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Well more cleaning with particular attention on the main jet, reaming through with some old wound guitar strings and I think while it looked clear before, there may have still been a slight restriction, is certainly revving better now. Also put more high pressure air through everything again...

Yes I should mention external photos were taken pre-boil. Its cleaned up the outside well enough but will need the acid / salt or acid / baking soda mix to sort the green, CLR eats brass from what I see. I've found one Chinese one with horizontal throttle and choke plates and what looks to be...

I've removed that jet numerous times and checked clear, but maybe there's some type of restrictive build up I've missed. I think it is just the straight passage from memory, but I'll check; also emulsion tube seating. Boiled carb and back on, temporary fuel supply didn't change the condition...

I sealed the welch plug up with a cap of glue as temporary measure, I'm certain it was now airtight. @Forest#2 you mention a high speed adjustble jet, which are you referring to? The one in the bottom of the bowl (254 below), I undertood to just be a drain plug, certainly loosening it means...

Yes aluminium crossover intake

UK, note its an 'Aisan' not 'Asian' carb

Thanks both. We have previously tested for good flow at the carb inlet, but not the passage between the inlet and bowl / main jet. I've had the float valve apart but can't recall what tip it has or what it seats in. I'm pretty sure I blew it all through previously in the initial carb cleans, but...

Yes the main jet and emulsion tube above have been out a few times and thoroughly checked, including the cross drilled holes in the tube body. I can't find any leak around any manifold mating surfaces or seams by using carb cleaner. I will swap the gaskets between carb / manifold adapter /...

Finally had some time to get to it this afternoon, have confirmed spark on both cylinders and also that it will run on either. I also made the governor / carb connection more permanent as it had been hooked over temporarily, which made me take a closer look at how it was working. I'm fairly...

Quick update - coil has arrived and is fitted but while it revs much better without choke, the problem remains, it will only take maybe 70% throttle. I've been a little short of time of late, but will get into valve clearances etc next.

Yep - I certainly should have, I got distracted chasing down a fuel issue, I even have that tester... Not being familiar with these engines I'd totally missed it was only running on one as well, had it been a four pot it would have been obvious. In any case, coil ordered, fingers crossed it...

Removed the kill wire to that cylinder and it's still not firing, so am assuming a dead coil - happily they're fairly cheap to replace.

Progress at last thanks to your pointers, it's only running on one cylinder, #1 is down. The plugs are in a very different condition, the one on #1 cylinder having done little to no work. Swapped the plugs with each other and #1 still not firing, tested and confirmed no spark on #1. