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Online store run by Xpert Moto
Local pickup available for pre-orders only
On-site installation at our Lewisham workshop
Online store run by Xpert Moto
Local pickup available for pre-orders only
On-site installation at our Lewisham workshop
Online store run by Xpert Moto
Local pickup available for pre-orders only
On-site installation at our Lewisham workshop
Online store run by Xpert Moto
Local pickup available for pre-orders only
On-site installation at our Lewisham workshop
Call us at: 0433 880 748
Free shipping over $200 (excludes tyres and bulky items)
Need help? book@xpertmotogear.com.au
Explore related collections:
- ➔ Carburetors and tuning (1262 products)
- ➔ Carburetor jet kits (187 products)
The Keihin Pilot Jet #38 is a direct-fit replacement slow jet for Keihin FCR-MX flat-slide carburettors, sold in a pack of four. Pilot jets govern fuel delivery at closed to quarter-throttle openings, making them the primary tuning lever for idle quality, low-speed response and choke-off cold starting.
Suited to motocross, enduro and off-road riders who are re-jetting for altitude, temperature changes or engine modifications, this pack provides multiple jets so you can work through a jetting sequence without waiting on individual orders.
- Size #38 pilot jet sized for Keihin FCR-MX flat-slide carburettors
- Controls fuel delivery from closed throttle to approximately quarter throttle
- Pack of 4 jets — sufficient for a full jetting sequence without reordering
- Direct OEM Keihin replacement part
- Precise orifice sizing for consistent, repeatable jetting results
- 4 x Keihin Pilot Jet #38 (FCR-MX)
| Brand | Keihin |
|---|---|
| Part Type | Pilot Jet (Slow Jet) |
| Jet Size | #38 |
| Compatible Carburettor | Keihin FCR-MX |
| Pack Quantity | 4 |
| SKU | 68-350-380 |
- Remove the carburettor float bowl to access the pilot jet; use a correctly sized flat-blade screwdriver — an ill-fitting tip will damage the jet's brass slot.
- Thread the jet in by hand first to avoid cross-threading the aluminium carburettor body, then snug lightly; do not overtighten.
- Blow compressed air through a removed jet to clear blockages; never use wire or a drill bit, as enlarging the orifice even slightly changes the jetting characteristic permanently.
- If idle quality or low-speed response degrades after cleaning, inspect the jet orifice under good light for wear or debris before replacing.
- When tuning for altitude or temperature, move one jet size at a time and test between changes — the #38 is one step in a range, and a rich or lean condition at idle is often resolved with a single size change.
- Store unused jets in a sealed container away from moisture; corrosion inside the orifice will alter flow and introduce inconsistent running.
- Always re-check and re-set idle mixture screw position after changing pilot jet size, as the two are interdependent.
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