First… where can I get an 11mm walbro for a good price, and what is it’s part number. I’ve been looking on eBay, and either I find carbs that are too small, too big, or I can’t find any data for the part number given.

Second… since these are “Pump” carbs… can I take one of my 9mm carbs and run an 11mm drill threw the venturi to open it up? Will it still have enough vacuum to run correctly?

Thanks in advance

I had a chainsaw with a boared out carb.

It had a different butterfly in it to make it work.

Zama Carburetors

C1U-K19, No choke, Primer, 2 needle, Echo, J/D 21C, 21S
C1U-K20, A-C, No Choke, Primer, 2 needle, Echo, SRM-2501/2501S, SRM-2510
C1U-K21, No Choke, Primer, 2 needle, Echo, SRM-3000, J/D 30S
C1U-K21A-B, No Choke, Primer, 2 Needle, Echo, SRM-3000, J/D 30S
C1U-K22,A, No Choke, Primer, 2 Needle, Echo, J/D 38B, SRM3800
C1U-K23, No Choke, Primer, 2 Needle
C1U-K23A-B, No Choke, Primer, 2 Needle, Lesco, LST24501/LHE2475
C1U-K34, No Choke, Primer, 2 Needle, Echo, SHR-2100
C1U-K34A, No Choke, Primer, 2 Needle, Echo, SHR-2100

C1Q-E3, No Choke, Primer, 2 Needle, Efco, Jet 300,400
C1Q-E4, No Choke, Primer, 2 Needle, Efco, Jet 300,400
C1Q-E6, No Choke, Primer, 2 Needle, Efco, EFCO 8742

C1Q-H17D, Choke, No Primer, 2 Needle, Homelite/JohnDeer, 200 Chain Saw
C1Q-H35, Choke, No Primer, 2 Needle, Homelite/JohnDeer, 33-38cc Chain Saw
C1Q-H42, Choke, No Primer, 2 Needle, Homelite/JohnDeer, 33-38cc Saw
C1Q-H43, Choke, No Primer, 2 Needle, Homelite/JohnDeer, 33-38cc Saw Non Em

C1Q-M27-C, Choke, No Primer, 2 Needle, McCulloch/Jenn Feng, 32cc Chain Saw
C1Q-M27D, Choke, No Primer, 2 Needle, McCulloch/Jenn Feng, 32cc Chain Saw
C1Q-M28-C, Choke, No Primer, 2 Needle, McCulloch/Jenn Feng, 35cc Chain Saw
C1Q-M28D, Choke, No Primer, 2 Needle, McCulloch/Jenn Feng, 35cc Chain Saw

C1Q-S44,A, No Choke, Primer, No Needles, Stihl, FC55 FS46 FS55 HL45
C1Q-S45, No Choke, Primer, No Needles, Stihl, FC85 FH75 FC75 HT75 HL75 S75/80/85 HT70/75 KW85
C1Q-S49,A, No Choke, Primer, No Needles, Stihl, HS45
C1Q-S49B, No Choke, Primer, No Needles, Stihl, HS45
C1Q-S50, No Choke, Primer, No Needles, Stihl, BG55/65/85 SH55/85
C1Q-S53,A, No Choke, Primer, No Needles, Stihl, FS46 FS55 HL45
C1Q-S54, No Choke, Primer, No Needles, Stihl, 4228
C1Q-S55, No Choke, Primer, No Needles, Stihl, BG55/65/85 SH55/85
C1Q-S56, No Choke, Primer, No Needles, Stihl, FH75 FC75 HT75 HL75 FS75/80/85 HT70/75 KW85
C1Q-S58, No Choke, Primer, No Needles, Stihl, FS55
C1Q-S60, No Choke, Primer, No Needles, Stihl, 25 CC ST / Brazil
C1Q-S62, No Choke, Primer, No Needles, Stihl, 4140 CA Version
C1Q-S63,A, No Choke, Primer, 2 Needles, Stihl, FS75/80/85 HT70/75
C1Q-S64, No Choke, Primer, 2 Needles, Stihl, BG45/46/55 SH55/85
C1Q-S66, No Choke, Primer, 2 Needles, Stihl, EMU ST FS45/46/55
C1Q-S67, No Choke, Primer, 2 Needles, Stihl, 4228 EMU HS45
C1Q-S68, No Choke, Primer, 2 Needles, Stihl, 4229 BG85 Blower
C1Q-S68A, No Choke, Primer, 2 Needles, Stihl, 4229 BG85 Blower
C1Q-S69A, No Choke, Primer, 2 Needles, Stihl, 4137 EMU Trimmer
C1Q-S70, No Choke, Primer, 2 Needles, Stihl, HS45 Hedgetrimmer
C1Q-S71, No Choke, Primer 2 Needles, Stihl, 4140 FS55 Trimmer
C1Q-S74,A, No Choke, Primer, 2 Needles, Stihl, 4314 BT45 Drill
C1Q-S79, No Choke, Primer, 2 Needles, Stihl, 4610 EMU Minni-Tiller
C1Q-S95, No Choke, Primer, 2 Needles, Stihl, FS38 Stringtrimmer

