Race Tuning 05-07 Kx250 n3fu
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SERVICE INFORMATION
Category Technical Service Information Model KX250R6F Serial No. Date TSI552 Dec. 29, 2005
Subject KX250R6F Model Race Tuning Detail The following modifications increase midrange and high-speed power, making the vehicle more competitive for the experienced racer. Fig.1 Tuning Effects
Stock (US)
Modified 1
(Cylinder tuning & compression ratio increase)
Modified 2
(Cylinder tuning & compression ratio decrease)
Output
Stock (EU)
Engine rpm
CAUTION Kawasaki cannot accept any responsibility for the results of the modifications described in this Service Information. Whenever the power output of an engine is increased, the reliability and durability of the engine decreases. This is especially true of competition engines, which are highly stressed even in stock form. For best results, engine modification should be made by an experienced tuner.
Page 1 of 6 Quality Division, Consumer Products & Machinery Company, Kawasaki Heavy Industries, Ltd.
T E C H N I C A L S E R V I C E I N F O R M A T I O N
Modification Procedure 1) Cylinder (see Fig.2, 3 and 4) Polish and smooth the intake, exhaust, and scavenging ports (particularly the areas in each port near the cylinder bore). Chamfer the main / sub exhaust ports as shown (Fig. 2, 3 and 4). Adjust the main/ sub scavenging ports timing to match the illustration (Fig. 2). CAUTION Maintain the original shape of the ports, and chamfer the sharp edges to prevent ring damage. Removing more material than specified may result in a loss of power. NOTE ○ Use a racing fuel with Research Octane Number (RON) 98 ～100 to help prevent abnormal combustion accompanied by increase in compression caused by this modification.
Fig. 2
(1) Exhaust Port (2) Sub-exhausting Ports (3) Scavenging Ports
S E R V I C E
(4) Sub-scavenging Ports (5) No.3 SC Port
Fig. 3
TSI552
T E C H N I C A L
Page 2 of 6
I N F O R M A T I O N
Fig. 4
T E C H N I C A L 2) Compression ratio selection US model Track Type
Hard Track
Cylinder Head
P/N 11001-034(STD)
Normal Track Grind the head P/N 11001-034 as shown in Fig.5
Sand Track
Carburetor Setting *
STD
MJ: 1 size up
STD
Compression Ratio
ε=9.1
ε=9.3
ε=8.9
P/N 11001-048 (Optional)
* The carburetor setting above should only provide a rule of thumb. Be sure to adjust to the proper setting after running the vehicle.
I N F O R M A T I O N
Fig. 5
TSI552
S E R V I C E
Page 3 of 6
EU model Track Type Cylinder Head **
Normal and Hard P/N 11001-034(STD)
Carburetor Setting *** Compression Ratio
Sand Track
Tracks
P/N 11001-068 (Optional)
----------
---------
ε=8.9
ε=8.6
Deep Sand Track P/N 11001-068(Optional) MJ: 2 sizes up ε=8.6
**If smooth characteristics are preferred for the normal or hard track, use the cylinder head P/N 11001-0068. ***The carburetor setting above should only provide a rule of thumb. Be sure to adjust to the proper setting after running the vehicle.
3) Flywheel Magneto Rotor (Optional Parts) Five (5) optional rotors are available. The standard flywheel can be substituted with one of the optional rotors shown below to better suit the track conditions. [Table of Inertia Moment] P/N
Inertia Moment (kg･cm2)
Racing Conditions
21007-1425 21007-1424 21007-1429 21007-1426 21007-1427 21007-1428
4.0 4.5 4.9 5.3 5.6 5.9
Increase in throttle response
Increase in rear wheel traction
4) Spark Plug Use the specified racing spark plug. Spark Plug P/N R7376-8 (NGK) 92070-1275 5) Gasoline Use an unleaded gasoline with Research Octane Number (RON) 98-100. NOTE ○ Use of a regular or not recommended gasoline or leaner air-gasoline mixture may cause abnormal combustion or damage to engine. CAUTION Use of leaded fuel is illegal in some countries, states or territories. Check local regulations before using leaded fuel.
Carburetor Optional Parts The carburetor setting may need to be adjusted according to the track conditions, temperature, atmospheric pressure, the rider’s feel and other factors. The optional parts for the model KX250R6F are shown in the last page of this Service Information.
TSI552
Page 4 of 6
T E C H N I C A L S E R V I C E I N F O R M A T I O N
Warranty Information This Service Information is racing information only, not warranty authorization.
