CB650SC/Carbs
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
- 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)
| 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 | 5.9mm | 4.9mm | ||
| Needle Holder | 16165-449-771 | ||||||
| Needle Set (Canada) |
79K | 16012-ME5-621 -> 16012-ME5-671 |
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| 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 |
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| 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 |