C1Q-SK8, No Choke, Primer, 2 Needles, Yanmar Brushcutter, Honda B.C./S.T., Shibaura M35D
C1Q-SK9, No Choke, Primer, 2 Needles, Lesco B.C./S.T., Shibaura M35D

C1Q-W14, Choke, No Primer, 2 Needles, Poulan/Weedeater, 36/42 LE CSI Non AV Saw
C1Q-W14A, Choke, No Primer, 2 Needles, Poulan/Weedeater, 36/42 LE CSI Non AV Saw
C1Q-W2A, No Choke, No Primer, 2 Needles, Poulan/Weedeater, Super 25 Chain Saw
C1Q-W8, Choke, No Primer, 2 Needles, Poulan/Weedeater, Wood Shark Chain Saw, Patriot 1900 Saw
C1Q-W9, Choke, No Primer, 2 Needles, Poulan/Weedeater, Sears 2.6 18" LS Saw, Poulan 2250 LE 18", Poulan Pro 221 16" LE CA, Poulan Pro 260 18" LE CA, Poulan Pro 2250 18" LE CA
C1Q-W9A, Choke, No Primer, 2 Needles, Poulan/Weedeater, Sears 2.6 18" LS Saw, Poulan 2250 LE 18", Poulan Pro 221 16" LE CA, Poulan Pro 260 18" LE CA, Poulan Pro 2250 18" LE CA

