Hi. Really enjoying reading this forum, so much info & knowledge here! I've been involved with some lawnmower renovations over the years and have had a go myself a couple of times but I'm far from an expert. My query is regarding the viability of retro-fitting the older Zenith tca carburettor to an a114 Suffolk/Atco engine. The current carb is the Dellorto, and whilst the engine does start and run, in a mostly usable manner, I'm far more familiar with the Zenith unit, which provided they are clean are easy to tune properly.
The engine starts ok, I've cleaned out the Dellorto carb, if it runs rich there's more power but then it doesn't idle well, & whenever the throttle is opened fully quickly it tends to cough & splutter. Admittedly I am being fussy as I've always found that a good Zenith carb will tune easily, rev & idle well, even on a tired engine.
I understand that the governor assembly would be the biggest issue, with the Zenith's using the tried & trusted vane type & the Dellorto the mechanical type, which I've tried adjusting but with next to zero effect. As I have 3 or 4 spare Zenith carbs including the governor vane assembly, linkage & springs etc I'm wondering if this conversion is possible/has been done before? Can I just disconnect all the Dellorto associated mechanical governor assembly? Would the jet sizes in the Zenith tca carb be ok for the 114cc engine? Would a tca13-3 be any better than a tca13-2?
All this is presuming there is a spigot for the vane governor to attach to on the a114 block (same as the a98?) which I've not checked yet!
Apologies for the long-winded question and many thanks for your help.