Need suggestions on what size walbro carby to run on my 40cc Italian engine?:dash: port timing is 140/170

Cheers guys!
:drinks:

A Walbro WYK-33 rotary barrel would work great.
If engine is mildly tuned a WT-257 should work as well.

Cheers Scott! It has a Borg/Warner carby which does look a lot like a walbro. I know of borg warner carbs on cars but not sure whether its worth swapping? The wt 257 is a bigger bore in comparison.
:drinks:

Ozpulse wrote:
Borg/Warner ... Likely a TILLOTSON
If a 257 is larger than what you have .... thats going to be your carb

I run a Walbro HDA-86-1 on my QDHT25 and it is a screamer. It has .688 bore, but the butterfly goes through the butterfly bar, so you actually get the same amount of air as a modified 257 or a 488 with either having a thinned butterfly bar "and" there is no danger of the butterfly bar breaking and destroying your engine.

The HDA-86 comes with or without a choke.

I am going to try one on a modded Zanoah soon.