CB650SC/Carbs: Difference between revisions

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===O-rings (closest nominal match)===
===O-rings (closest nominal match)===
{| class="wikitable"
{| class="wikitable"
!Desc. || I.D. || Thickness || O.D. || Qty. Needed
!Desc. || I.D. || Thickness || O.D. || Qty. Needed || Notes
|-
|-
!Small, (fuel tubes)
!Small, (fuel tubes)
| 5.9mm (-0.1)|| 1.8mm (=) || 9.5mm (-0.1) || x4
| 5.9mm (-0.1)|| 1.8mm (=) || 9.5mm (-0.1) || x4 || Might just work?
|-
|-
!Large, (fuel tee)
!Large, (fuel tee)
| 7mm (=) || 2mm (=) || 11mm (=) || x2
| 7mm (=) || 2mm (=) || 11mm (=) || x2 || Exact
|-
|-
!Thin, (breather tube tees)
!Thin, (breather tube tees)
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|-
|-
!Cly. head to boot couplings
!Cly. head to boot couplings
| 34.7mm (+1) || 2.65mm (+0.05) || 40mm (+1.1) || x8
| 34.7mm (+1) || 2.65mm (+0.05) || 40mm (+1.1) || x8 || Fine
|-
|-
!Air/fuel mixture screw
!Air/fuel mixture screw
| 3mm (+0.2)|| 1mm (-0.1) || 5mm (=) || x4
| 3mm (+0.2)|| 1mm (-0.1) || 5mm (=) || x4 || Not recommended
|-
|-
!"
!"
| 2.6mm (-0.2) || 1.2mm (+0.1) || 5mm (=) || "
| 2.6mm (-0.2) || 1.2mm (+0.1) || 5mm (=) || " || Best
|-
|-
!Washer included w/ above
!"
| 3mm || 1x0.5mm || 5mm || x4
| 3.1mm (+0.3) || 1.2mm (+0.1) || 5.5mm (+0.5) || " || Worse?
|-
!"
| 2.5mm (-0.3) || 1.5mm (+0.4) || 5.5mm (+0.5) || " || Tight
|}
|}


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{| class="wikitable"
{| class="wikitable"
!Part/Jet || Size || OEM P/N || Keyster P/N || Series || Length || Diameter (thread) || Diameter (head)
!Part/Jet || Size || OEM P/N || EBC P/N || Keyster P/N || Series || Length || Diameter (thread) || Diameter (head)
|-
|-
!Main
!Main
|#115 || 99101-393-1150 -> </br> 99101-GHB-1150 -> </br> 99101-MAZ-1150
|#115 || 99101-393-1150 -> </br> 99101-GHB-1150 -> </br> 99101-MAZ-1150
| KHM-110115 || 99101-393 or KR28 || 8mm || 4.9mm || 6mm
| KJ115 (KJ115-4 4-pk) || KHM-110115 || 99101-393 or KR28 || 8mm || 4.9mm || 6mm
|-
|-
!Slow
!Slow
|#35 || 99103-MA4-0350 -> </br> 99103-GY6-0350
|#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
| || 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
!Needle Holder
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|-
|-
!Needle Set</br>(Europe)
!Needle Set</br>(Europe)
| 79P (#D476) || 16012-ME5-611 || KHD-0476Z
| 79P (#D476) || 16012-ME5-611 || || KHD-0476Z
|-
|-
!Needle Set</br>(CB700SC/700S)
!Needle Set</br>(CB700SC/700S)
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|-
|-
!Idle Screw Set</br>(Europe)
!Idle Screw Set</br>(Europe)
| || 16016-MA6-003 || KHSS-138
| || 16016-MA6-003 || || KHSS-138
|-
|-
!Float valve
!Float valve
| || 16165-413-751 || KVN-16N00
| || 16165-413-751 || || KVN-16N00
|-
|-
!Needle Shims
!Needle Shims
| || || || || ID: 3.2mm || OD: 7mm || thickness: 0.5mm
| || || || || || ID: 3.2mm || OD: 7mm || thickness: 0.5mm
|}
|}


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|experimenting with different engine, air intake and exhaust system
|experimenting with different engine, air intake and exhaust system
|}
|}
==Carb Products==
* https://paceadventureworks.com/products/cb650sc-nighthawk-intake-ducts-1983-1985
* https://murrayscarbs.com/product/honda-nighthawk-650-cb650sc-carburetor-kit/

Latest revision as of 18:35, 18 August 2026

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 O.D. Number
Small, (fuel tubes) 6mm 1.8mm 9.6mm x4
Large, (fuel tee) 7mm 2mm 11mm x2
Thin, (breather tube tees) x4
Cly. head to boot couplings 91306-ME5-003 ->
91306-HA0-003		 33.7mm 2.6mm 38.9mm x8
Air/fuel mixture screw 16016-MAH-670
16075-GHB-600		 2.8mm 1.1mm 5mm x4
Washer included w/ above " 3mm 1x0.5mm 5mm x4

O-rings (closest nominal match)

Desc. I.D. Thickness O.D. Qty. Needed Notes
Small, (fuel tubes) 5.9mm (-0.1) 1.8mm (=) 9.5mm (-0.1) x4 Might just work?
Large, (fuel tee) 7mm (=) 2mm (=) 11mm (=) x2 Exact
Thin, (breather tube tees) mm mm mm x4
Cly. head to boot couplings 34.7mm (+1) 2.65mm (+0.05) 40mm (+1.1) x8 Fine
Air/fuel mixture screw 3mm (+0.2) 1mm (-0.1) 5mm (=) x4 Not recommended
" 2.6mm (-0.2) 1.2mm (+0.1) 5mm (=) " Best
" 3.1mm (+0.3) 1.2mm (+0.1) 5.5mm (+0.5) " Worse?
" 2.5mm (-0.3) 1.5mm (+0.4) 5.5mm (+0.5) " Tight

Carb Parts

Part/Jet Size OEM P/N EBC P/N Keyster P/N Series Length Diameter (thread) Diameter (head)
Main #115 99101-393-1150 ->
99101-GHB-1150 ->
99101-MAZ-1150 		KJ115 (KJ115-4 4-pk) 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

Carb Products

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