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NSR250R Stock Jetting Tables.
NSR250R
Stock Jetting Tables.
These are the official OEM base settings for all NSR250Rs.
Note:
The following tables are official Honda stock settings for factory restricted bikes. There are no official “derestricted” settings, as the NSR250R was only ever officially sold as a JDM [Japan Domestic Market] model, and therefore subject to power output restrictions.
Base settings are for the MC16. Where settings are unchanged, use the data from the preceding model.
MC16
| Venturi Diameter | 28mm | |
| Type | TA10A | |
| Float Height | 13mm | |
| Main Jet | #110 | |
| Slow Jet | #38 | |
| Needle | No.1 2QY | No.2 2QZ |
| Idle Speed | 1200 ± 100rpm | |
| Throttle Free Play | 2~6mm | |
| Air Screw Position | 1½ Turns out from fully closed | |
MC18 R2J/R4J [Mk1]
| Venturi Diameter | 32mm | |
| Type | TA20A | |
| Main Jet | No.1 #130 | No.2 #132 |
| Needle | No.1 BPD | No.2 BPE |
| Power Jet | No.1 #75 | No.2 #70 |
| Air Screw Position | 2⅜ Turns out from fully closed | |
MC18 R5K/R6K [Mk2]
| Type | TA21A | |
| Main Jet | #128 | |
| Needle | No.1 BPG | No.2 BPH |
| Power Jet | #75 | |
| Air Screw Position | 2⅛ Turns out from fully closed | |
MC21
| Type | TA22 | *TA22B |
| Main Jet | #128 | |
| Slow Jet | #38 | |
| Power Jet | No.1 #72 | No.2 #75 |
| Needle | No.1 J81E / No.2 2QZ | No.1 *J3LB / No.2 *J3LC |
| Idle Speed | 1250 ± 100rpm | |
| Air Screw Position | 1⅝ | *1½ |
MC28
| Type | TB10A | *TB10B |
| Main Jet | #140 | |
| Slow Jet | #38 | |
| Needle | 16135-KV3-950 | 16131-KV3-950 |
| Idle Speed | 1250 ± 100rpm | |
| Air Screw Position | No data available | |