T E C H N I C A L S E R V I C E I N F O R M A T I O N
TSI552
Page 5 of 6
Carburetor Setting and Optional Parts 1) Base Jetting SJ
AS
NJ BPP Height Choke Height Well Dia.
#8.0 PWK #160 #55 NALF-2 #50 38S (2.5×1.0)
1 1/2
0 mm
Markets Body ALL
MJ PWJ
JN
CA
7.45 (With Slit)
φ3.6
5.0
POP
BP
10.5 φ0.8
PO
ID Mark
φ1.5 φ0.7
J045A
T E C H N I C A L
2) JN Optional Parts
P/No.
ID Mark
16187-0167 16187-0157 16187-0158 16187-0159 16187-0160 16187-0168 16187-0162 16187-0163 16187-0164 16187-0165
NFTE F G H W
D φ2.695 φ2.705 φ2.715 φ2.725 φ2.735
NFUE F G H W
φ2.695 φ2.705 φ2.715 φ2.725 φ2.735
l1
l2
l3
θ1
θ2
A/F Condition
27.60
42.40
47.40
1°27’57”
3°0’0”
Richer STD (Clip Position 2nd) Leaner
27.15
41.95
1°27’57”
46.95
3°0’ 0”
Richer
Leaner * NAL is richer than NAF (0.5 Clip Position).
3) CA Optional Parts P/No. 16025-1217 16025-1215 16025-1216
4) PWJ Optional Parts
Number #8(2.5×1.5) #6(2.5×1.5) #7(2.5×1.5)
Remark STD OP OP
5) SJ Optional Parts P/No. 92064-1142 92064-1143 92064-1144 92064-1130 92064-1145
TSI552
P/No 16159-1053 16159-1055 16159-1054 16159-1056 16159-1057
Number #50 #52 #55 #58 #60
Remark OP OP STD OP OP
Number #155 #158 #160 #162 #165 #170
Remark OP OP STD OP OP OP
6) MJ Optional Parts Number #45 #48 #50 #52 #55
Remark OP OP STD OP OP
KHI No. 92063-1366 92063-1367 92063-1368 92063-1369 92063-1370 92063-1372
Page 6 of 6
S E R V I C E I N F O R M A T I O N
Category Technical Service Information Model KX250R6F Serial No. Date TSI552 Dec. 29, 2005
Subject KX250R6F Model Race Tuning Detail The following modifications increase midrange and high-speed power, making the vehicle more competitive for the experienced racer. Fig.1 Tuning Effects
Stock (US)
Modified 1
(Cylinder tuning & compression ratio increase)
Modified 2
(Cylinder tuning & compression ratio decrease)
Output
Stock (EU)
Engine rpm
CAUTION Kawasaki cannot accept any responsibility for the results of the modifications described in this Service Information. Whenever the power output of an engine is increased, the reliability and durability of the engine decreases. This is especially true of competition engines, which are highly stressed even in stock form. For best results, engine modification should be made by an experienced tuner.
Page 1 of 6 Quality Division, Consumer Products & Machinery Company, Kawasaki Heavy Industries, Ltd.
T E C H N I C A L S E R V I C E I N F O R M A T I O N
Modification Procedure 1) Cylinder (see Fig.2, 3 and 4) Polish and smooth the intake, exhaust, and scavenging ports (particularly the areas in each port near the cylinder bore). Chamfer the main / sub exhaust ports as shown (Fig. 2, 3 and 4). Adjust the main/ sub scavenging ports timing to match the illustration (Fig. 2). CAUTION Maintain the original shape of the ports, and chamfer the sharp edges to prevent ring damage. Removing more material than specified may result in a loss of power. NOTE ○ Use a racing fuel with Research Octane Number (RON) 98 ～100 to help prevent abnormal combustion accompanied by increase in compression caused by this modification.
Fig. 2
(1) Exhaust Port (2) Sub-exhausting Ports (3) Scavenging Ports
S E R V I C E
(4) Sub-scavenging Ports (5) No.3 SC Port
Fig. 3
TSI552
T E C H N I C A L
Page 2 of 6
I N F O R M A T I O N
Fig. 4
T E C H N I C A L 2) Compression ratio selection US model Track Type
Hard Track
Cylinder Head
P/N 11001-034(STD)
Normal Track Grind the head P/N 11001-034 as shown in Fig.5
Sand Track
Carburetor Setting *
STD
MJ: 1 size up
STD
Compression Ratio
ε=9.1
ε=9.3
ε=8.9
P/N 11001-048 (Optional)
* The carburetor setting above should only provide a rule of thumb. Be sure to adjust to the proper setting after running the vehicle.
