Here is a list of Zama carbs that are 11 mm. Zama's run about the same as Walbro's if you get the same size. I don't know who did all the work of making this list but they did a great job. --Jim

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