== carb ID# ============ M O P E D S ===========
1. 50A, 50B– 1966-67 Honda P25 xxxxxxxxxxxx 40 kmh OHC
1. 50A, 50B– 1967-68 Honda P50 xxxxxxxxxxxx 40 kmh OHC
1. 50A-610 1967-68 Honda P50 Little Honda 40 kmh OHC
2. C4B, C5B 1969-70 Honda PC50A xxxxxxx 40,50 kmh OHC
2. C5A, C5A 1969-70 Honda PC50 Little Honda 40 kmh OHC
2. S4A, S5A 1969-70 Honda PS50 xxxxooo x 40,50 kmh OHC
2. F4A, F5A 1970-73 Honda PC50K1, PF50 x 40,50 kmh OHV
2. S4B, S5B 1970-71 Honda PS50 xxxxxxxxooo 50 kmh OHV
1. Keihin
carb model frame number range models
50A-000 044 P25-A000001-00000 ’66-67 P25 16100-044-315
50A-000 044 P50-100001-128650 ’67-68 P50, P50 export 16100-044-681
50B-000 044 P50-128651-148606 ’67-68 P50 (US) 16100-044-405
50B-000 044 P50-128651-148606 ’67-68 P50 export 16100-044-691
50B-000 044 P50-148607-000000 ’68-68 P50 (US) 16100-044-683
1. 1964 P25 (NL model), 2. 1967 Honda P50, 3. 1968 P50 (US model)
Bore: 42.0 mm, stroke 35.6 mm, displacement: 49.3 cc. P50’s have down-draft carburetors, unusual.
50B carbs do not have a replaceable float valve. It’s part of, and only sold with, the float chamber cover.
50B has a larger carb size ∅11? and jet #68 or 62. 50A has a smaller carb size ∅9? and jet #60 or 55.
1. #0 16010-044-004, 2. #1 16010-044-680
A# a6nb B# price a. 50A, 6. 50B-610, n. 50B-NL, b. 50B
00 1000 00 N/A 16100-044-315 carburetor 50A-000 P25
00 0100 70 N/A 16100-044-405 carburetor 50B-610 P50, P50 (US)
00 0010 00 N/A 16100-044-681 carburetor 50A-NL P50
00 0001 70 N/A 16100-044-683 carburetor 50B-000 P50, P50 (US)
00 1000 00 N/A 16010-044-004 gasket set 4 12 13 15 3×20 24 27 32
12 1000 00 N/A 16173-001-004 rubber seal ring
13 1000 00 N/A 16188-044-004 valve fiber washer 7.2 x 10.5
24 1000 00 N/A 16123-044-004 jet access gasket
32 1000 00 N/A (not sold separately) choke shaft o-ring
00 0111 1 $14 16010-044-680 gasket set 4-piece 4 15 20 27
27 1111 1n 0$2 16174-044-004 float o-ring 1.5 x 40 (43od)
04 1111 1p 0$5 16171-044-004 top rubber washer 10 x 15 x 1
15 1111 1r 0$5 16175-001-004 needle jet o-ring 2 x 4 (8od)
20 3333 1i 0$2 16175-260-004 jet/screw o-ring 2 x 2.5 (6.5od)
00 0111 02 N/A 16012-044-681 needle set 2a 2b 2c 2d
06 1111 2a 0$5 16156-044-004 throttle w-clip
07 1111 2b 0$2 16157-044-004 needle e-clip 1.5 for 2.0 needle
08 1001 00 N/A 16151-044-681 jet needle
00 0111 2c N/A 16151-044-683 jet needle
16 1000 00 N/A 16133-044-004 needle jet
16 0100 00 N/A 16133-044-681 needle jet 2.6 x 1.55
00 0011 2d N/A 16133-044-683 needle jet 2.6 x 2.0
00 1111 03 N/A 16014-044-004 top set 3a 3b 1p
03 1111 3a N/A 16119-044-004 carb top M16-1.0
02 1111 3b 0$3 16118-044-004 cable adjuster male M6-0.75
11 1000 00 N/A 16125-044-004 float valve set .
00 0111 04 N/A 16015-044-014 chamber/valve set 4a 1n
00 0111 4a N/A 16112-044-014 chamber cover w/valve .
