WT-644 Carburetor
WT-257 Big Bore Carburetor
WT-813 Big Bore Carburetor
Walbro WT-644 Carburetor
Venturi Bore: 12.7mm
Venturi Bore: 12.7mm
Venturi Bore: 12.7mm
Throttle Bore: 15.84mm
Throttle Bore: 15.84mm
Throttle Bore: 15.84mm
Primer Bulb: Yes
Primer Bulb: No
Primer Bulb: Yes
Choke: Yes
Choke: No
Choke: No
Mounting hole’s distance between centers: 31mm
Mounting hole’s distance between centers: 31mm
Mounting hole’s distance between centers: 31mm
Accelerator System: No
Accelerator System: No
Accelerator System: Yes
     
BZ2168
644 Carb
$39.95
BZ2025
WT-257 carb

$44.95
BZ2038
WT-813
$54.95

Starting point carburetor settings (High/Low)
WT-257 / WT-1027
WT-1048
WT-603 / WT-603B
WT-644
WT-813 / WT-813A
H – 1-1/4 turn
L – 2 turns
H – 1-1/4 turns
L – 2 turns
H – 1-5/8 turns
L – 1-3/8 turns
H – 1-5/8 turns
L – 1-3/8 turns
H – 1-5/8 turns
L – 1-3/8 turns

6 thoughts on “Carbs

  1. ck797875 says:

    WT-813A Carb vs WT-257 Carb?
    I’m still a little confused about which carb to go with on the high end marine engines.
    Are there certain issues with some carbs on the high output marine engines?
    What is the overall best performing carb to have on a modded engine and what are the differences?

    1. bonzi says:

      WT-813A has an accelerator pump which increases throttle response. When looking for every last possible advantage throttle response is important.
      WT-257/WT-1027 (same carb) is the go to choice for racers and carb upgrades.

  2. cemeena says:

    Includes: BONZI BZX4 RACE ENGINE: raised exhaust timing and enlarged exhaust port, port matched intake manifold, machined lightened and top relieved piston, two oil grooves for lubrication at high RPM, increased intake volume in jug, modified flow direction, jug base machined for increased compression, zero drag seals, Walbro WT-257 big bore carb, BONZI Very Cool Water Jacket, Stainless Hardware Kit and BONZI carb velocity stackand NGK CMR7H spark plug! SKU: BZ2103-4 Categories: Engine Accessories, Hardware Parts, Zenoah Engine Parts, Zenoah Engine Mods Tags: Bonzi, Custom, Parts, RC Boats, Remote Control, Toy Boat, Water Sports

  3. yorks338 says:

    Carb upgrade for pum30 what would you recommend thanks

    1. bonzi says:

      Walbro WT-257/WT-1027 – same carburetor. Good upgrade for Zenoah G300PUM.

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