Walbro Carburetors

11.11mm
WT-105-1, No Choke, No Primer, 1 Needle (no low speed)
WT-108-1, No Choke, No Primer, 2 Needles
WT-130-1, No Choke, No Primer, 2 Needles
WT-131-1, No Choke, No Primer, 2 Needles
WT-139-1, No Choke, Primer, 2 Needles
WT-144-1, No Choke, No Primer, 2 Needles
WT-145-1, No Choke, Primer, 2 Needles
WT-146-1, No Choke, No Primer, 2 Needles
WT-214-1, Choke, No Primer, 2 Needles
WT-239-1, Choke, No Primer, 2 Needles
WT-243-1, Primer, No Choke, 2 Needles
WT-249-1, Choke, No Primer, 2 Needles
WT-250-1, No Choke, No Primer, 2 Needles
WT-252-1, No Choke, No Primer, 1 Needle (no high speed)
WT-258-1, Choke, No Primer, 2 Needles
WT-261-1, No Choke, No Primer, 2 Needles
WT-265-1, No Choke, Primer, 2 Needles
WT-271-1, No Choke, No Primer, 2 Needles
WT-289-1, Choke, No Primer, 2 Needles
WT-29-1, No Choke, No Primer, 2 Needles
WT-297-1, No Choke, Primer, 2 Needles
WT-301-1, No Choke, No Primer, 2 Needles
WT-323-1, No Choke, No Primer, 1 Needle (no high speed)
WT-324-1, Choke, No Primer, 2 Needles
WT-337-1, No Choke, No Primer, 2 Needles
WT-347-1, Choke, No Primer, 2 Needles
WT-348-1, Choke, No Primer, 2 Needles
WT-350-1, Choke, No Primer, 2 Needles
WT-356-1, No Choke, No Primer, 2 Needles
WT-358-1, No Choke, No Primer, 2 Needles
WT-378-1, Choke, No Primer, 2 Needles
WT-382-1, No Choke, No Primer, 1 Needle (no high speed)
WT-391-1, Choke, No Primer, 2 Needles
WT-40-1, No Choke, Primer, 2 Needles
WT-404-1, No Choke, Primer, 2 Needles
WT-407-1, No Choke, No Primer, 2 Needles
WT-410-1, No Choke, No Primer, 2 Needles
WT-415-1, No Choke, Primer, 2 Needles
WT-42-1, No Choke, No Primer, 2 Needles
WT-433-1, Choke, No Primer, 2 Needles
WT-437-1, Choke, No Primer, 2 Needles
WT-438-1, Choke, No Primer, 2 Needles
WT-462-1, No Choke, Primer, 2 Needles
WT-464-1, No Choke, No Primer, 2 Needles
WT-47-1, No Choke, No Primer, 2 Needles
WT-478-1, No Choke, No Primer, 2 Needles
WT-499-1, No Choke, No Primer, 2 Needles
WT-504-1, Choke, No Primer, 2 Needles
WT-511-1, No Choke, No Primer, 2 Needles
WT-516-1, No Choke, No Primer, 2 Needles
WT-517-1, No Choke, Primer, 2 Needles
WT-518-1, Choke, No Primer, 2 Needles
WT-522-1, Choke, No Primer, 2 Needles
WT-524-1, No Choke, Primer, 2 Needles
WT-527-1, No Choke, No Primer, 2 Needles
WT-530-1, No Choke, No Primer, 2 Needles
WT-534-1, Choke, Primer, 2 Needles
WT-551-1, No Choke, Primer, 2 Needles
WT-553-1, No Choke, Primer, 2 Needles
WT-563-1, No Choke, No Primer, 1 Needle (no high speed)
WT-568-1, Choke, No Primer, 2 Needles
WT-569-1, Choke, No Primer, 2 Needles
WT-572-1, Choke, No Primer, 2 Needles
WT-576-1, Choke, No Primer 2 Needles
WT-588-1, Choke, No Primer, 2 Needles
WT-613-1, No Choke, Primer, 2 Needles
WT-624-1, Choke, No Primer, 2 Needles
WT-625-1, Choke, No Primer, 1 Needle (no high speed)
WT-626-1, Choke, Primer, No Needles
WT-627-1, Choke, No Primer, 1 Needle (no high speed)
WT-628-1, Choke, No Primer, No Needles
WT-629-1, No Choke, No Primer, 1 Needle (no high speed)
WT-630-1, Choke, Primer, 1 Needle (no high speed)
WT-631-1, No Choke, Primer, 1 Needle (no high speed)
WT-634-1, Choke, No Primer, 1 Needle (no high speed)
WT-642-1, Choke, No Primer, 2 Needles
WT-662-1, Choke, No Primer, 2 Needles
WT-669-1, Choke, No Primer, No Needles
WT-678-1, Choke, No Primer, 2 Needles
WT-684-1, No Choke, No Primer, 1 Needle (no high speed)
WT-689-1, Choke, No Primer, 2 Needles
WT-690-1, Choke, No Primer, 2 Needles
WT-695-1, Choke, No Primer, No Needles
WT-698-1, Choke, No Primer, No Needles
WT-700-1, Choke, No Primer, 2 Needles
WT-702-1, Choke, No Primer, 2 Needles
WT-707-1, Choke, No Primer, 2 Needles
WT-709-1, Choke, No Primer, 2 Needles
WT-718-1, Choke, No Primer, no needles
WT-72-1, No Choke, Primer, 2 Needles
WT-729-1, Choke, No Primer, 2 Needles
WT-74-1, No Choke, No Primer, 2 Needles
WT-77-1, No Choke, No Primer, 2 Needles
WT-86-1, Choke, No Primer, 2 Needles
WT-88-1, Choke, No Primer, 2 Needles
WT-94-1, No Choke, No Primer, 2 Needles

