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Main Jets for Keihin Carburettor
Part Number
99101-357-***
The Keihin Main Jet mainly changes the mixture on full throttle openings but changing the size of the jet also affects the mixture throughout the the full throttle range.
The most popular size main jet for trials bikes in the UK is a 125, warmer climates or higher altitudes have less oxygen in the air so require smaller jets.
Fits CR, FCR, PJ, PWK, PWM, PE, PD Keihin Carbs.
6mm Hex head
M5 x 0.8 Thread
16.5mm Length
The number of the jet indicates the size of the hole (highest is the largest/richest). Too rich a mixture will limit the maximum engine speed, too lean a mixture will cause seizure so it is often best to stay slightly on the too rich side. Part numbers:
| Size | Keihin Part No | Sherco Part No | Beta Part No |
|---|---|---|---|
| 105 | 99101-357-105 | 1642301 000 | |
| 108 | 99101-357-108 | 1642303 000 | |
| 110 | 99101-357-110 | 1642305 000 | |
| 112 | 99101-357-112 | 1642302 000 | |
| 115 | 99101-357-115 | 1402 | 1642306 000 |
| 118 | 99101-357-118 | 1352 | 1642304 000 |
| 120 | 99101-357-120 | 1353 | 1642307 000 |
| 122 | 99101-357-122 | 1248 | 1642308 000 |
| 125 | 99101-357-125 | 1247 | 1642309 000 |
| 128 | 99101-357-128 | 1642310 000 | |
| 130 | 99101-357-130 | 1642311 000 | |
| 135 | 99101-357-135 | ||
| 140 | 99101-357-140 | ||
| 145 | 99101-357-145 | ||
| 148 | 99101-357-148 | ||
| 150 | 99101-357-150 | ||
| 152 | 99101-357-152 | ||
| 165 | 99101-357-165 | ||
| 168 | 99101-357-168 | ||
| 190 | 99101-357-190 | ||
| 195 | 99101-357-195 | ||
| 200 | 99101-357-200 | ||
| 205 | 99101-357-205 |
| Manufacturer | Keihin |
|---|---|
| Sherco Part Code | 1247, 1248, 1347, 1352, 1353, 1402 |
| Beta Part Code | 1642301 000, 1642303 000, 1642305 000, 1642302 000, 1642306 000, 1642304 000, 1642307 000, 1642308 000, 1642309 000, 1642310 000, 1642311 000 |
| Year | 2007, 2008, 2009 |
| Model | 320 |
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