26 1000 00 N/A 16112-044-004 float chamber cover
00 1111 05 N/A 16016-044-014 screw set 5a 5b 5c 5d 1i 1i
18 1111 5a N/A 16163-044-014 idle speed screw
19 1111 5b N/A 16162-259-004 idle air screw
21 1111 5c N/A 16182-011-004 idle speed spring
22 1111 5d N/A 16181-202-004 idle air spring
00 0111 06 N/A 16022-044-680 valve (slide) set 6a 6b
09 1111 6a N/A 16141-044-683 throttle valve (slide)
05 1111 6b N/A 16185-044-004 throttle spring
28 1000 00 N/A 16122-044-004 float
00 0111 08 N/A 16122-044-014 float from #A148607
01 1111 09 N/A 16194-044-004 cable boot
30 4000 00 0$1 93600-04008 bowl screw M4 x 8 sunk-phil
00 0222 10 .80 00-93500-03008 bowl screw M3 x 8 phil
00 0111 11 0$1 93500-04008 screw M4 x 8 phil
00 0111 12 .70 94111-03000 bowl lock washer M3
25 1000 00 N/A 99120-06014 main jet 60
25 0100 00 N/A 99120-05514 main jet 55
00 0010 13 N/A 99114-044-0681 main jet 68
00 0001 13 N/A 99120-06214 main jet 62
17 1000 00 N/A 99144-03804 slow jet 38
17 0100 00 N/A 99144-03504 slow jet 35
00 0010 14 N/A 99203-044-5201 slow jet
00 0001 14 N/A 99203-044-0351 slow jet
Part Sets: Before 1968 most Honda parts were sold individually. That is how 50A is listed and illustrated. Starting in 1968, many Honda parts were only sold in sets. That is how 50B is listed and illustrated.
2. Keihin
size carb model code eng years frame number range Honda models
0∅9 C4A on #063 ohc 1969-70 PC50-1000000 to 1057917 PC50 xxxxxx40 km/h
∅10 C5A on #063 ohc 1969-70 PC50-1057918 to 1060412 PC50 (1306302) 50 km
∅10 C5A on #063 ohc 1969-70 PC50-1060413 to 0000000 PC50 Little Honda (US)
∅10 C5A on #064 ohc 1969-70 PS50-1000000 to 1001412 PS50 xxxxxx50 km/h
∅10 S5A on #064 ohc 1969-70 PS50-1001413 to 0000000 PS50 xxxxxx50 km/h
0∅9 C4B on #081 ohv 1970-71 PC50-2000000 to 2039616 PC50K1 xxxx40 km/h
∅10 C5B on #081 ohv 1970-71 PC50-2039617 to 0000000 PC50K1 xxxx50 km/h
∅10 S5B on #082 ohv 1970-71 PS50-2000000 to 0000000 PS50K1 xxxx50 km/h
0∅9 F4A on #081 ohv 1971-73 PC50-0000000 to 0000000 PC50K1 xxxx40 km/h
∅9 o F4A on #099 ohv 1970-73 PF50-1000000 to 0000000 PF50 Amigo 40 km/h
∅10 F5A on #081 ohv 1971-73 PC50-0000000 to 0000000 PC50K1 xxxx50 km/h
∅10 F5A on #099 ohv 1970-73 PF50-1000000 to 0000000 PF50 Amigo 50 km/h
1968 PC50A (Euro)
with OHC engine
1969-70 PC50 (USA) with OHC engine
1973 Honda PC50K1
with OHV engine
1969-70 PC50: Before April 1970, the PC50 had a OHC engine (over head cam). Bore 42.0 mm, stroke 35.6 mm, displacement 49.3 cc. The valves were operated by a cam in the head, driven by a cam chain.
Spigot mount: The Keihin C4A, C5A, C4B, C5B carburetors for the early 1969-70 PC50A were spigot mount type. They had a round float bowl gasket (with three flat sides when installed), a push-in jet, jet pad, completely round “donut” float, all metal float needle with replaceable float seat.
1970-73 PC50K1: After April 1970, the PC50K1 had a OHV engine (over head valve). The valves were operated by pushrods from a cam down in the case.
Flange mount: The Keihin F4A, F5A, carburetors for the 1970-73 PC50K1 were flange mount type with 32mm bolt spacing. There was a diamond shaped gasket rather than an o-ring like all later flange mount carbs. Everything else was the same, round float bowl gasket (with three flat sides when installed), a push-in jet, jet pad, completely round “donut” float, all metal float needle with replaceable float seat.
Keihin C5A carburetor
Keihin F4A carburetor
#1 16010-063-000
1d 1e 1n 1p 1r
#1 16010-063-004
1d 1e 1n 1p 1q .
#1 16010-114-305
1d 1e 1n 1p 1r 1v
0o quantity
o# ⇓⇓⇓⇓⇓⇓ Keihin (a)C4A (b)C5A (c)C4B (d)C5B (e)F4A (f)F5A
o# abcdef price Honda part# description specs
00 100000 N/A 16100-063-690 carb. C4A ∅9 69-70 PC50
00 010000 N/A 16100-063-004 carb. C5A ∅10 69-70 PC50, PS50
00 001000 N/A 16100-081-690 carb. C4B ∅9 70 PC50K1 < 2039617
00 000100 N/A 16100-081-014 carb. C5B ∅10 70 PC50K1 > 2039616
00 000010 N/A 16100-099-690 carb. F4A ∅9 70-73 PC50K1, PF50
00 000001 N/A 16100-099-600 carb. F5A ∅10 70-73 PC50K1, PF50
01 111011 $30 16010-063-004 gasket solo-set 1d 1e 1n 1p 1q
01 000100 $34 16010-063-000 gasket solo-set 1d 1e 1n 1p oo 1r
01 111111 $34 16010-114-305 gasket multi-set 1d 1e 1n 1p 1q 1r
1d 111111 0$2 16176-551-004 main jet o-ring 1 x 3 (5 od)
1e 111111 $14 16197-063-004 jet pad disk Ø7.5 x 1.0
1n 111111 0$3 16173-063-004 float bowl o-ring 1.5 x 40 (43 od)
1p 111111 0$5 16171-044-004 top rubber washer 10 x 15 x 1
1q 111011 0$8 16189-056-004 drain screw seal washer 6 x 8 x 0.5
1r 000100 0$5 16175-001-004 drain screw o-ring C5B 2 x 4 (8od)
02 001101 N/A 16012-064-004 needle set F5A 2a 2c 2d 2f
2a 111101 N/A 16051-063-004 jet needle C4A C5A C4B C5B F5A
2b 000010 N/A 16051-063-690 jet needle F4A
2c 111111 0$5 16156-044-004 needle w-clip
2d 111111 0$2 16157-044-004 needle e-clip 1.5 for 2.0 needle
2e 110000 N/A 16133-063-004 needle jet C4A C5A 2.1 x 2.5
2f 001101 N/A 16133-081-004 needle jet C4B C5B F5A
2g 000010 N/A 16133-081-690 needle jet F4A
03 111111 N/A 16013-064-004 float set 3a 3b 3c 3d 3e 10
3a 111111 $13 16123-063-004 float needle (all metal)
3b 111111 N/A 16122-063-004 float
3c 111111 N/A 16127-063-014 float arm
3d 111111 N/A 16126-063-014 float hinge pin
3e 111111 N/A 16196-063-014 float pin plate
04 111111 N/A 16014-064-004 top set 4a 4b 1p
4a 111111 N/A 16119-063-004 top with pipe
4b 111111 N/A 16118-045-004 cable adjuster female M6-0.75
05 111011 N/A 16015-064-004 chamber set 5a 5c 1n 1q
05 000100 N/A 00000-000-000 chamber set 5b 5d 1n 1r
5a 111011 N/A (not sold separately) chamber bare
5b 000100 N/A (not sold separately) chamber bare
5c 111011 N/A 16164-225-004 drain screw C4A C5A C4B F4A F5A
5d 000100 N/A 16162-304-004 drain screw C5B
06 111111 N/A 16016-063-004 adjustment screw set
6a 111111 N/A 16163-063-014 idle speed screw
6b 111111 N/A 16162-044-004 idle air screw & spring
6c 111111 N/A 16181-250-004 idle speed spring
07 111111 N/A 16022-063-004 throttle valve set
7a 111111 N/A 16141-063-004 throttle valve (slide)
7b 111111 N/A 16185-044-004 throttle spring
09 111111 N/A 16194-063-004 cable pipe cover
10 222222 $1.00 93500-0300500A phillips screw M3 x 5
11 222222 $1.00 93500-040120A phillips screw M4 x 12
12 111111 $0.50 94111-030000 spring washer M3
13 222222 $0.20 94111-04000 spring washer M4
15 101010 N/A 99201-063-0550 main jet #55 push-in see jets below
15 010101 N/A 99201-063-0620 main jet #62 push-in see jets below
18 111111 N/A (not sold separately) idle jet press-in tube 0.35=0.0138″
Keyster 0605 kit for PC50A has no #1e
for C4A except no 1e, C5A except 15 1e
for C4B except 2f 1e, C5B except 2f 15 1e
for F4A except 2g 1e, F5A except 2f 15 1e
#5c #5d drain plugs
Zenith 11-HL on 1970’s Spanish Honda PS50
1970 Honda PS50