11.11mm
WTA-12-1, Choke, No Primer, 1 Needle (no high speed)
WTA-13-1, Choke, NO Primer, 1 Needle (no high speed)
WTA-14-1, No Choke, No Primer, 1 Needle (no high speed)
WTA-15-1, No Choke, No Primer, 1 Needle (no high speed)
WTA-2-1, Choke, No Primer, 1 Needle (no low speed)
WTA-3-1, Choke, No Primer, 1 Needle (no high speed)
WTA-4-1, Choke, no Primer, 1 Needle (no high speed)
WTA-5-1, Choke, no Primer, 1 Needle (no high speed)
WTA-6-1, No Choke, No Primer, 2 Needle
WTA-7-1, No Choke, no Primer, 2 Needle
WTA-9-1, Choke, no Primer, 1 Needle (no high speed)

11.11mm
WA-137-1, No Choke, No Primer, 2 Needles
WA-138-1, No Choke, No Primer, 2 Needles
WA-144-1, No Choke, No Primer, 2 Neesles
WA-150-1, No Choke, Primer, 2 Needles
WA-154-1, No Choke, Primer, 2 Needles
WA-162-1, No Choke, No Primer, 2 Needles
WA-166-1, No Choke, No Primer, 2 Needles
WA-167-1, No Choke, Primer, 2 Needles
WA-173-1, No Choke, No Primer, 2 Needles
WA-174-1, No Choke, No Primer, 2 Needles
WA-175-1, No Choke, No Primer, 2 Needles
WA-190-1, No Choke, No Primer, 2 Needles
WA-192-1, No Choke, Primer, 2 Needles
WA-193-1, No Choke, Primer, 2 Needles
WA-196-1, No Choke, No Primer, 2 Needles
WA-197-1, No Choke, No Primer, 2 Needles
WA-203-1, No Choke, No Primer, 2 Needles
WA-208-1, No Choke, No Primer, 2 Needles
WA-210-1, No Choke, No Primer, 2 Needles
WA-213-1, No Choke, Primer, 2 Needles
WA-222-1, No Choke, No primer, 2 Needles
WA-55-1, No Choke, No Primer, 2 Needles

11.11mm
HDA-113-1, No Choke, Primer, 1 Needle (no high speed)
HDA-131-1, No Choke, No Primer, 2 Needles
HDA-135-1, No Choke, Primer, 2 Needles
HDA-147-1, Choke, Primer, 2 Needles
HDA-149-1, No Choke, Primer, 2 Needles
HDA-155-1, Choke, No Primer, 2 Needles
HDA-168-1, Choke, No Primer, 2 Needles
HDA-169-1, Choke, No Primer, 2 Needles
HDA-201-1, Choke, No Primer, 1 Needle (no high speed)
HDA-206-1, Choke, No Primer, no Needles
HDA-210-1, Choke, No Primer, 2 Needles
HDA-220-1, Choke, No Primer, 2 Needles
HDA-59-1, Choke, No Primer, 2 Needles
HDA-60-1, Choke, No Primer, 2 Needles
HDA-64-1, Choke, No Primer, 2 Needles
HDA-70-1, No Choke, Primer, 2 Needles
HDA-90-1, Choke, Primer, 2 Needles

