detonation) and displays the number of times it occurs on the detonation counter unit. When used with the HRC Data Logger (RS125R/ 250R), the counter provides a detailed detonation map which greatly assists in carburetor setting.

Kit Contents:
•Detonation Counter•Plug Cap •Spark Plug •Sensor Assy •Detonation Counter unit stay •Rivet •Washer •Wire Harness •Sub Harness

Main Features:
Detonation Unit
•Voltage 12V
•Usable Temperature 0ĹC~60ĹC
•Counter Display Time Maintained @30 min
•Data Logger Output 5 Pulse Output (pulse width 10msec)
Sensor
•Spark Plug Washer Type

06501-NX4-730 RS125
06501-NX5-730 RS250


Detonation Counter Parts Lists
  1995-2002 RS125R  
NO Part No Name QTY in Set
1 06501-NX4-730 SET, DET COUNTER 1
2 30700-NX5-003 CAP, ASSY NOISE SUPPRESOR 1
3 31940-NX5-851 SPARK PLUG R6120A-10.5 1
4 32110-NX4-970 HARNESS WIRE DETONATION 1
5 32111-NX4-730 SERVICE SUB HARNESS 1
6 38510-NX4-650 SENSOR ASSY, PI 1
7 38610-NX4-730 UNIT ASSY., DETONATION 1
8 38620-NX4-970 STAY, D/C 1
9 90402-NF5-630 WASHER 14.1*20.8*1.2 1
10 91081-ND4-750 BLIND RIVET, 3.2*8 2
     
  1993-2002 RS250R  
NO Part No Name QTY in Set
1 06501-NX5-730 SET, DET COUNTER 1
2 31940-NX5-851 SPARK PLUG R6120A-10.5 2
3 32110-NX5-850 HARNESS WIRE DETONATION 1
4 32111-NX5-730 SERVICE SUB HARNESS 1
5 38510-NX4-650 SENSOR ASSY, PI 2
6 38610-NX5-730 UNIT ASSY., DETONATION 1
7 38620-NX5-850 HOLDER, D/C 1
8 64111-181-000 BAND, FR NUMBER PLATE 1
9 90402-NF5-630 WASHER 14.1*20.8*1.2 2
10 91081-ND4-750 BLIND RIVET, 3.2*8 4


Installation Notes CLICK HERE

  RS125R / RS250R
Detonation
  Detonation will occur at before or after the maximum output speeds (if peak speed is 12500 rpm, detonation occurrence ranges from 12250 to 12750 rpm). Detonation seldom occurs outside these speed ranges.
As shown below, 5th and 6th gears provide less acceleration than 1st and 2nd gears where there is extended use of these detonation range speeds. For this, circuits with more acceleration and deceleration frequencies give less detonation occurrence than circuits where there is extended use of wide open throttle operation using 5th and 6th gears.
Frequent use of low ratio and 12750 rpm and over resulting from ratio choices will control propensity toward detonation. Also, distinct behavior of driving will result in less detonation associated with partial throttle opening.
 
 
 
 
In the engine output characteristics figure shown above, peak speed are changing, depending on wide open throttle to partial throttle. Accordingly, detonation occurrence ranges may vary with throttle opening. Detonation may suddenly take place when returning throttle from fully wide-open throttle at 11000 rpm.
 
Counting at fully wide open ranges tends to lead to damages, but counting at partial range will lead to less damages. Accordingly, you should find your base because counts are different from rider behaviors to course lay outs.
Criteria for detonation counter
  Many riders seem to have detonation counters fitted on their machines for information used for settings. Both the RS125R and RS250R should have detonation counter numbers of one to two per kilometer as criteria.
In the case of the Suzuka Circuit with one lap length of about 6 kilometer, the criteria for the counter will be 12 per lap.
As mentioned before, detonation will occur in needle ranges such as partial throttles as well as the fully open main region. You should check where values gained from the counters occur. One to two/km in the main region are recommended.
Countermeasures against detonation
 
Even rich settings may lead to detonation for the following reasons.
Damaged pistons or heads are found at the engine maintenance.
(CAUSE)
High secondary compression
Advanced ignition timing
Chambers or silencers have been replaced or have deformation or dents
Secondary air is breathed in
Fuel strainers or tank one-way valves are clogged
Old gasoline is used
JET NEEDLE, SLOW JET, or PWJ other than MAIN JET are lean Too early power jet cut
No engine damage is found but too may count numbers found.
(CAUSE)
Defective tightening torque for counter sensors
Counter sensor or counter body is picking up vibration
Counter cord is picking up electrical noises
Disconnected counter cord
Lack of counter voltage
Previously damaged pistons or heads are used
The engines is damaged, but no count found.
(CAUSE)
Sensor tightening torque is below specified
Failed sensor/counter
Disconnected coupler or ingress of water
Defective carburetor (check float movement)