I N F O R M A T I O N
Fig. 5
TSI552
S E R V I C E
Page 3 of 6
EU model Track Type Cylinder Head **
Normal and Hard P/N 11001-034(STD)
Carburetor Setting *** Compression Ratio
Sand Track
Tracks
P/N 11001-068 (Optional)
----------
---------
ε=8.9
ε=8.6
Deep Sand Track P/N 11001-068(Optional) MJ: 2 sizes up ε=8.6
**If smooth characteristics are preferred for the normal or hard track, use the cylinder head P/N 11001-0068. ***The carburetor setting above should only provide a rule of thumb. Be sure to adjust to the proper setting after running the vehicle.
3) Flywheel Magneto Rotor (Optional Parts) Five (5) optional rotors are available. The standard flywheel can be substituted with one of the optional rotors shown below to better suit the track conditions. [Table of Inertia Moment] P/N
Inertia Moment (kg･cm2)
Racing Conditions
21007-1425 21007-1424 21007-1429 21007-1426 21007-1427 21007-1428
4.0 4.5 4.9 5.3 5.6 5.9
Increase in throttle response
Increase in rear wheel traction
4) Spark Plug Use the specified racing spark plug. Spark Plug P/N R7376-8 (NGK) 92070-1275 5) Gasoline Use an unleaded gasoline with Research Octane Number (RON) 98-100. NOTE ○ Use of a regular or not recommended gasoline or leaner air-gasoline mixture may cause abnormal combustion or damage to engine. CAUTION Use of leaded fuel is illegal in some countries, states or territories. Check local regulations before using leaded fuel.
Carburetor Optional Parts The carburetor setting may need to be adjusted according to the track conditions, temperature, atmospheric pressure, the rider’s feel and other factors. The optional parts for the model KX250R6F are shown in the last page of this Service Information.
TSI552
Page 4 of 6
T E C H N I C A L S E R V I C E I N F O R M A T I O N
Warranty Information This Service Information is racing information only, not warranty authorization.
T E C H N I C A L S E R V I C E I N F O R M A T I O N
TSI552
Page 5 of 6
Carburetor Setting and Optional Parts 1) Base Jetting SJ
AS
NJ BPP Height Choke Height Well Dia.
#8.0 PWK #160 #55 NALF-2 #50 38S (2.5×1.0)
1 1/2
0 mm
Markets Body ALL
MJ PWJ
JN
CA
7.45 (With Slit)
φ3.6
5.0
POP
BP
10.5 φ0.8
PO
ID Mark
φ1.5 φ0.7
J045A
T E C H N I C A L
2) JN Optional Parts
P/No.
ID Mark
16187-0167 16187-0157 16187-0158 16187-0159 16187-0160 16187-0168 16187-0162 16187-0163 16187-0164 16187-0165
NFTE F G H W
D φ2.695 φ2.705 φ2.715 φ2.725 φ2.735
NFUE F G H W
φ2.695 φ2.705 φ2.715 φ2.725 φ2.735
l1
l2
l3
θ1
θ2
A/F Condition
27.60
42.40
47.40
1°27’57”
3°0’0”
Richer STD (Clip Position 2nd) Leaner
27.15
41.95
1°27’57”
46.95
3°0’ 0”
Richer
Leaner * NAL is richer than NAF (0.5 Clip Position).
3) CA Optional Parts P/No. 16025-1217 16025-1215 16025-1216
4) PWJ Optional Parts
Number #8(2.5×1.5) #6(2.5×1.5) #7(2.5×1.5)
Remark STD OP OP
5) SJ Optional Parts P/No. 92064-1142 92064-1143 92064-1144 92064-1130 92064-1145
TSI552
P/No 16159-1053 16159-1055 16159-1054 16159-1056 16159-1057
Number #50 #52 #55 #58 #60
Remark OP OP STD OP OP
Number #155 #158 #160 #162 #165 #170
Remark OP OP STD OP OP OP
6) MJ Optional Parts Number #45 #48 #50 #52 #55
Remark OP OP STD OP OP
KHI No. 92063-1366 92063-1367 92063-1368 92063-1369 92063-1370 92063-1372
Page 6 of 6
S E R V I C E I N F O R M A T I O N
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