Carbs

WT-644 Carburetor

WT-257 Big Bore Carburetor

WT-813 Big Bore Carburetor

Venturi Bore: 12.7mm

Throttle Bore: 15.84mm

Primer Bulb: Yes

Primer Bulb: No

Primer Bulb: Yes

Choke: Yes

Choke: No

Mounting hole’s distance between centers: 31mm

Accelerator System: No

Accelerator System: Yes

BZ2168

$39.95

BZ2025

$44.95

BZ2038

$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”

ck797875 says:

November 22, 2020 at 11:59 am

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?

bonzi says:

February 20, 2024 at 10:17 am

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.

cemeena says:

October 13, 2020 at 4:53 pm

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