2bbl upgrade. Please chime in

panteramatt

For those of you who have put the 2 bbl carb on your vanny is it worth it? Will it make a decent noticeable difference on my 16hp? Where is the power felt in the powerband?

BGW

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jeff70

I haven't done it yet, but from reading and talking to other it is said to be the #1 upgrade, with better response and better power throughout.

panteramatt

Whats the part #'s or words I need to search for?

Morgan44

Tons of good info on this subject here in the big block section.

panteramatt

Ok after searching more and reading is this what I need:
Nikki carb from a verticle 23 vanguard
intake from a horizonal vanny part# 690886 or 806023

If so besides a filter not sure what I should look for.

nobuckbuild

i get most of my carbs off 20-26 hp intek engines just make sure the carb has a black center tube in it not the white

sho305

Bigger carb usually always help higher rpm power, allow more rpm. Most say its the most noticeable upgrade for stock parts upgrades.

Shack

I have a 23hp that came with a 2-bbl carb, but changed it out for a P/N 808626 that had adjustable Idle screws. AFTER I did it, I realized the new carb I had (Marathon1989 is the man) just had the idle screws covered by a blockoff covers. Do'h! I will say the ability to adjust the low/mid range fuel took out the "flat spot" in the mid-range.

Now, having said all this, I do believe the 2-bbls. start a little harder than singles, but performance is good.

panteramatt

Ok so any 2bbl carb from a 20hp on up will fit regardless if its horizontal or vericle right? And the black umulsion tube is the plastic part that under the carb right? Where do I get the adjustable needle kit?

1989Marathon

Most 2-barrels will fit(with a 2-barrel manifold), but if you want to use an adjustable needle, you'll need the carb with the black emulsion tube body. The adjustable needle is a Walbro 100-506.

The 2-barrel carb is the single best upgrade you can make, besides removing the governor and installing a rev-kit. Power is realized all the way through the rpm range.