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) | ||
| Line 62: | Line 62: | ||
|- | |- | ||
!Cly. head to boot couplings | !Cly. head to boot couplings | ||
| | | 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 | ||
|- | |- | ||
! | !" | ||
| | | 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 | |||
|} | |} | ||
Latest revision as of 01:03, 30 June 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
- 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 |
|||||
| 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 |