11.13mm
WT-15-1, No Choke, No Primer, 2 Needles
WT-21-1, No Choke, No Primer, 2 Needles
WT-570-1, Choke, No Primer, 2 Needles
WT-8-1, Choke, No Primer, 2 Needles
WT-83-1, No Choke, No Primer, 2 Needles
WT-9-1, Choke, No Primer, 2 Needles

11.13mm
WA-106-1, No Choke, No Primer, 2 Needles
WA-1-1, No Choke, No Primer, 2 Needles
WA-112-1, No Choke, No Primer, 2 Needles
WA-113-1, No Choke, No Primer, 2 Needles
WA-115-1, No Choke, No Primer, 2 Needles
WA-126-1, No Choke, No Primer, 2 Needles
WA-133-1, No Choke, No Primer, 2 Needles
WA-141-1, No Choke, No Primer, 2 Needles
WA-142-1, No Choke, No Primer, 2 Needles
WA-151-1, No Choke, No Primer, 2 Needles
WA-155-1, No Choke, No Primer, 2 Needles
WA-18-1, No Choke, No Primer, 1 Needle (no high speed)
WA-19-1, No Choke, No Primer, 2 Needles
WA-200-1, No Choke, No Primer 2 Needles
WA-25-1, No Choke, No Primer, 2 Needles
WA-32-1, No Choke, No Primer, 2 Needles
WA-33-1, No Choke, No Primer, 2 Needles
WA-34-1, No Choke, No Primer, 2 Needles
WA-39-1, No Choke, No Primer, 2 Needles
WA-44-1, No Choke, No Primer, 2 Needles
WA-53-1, No Choke, No Primer, 1 Needle (no high speed)
WA-54-1, No Choke, No Primer, 1 Needle (no high speed)
WA-58-1, No Choke, No Primer, 2 Needles
WA-64-1, No Choke, No Primer, 2 Needles
WA-65-1, No Choke, No Primer, 2 Needles
WA-73-1, No Choke, No Primer, 2 Needles
WA-75-1, No Choke, No Primer, 2 Needles
WA-78-1, No Choke, No Primer, 1 Needle (no high speed)
WA-8-1, No Choke, No Primer, 2 Needles
WA-85-1, No Choke, No Primer, 2 Needles
WA-86-1, No Choke, No Primer, 2 Needles
WA-92-1, No Choke, No Primer, 1 Needle (no low speed)
WA-96-1, No Choke, No Primer, 2 Needles
WA-99-1, No Choke, No Primer, 2 Needles

I have a new Zenoah G20ei engine that came with a Walbro carb. The numbers on the carb are WT 630 and there is also the number 811 under the the WT stamp. This carb has a choke, no primer and two needles. I like to remove the return spring on my gas engine carbs because I don't like the receiver battery drain associated with holding the throttle on under spring tension. However, when I removed the external spring on this carb, it still has a spring return action on the throttle. I have not run into this on other carbs. My question is: does this carb have an internal throttle return spring or some other spring internally? And if so, can it be removed without effecting the performance of the carb? I would appreciate any information provided.

Best wishes and good safe flying.

Heli-NuBee (Roger)

Dr. Here's a fuzzy picture of an opened Zama. The carb is opened to 12mm wide. The oval shape is because of the brass protruding into the venturi. A Dremel and Exacto did the job. My Poulan 25cc responded well to the change through out the rpm range. Prof. G.

Dr.
If you go to the big auction place check under
" Engines, Multi-Purpose" There is a guy there with
a store selling new Walbro carbs,very reasonable priced.

Nice guy too. I've got an 11mm w/choke coming.You might also
check the link below,just change the "series" search box, to whatever your looking for. Venturi size,high/low needles,choke,primer all are listed for all carbs.

http://wem.walbro.com/walbro/group2.asp?FamilyName=WA