CB650SC/Carbs: Difference between revisions

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Keihin VE54A
 
{| class="wikitable"
!Item
!Spec
!Note
|-
|Venturi || 29.2mm (1.15in) ||
|-
|Type || VE ||
|-
|Style || CV || (constant velocity)
|-
|Float || 18.5mm +/-1mm (0.61in +/-0.04in) || Non-adjustable
|-
|Idle || 1,100RPM +/-100RPM ||
|-
|Throttle grip free-play || 2-6mm (0.08-0.24in) ||
|-
|Fast Idle || 3,000RPM +/-500RPM || choke on
|-
|Needle marking || "79K" ||
|-
|Choke type || By-starter ||
|}
 
===O-rings===
{| class="wikitable"
!Desc. || Part Number || I.D. || Thickness || Number
|-
!Small, (fuel tubes)
| || 6mm || 1.8mm || 4x
|-
!Large, (fuel tee)
| || 7mm || 2mm || 2x
|-
!Thin, (breather tube tees)
| || || || 4x
|-
!Cly. head to boot couplings
|91306-ME5-003 -></br>91306-HA0-003 || 33.7mm || 2.6mm || 8x
|}
==Carb Parts==
* Keyster kit (N.A.): K-893HK (http://www.siriusconinc.com/products/detail/2685)
* Keyster kit (E.U.): KH-1195N (https://www.3pracing.com/en/keyster-carburetor-rebuild-kit-kh-1195n-for-honda-cbx-650-1983-1985.html)
 
{| class="wikitable"
!Part/Jet || Size || OEM P/N || Keyster P/N || Series || Length || Diameter (thread) || Diameter (head)
|-
!Main
|#115 || 99101-393-1150 -> </br> 99101-GHB-1150 -> </br> 99101-MAZ-1150
| KHM-110115 || 99101-393 or KR28 || 8mm || 4.9mm || 6mm
|-
!Slow
|#35 || 99103-MA4-0350 -> </br> 99103-GY6-0350
| KHS-29C035|| <s>N424-21(N424/21) or K26</s> N424-26(N424/26) || <s>28mm</s> 23.5mm || 5.9mm || 4.9mm
|-
!Needle Holder
| || 16165-449-771 ||
|-
!Needle Set</br>(Canada)
| 79K || 16012-ME5-621 -> </br> 16012-ME5-671 ||
|-
!Needle Set</br>(Europe)
| 79P (#D476) || 16012-ME5-611 || KHD-0476Z
|-
!Needle Set</br>(CB700SC/700S)
| 2SK || ||
|-
!Idle Screw Set
| || 16016-ME5-671 -> </br> 16016-KR3-671 -> </br> 16016-MY6-770 ||
|-
!Idle Screw Set</br>(Europe)
| || 16016-MA6-003 || KHSS-138
|-
!Float valve
| || 16165-413-751 || KVN-16N00
|-
!Needle Shims
| || || || || ID: 3.2mm || OD: 7mm || thickness: 0.5mm
|}
 
{| class="wikitable"
!Stage
!Main
!Slow
!Needle shims 0.5mm (per each carb)
!Note
|-
|0 (OEM)
|#115
|#35
|0
|Stock
|-
|1
|#118
|#35
|1
|stock engine and with stock air intake and stock exhaust system
|-
|2
|#120
|#38
|1
|stock or lightly modified engine with improved air intake using stock air intake box and baffled aftermarket exhaust or lightly modified exhaust
|-
|3
|#125
|#38
|2
|stock or lightly modified engines with individual air intakes and baffled aftermarket exhaust system
|-
|4
|#125
|#40
|2
|modified engines with individual air intakes and non-baffled exhaust system (racing use only)
|-
|5
|#130
|#40
|2
|
|-
|Pro
|#118, #120, #122, #125 and #128
|#38, #40
|2
|experimenting with different engine, air intake and exhaust system
|}

Latest revision as of 18:17, 12 August 2025

Keihin VE54A

Item Spec Note
Venturi 29.2mm (1.15in)
Type VE
Style CV (constant velocity)
Float 18.5mm +/-1mm (0.61in +/-0.04in) Non-adjustable
Idle 1,100RPM +/-100RPM
Throttle grip free-play 2-6mm (0.08-0.24in)
Fast Idle 3,000RPM +/-500RPM choke on
Needle marking "79K"
Choke type By-starter

O-rings

Desc. Part Number I.D. Thickness Number
Small, (fuel tubes) 6mm 1.8mm 4x
Large, (fuel tee) 7mm 2mm 2x
Thin, (breather tube tees) 4x
Cly. head to boot couplings 91306-ME5-003 ->
91306-HA0-003		 33.7mm 2.6mm 8x

Carb Parts

Part/Jet Size OEM P/N Keyster P/N Series Length Diameter (thread) Diameter (head)
Main #115 99101-393-1150 ->
99101-GHB-1150 ->
99101-MAZ-1150 		KHM-110115 99101-393 or KR28 8mm 4.9mm 6mm
Slow #35 99103-MA4-0350 ->
99103-GY6-0350 		KHS-29C035 N424-21(N424/21) or K26 N424-26(N424/26) 28mm 23.5mm 5.9mm 4.9mm
Needle Holder 16165-449-771
Needle Set
(Canada) 		79K 16012-ME5-621 ->
16012-ME5-671
Needle Set
(Europe) 		79P (#D476) 16012-ME5-611 KHD-0476Z
Needle Set
(CB700SC/700S) 		2SK
Idle Screw Set 16016-ME5-671 ->
16016-KR3-671 ->
16016-MY6-770
Idle Screw Set
(Europe) 		16016-MA6-003 KHSS-138
Float valve 16165-413-751 KVN-16N00
Needle Shims ID: 3.2mm OD: 7mm thickness: 0.5mm
Stage Main Slow Needle shims 0.5mm (per each carb) Note
0 (OEM) #115 #35 0 Stock
1 #118 #35 1 stock engine and with stock air intake and stock exhaust system
2 #120 #38 1 stock or lightly modified engine with improved air intake using stock air intake box and baffled aftermarket exhaust or lightly modified exhaust
3 #125 #38 2 stock or lightly modified engines with individual air intakes and baffled aftermarket exhaust system
4 #125 #40 2 modified engines with individual air intakes and non-baffled exhaust system (racing use only)
5 #130 #40 2
Pro #118, #120, #122, #125 and #128 #38, #40 2 experimenting with different engine, air intake and exhaust system
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