Product Manual

2. Technical Data
Model TBC-230B series TBC-230 series TBC-250PF series TBC-2501 series
Displacement (cc)
21.1 21.1 23.9 25.0
Bore x Stroke (mm) 31 x 28 31 x 28 33 x 28 34 x 27
Compression ratio 6.0 : 1 6.0 : 1 7.3 : 1 7.2 : 1
Max. kW/rpm 0.63/7500 0.63/7500 0.82/8000 0.90/7500
Max. kg Em/rpm 0.086/5500 0.086/5500 0.12/5500 0.13/5500
Max. rpm 11000 11000 11000 11000
Idling rpm 3000 ±200 3000 ±200 3000 ±200 3000 ±200
Clutch-meet rpm 3800 ±200 3800 ±200 3800 ±200 3800 ±200
Carburetor (maker/type
)
WYL182 WYL182 WYJ318 WYJ296
Fixed Jet (main jet #) #38 #38 #38 # 43
L/H needle set N/A N/A N/A N/A
Metering lever height (mm)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
Ignition system
TCI (Transistorized
Solid State)
TCI (Transistorized
Solid State)
CDI (Capacitor
Discharge Ignition
System)
TCI (Transistorized
Solid State)
Air gap (mm) 0.30 - 0.35 0.30 - 0.35 0.30 - 0.35 0.30 - 0.35
Ignition timing (
K
) ----- ----- 25 -----
Spark plug(maker) CJ8Y(CHPN) or CJ8Y(CHPN) or RCJ6Y(CHPN) CJ6(CHPN) or
RCJ8Y(CHPN) RCJ8Y(CHPN) BMR7A(NGK)
Gap (mm) 0.6 0.6 0.6 0.6
Clutch drum diameter (mm) 54 54 54 54
Gear Ratio
1.25 : 1
(
Curved sfaft 1: 1
)
1.25 : 1
1.25 : 1
(
Curved sfaft 1: 1
)
1.25: 1
Model TBC-270PF series TBC-270 series TBC-290 series TBC-340 series
Displacement (cc) 25.6 26.9 28.0 32.2
Bore x Stroke (mm) 33 x 30 35 x 28 34.5 x30 37 x 30
Compression ratio 8.0 : 1 6.0 : 1 6.8 : 1 6.5 : 1
Max. PS/rpm 1.23/8000 1.24/7000 1.42/8000 1.6/8000
Max. kW/rpm 0.90/8000 0.92/7000 1.05/8000 1.17/8000
Max. kg Em/rpm 0.12/6000 0.14/5000 0.14/4000 0.16/6000
Max. rpm 11000 11000 11000 11000
Idling rpm 3000 ±200 3000 ±200 3000 ±200 3000 ±200
Clutch-meet rpm 3800 ±200 3800 ±200 3800 ±200 3800 ±200
Carburetor (maker/type
)
WYJ243
A
WYJ431 WYJ392 WYJ296
Fixed Jet (main jet #) # 38 # 42 # 43 # 43
L/H needle set N/A N/A N/A N/A
Metering lever height (mm)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
1.50 ±0.16 (frm face
of pump body)
Ignition system
CDI (Capacitor
Discharge Ignition
System)
TCI (Transistorized
Solid State)
TCI (Transistorized
Solid State)
TCI (Transistorized
Solid State)
Air
g
a
p
(
mm
)
0.30 - 0.35 0.30 - 0.35 0.30 - 0.35 0.30 - 0.35
Ignition timing (
K
) 32 N/A N/A N/A
Spark plug(maker) CJ-6Y(CHPN) or BPM6A (NGK) or RCY8Y(CHPN) RCY8Y(CHPN)
RCJ-6Y(CHPN) RCY8Y(CHPN)
Gap (mm) 0.6 0.6 0.6 0.6
Clutch drum Diameter (mm) 54 54 54 78
Gear Ratio 1.286 : 1 1.25 : 1 1.28 : 1 1.28 : 1
2
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