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#Post#: 89680--------------------------------------------------
HDA carbs
By: Cut4fun Date: November 28, 2022, 8:41 am
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Putting here till I get all the info sorted again
Hda 120 vs 87
Venturi 15.08 vs 16.66 mm on Walbro home page
Throttle plate 17.4 vs 19mm
HDA-87 16.66 venturi
HDA-117 15.08
HDA-120 15.08
HDA-144 15.08
HDA 49 12.7mm Venturi
HDA 164 16.66mm
HDA 137 16.61mm
HDA 77 15.80mm
HDA-87 16.66 mm
HDA-117 15.08
HDA-120 15.08
HDA-144 15.08
#Post#: 90064--------------------------------------------------
Re: HDA carbs
By: Cut4fun Date: June 14, 2023, 7:17 am
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China carb HDA TW measuring it best I can, the China carb
venturi is 15mm, so about 1.6mm smaller than the 164&137. Both
the choke and intake side is 19mm. This is a 62cc Chinese
chainsaw carb from ebay, like $20 shipped from china. It's a
copy of a Walbro
Me - Sounds like a mixture of 87 120. = Hda 120 vs 87
Venturi 15.08 vs 16.66 mm on Walbro home page
Throttle plate 17.4 vs 19mm
#Post#: 90065--------------------------------------------------
Re: HDA carbs
By: Cut4fun Date: June 14, 2023, 7:24 am
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Throw this here too. Difference in the smaller carbs on echo
800P compared to the early 8000's
HDA-153B 15.88
HDA-45-1 16.67
HDA-63-1 16.66
Echo 620 afm oem carbs Venturi diameter about 18.7 per Chris
info of guy swapping the choke and throttle stuff. = Chinese
620 carb on a Poulan 380 by swapping over the choke and throttle
shafts. It worked very well, holds a tune and responds as you'd
expect to h and l adjustments without being finicky.
#Post#: 90468--------------------------------------------------
Re: HDA carbs
By: Cut4fun Date: February 3, 2024, 10:21 am
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Guy I was helping with info on poulan carb swap. Even the HDA49
shafts can swap in with fix.
Got the 620 carb oem and afm, swapped the shafts. Looks like it
should work perfectly
I had to file the flat maybe .020” wider to fit the larger
butterfly. On the throttle plate.
The choke shaft swapped without any issues
Yeah for sure, this should help out as an upgrade to a lot of
the NLA carbs. Thanks for letting me know!
The hole was even machined into the 620 carb for the ball and
spring detent even though the 620 doesn’t use them
I couldn’t find an afm up here but there were lots of options
for other 620 carbs. And they probably all come from the same
factory
The 49 shafts are slightly smaller diameter than the 620 shafts.
Maybe .005-.010. I don’t think I’ll have any air leakage issues
through it. But it’s enough that the 620 shafts won’t fit into
the 49 body
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