As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.
There is no universal dirt-bike carburetor. Start with the exact motorcycle year, engine, OEM part number, intake-side and airboot diameters, cable/choke arrangement and jetting specification. The non-OEM models below are measurement-dependent alternatives, not promises of bolt-on fit.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Mikuni TMX38-59 38 mm Oval-Slide Carburetor | $430 | Amazon · eBay |
| 2 | Mikuni TMX35 Series Carburetor | $300–$450 | Amazon · eBay |
| 3 | Keihin PWK 28 mm Carburetor | $150–$250 | Amazon · eBay |
| 4 | Keihin PWK 30 mm Carburetor | $150–$260 | Amazon · eBay |
| 5 | Keihin PWK 33 mm Carburetor | $170–$280 | Amazon · eBay |
| 6 | Keihin PWK 36 mm Carburetor | $180–$300 | Amazon · eBay |
| 7 | Keihin PWK 38 mm Air Striker Carburetor | $200–$350 | Amazon · eBay |
| 8 | Mikuni VM26-8074 Round-Slide Carburetor | $110–$170 | Amazon · eBay |
| 9 | Mikuni TM34 Flat-Slide Carburetor | $250–$400 | Amazon · eBay |
The picks, in detail
Mikuni TMX38-59 38 mm Oval-Slide Carburetor
Genuine Mikuni 38 mm TMX, sold direct for 250 cc or larger race-engine applications; verify manifold, boot, cable and jetting before replacing an OEM unit.
- 38 mm bore
- oval slide
- independent float design
- direct Mikuni listing
- rough-terrain float design
- not a universal 250+ fit
Mikuni TMX35 Series Carburetor
A 35 mm TMX family size identified by Mikuni for 125 cc race-engine applications; application still depends on the bike’s original induction parts.
- 35 mm bore
- TMX oval-slide family
- race-engine size class
- maker identifies intended size class
- genuine Mikuni family
- requires exact part-number and jetting check
Keihin PWK 28 mm Carburetor
Measurement-dependent small two-stroke carburetor option; use only after confirming spigot dimensions, cable, choke, reeds and jetting.
- 28 mm venturi
- PWK family
- two-stroke application dependent
- common serviceable family
- multiple jet options
- not an OEM substitute without measurements
Keihin PWK 30 mm Carburetor
Measurement-dependent PWK size for engines whose original carburetor and intake dimensions support a 30 mm bore.
- 30 mm venturi
- PWK family
- jetting required
- common aftermarket family
- parts availability
- engine and intake match required
Keihin PWK 33 mm Carburetor
A mid-size PWK alternative only after comparing the original carb’s spigots, cable and jetting; do not choose by engine displacement alone.
- 33 mm venturi
- PWK family
- measurement-dependent
- known performance-carb family
- tunable
- no universal dirt-bike fit
Keihin PWK 36 mm Carburetor
A 36 mm PWK size used in specific two-stroke conversions and OEM applications, but it needs a bike-specific cable, intake and jetting match.
- 36 mm venturi
- PWK family
- two-stroke application dependent
- well-known flat-slide family
- replacement parts available
- fitment must be measured
Keihin PWK 38 mm Air Striker Carburetor
A 38 mm PWK variant for specific larger two-stroke applications; use a model-specific kit or confirm every intake, cable and jetting interface.
- 38 mm venturi
- PWK Air Striker family
- flat-slide layout
- established two-stroke conversion family
- tunable circuit design
- near-miss swaps create fitment problems
Mikuni VM26-8074 Round-Slide Carburetor
A 26 mm VM round-slide carburetor for measurement-matched small-engine applications, not an automatic fit for every pit bike or trail bike.
- 26 mm bore
- round slide
- spigot measurement required
- genuine Mikuni VM family
- simple service layout
- jetting and cable must match
Mikuni TM34 Flat-Slide Carburetor
A 34 mm TM flat-slide option for engines with verified matching intake dimensions and a realistic jetting plan.
- 34 mm bore
- flat slide
- measurement-dependent fit
- genuine Mikuni TM family
- flat-slide response design
- not bike-specific without kit
Buying tips
- Order an OEM replacement by VIN/model year and part number whenever the original configuration is known.
- Measure both intake and airboot inside diameters, cable free length, choke style and fuel-inlet orientation before selecting an alternative.
- A carburetor change requires safe jetting and leak checks; do not ride until throttle return, fuel sealing and engine response are verified.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.