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BASIC CARBURETOR SETTING
Type Keihin CR39 Keihin CR39 Keihin CR39 Keihin CR39 Keihin CR39 Keihin CR39
Carb.-setting number 031299 130799 100699 250899 250401 240401
Main jet 175 175 175 175 175 175
Jet needle OBDTM
OBDVR
OBDTM OBDTM
OBDVR OBDVR
Idling jet 48 48 48 48 48 48
Main air jet 200 200 200 200 200 200
Idling air jet 100 100 100 100 100 100
Needle clip position 4.th from top 3.th from top 2.th from top 3.th from top 6. th from top 3. th from top
Starting jet 85 85 85 85 85 85
Mixture control screw open
11,252,5 1 1,25 1
Throttle valve 15 15 15 15 15 15
Performance restrictor
–
slide stop24,5mm
–– ––
Stop pump membrane 055 055 055 055 055 055
400 SX RACING
400 MXC/EXC RAC.
400 EXC RAC. 12 kW
520 EXC RAC. 12,5 kW
520 MXC/EXC
RACING
520 SX RACING
400 EXC-G
520 EXC-G
Type 400 SX 400 MXC 400 EXC 520 SX 520 MXC 520 EXC
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement 398 ccm 510 ccm
Bore/Stroke 89 / 64 mm 95 / 72 mm
Ratio 11 : 1
Fuel unleaded premium gasoline with at least RON 95
Valve Timing 4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft 0121 5521
Valve diameter Intake 35 mm
Valve diameter Exhaust 30 mm
Valve clearence cold Intake 0,10 mm
Valve clearence cold
Exhaust
0,15 mm
Crank shaft bearing 2 cylinder roller bearing
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston alluminium alloy cast alluminium alloy forged
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication pressure circulation lubrication with two rotorpumps
Engine oil fullsynthetic oil (Shell Advance Ultra4 SAE 10W40)
Quantity of engine oil 1,25 liters
Primary ratio straight geared spur wheels 33:76 t
Clutch multi disc clutch in oil bath
Transmission claw shifted 6-speed 6-speed 6-speed 4-speed 6-speed 6-speed
Gear ratio
1
st
Gear 16:32 16:32 14:34 16:32 16:32 14:34
2
nd
Gear 18:30 18:30 17:31 18:30 18:30 17:31
3
rd
Gear 20:28 20:28 19:28 20:28 20:28 19:28
4
th
Gear 22:26 22:26 22:26 22:26 22:26 22:26
5
th
Gear 24:24 24:24 24:23 - 24:24 24:23
6
th
Gear 21:18 21:18 26:21 - 21:18 26:21
Ignition system contactless DC-CDI ignition with digital advanced system by KOKUSAN
Generator 12V 40W 12V 110W
Spark plug NGK CR8 EK
Spark plug gap 0,6 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1 liter, 40% antifreeze, 60% water, at least -25° (-13° F)
Starting equipment kickstarter kick - electric starter kickstarter kick - electric starter
TECHNICAL DATA – ENGINE 400/520 SX, MXC, EXC RACING 2002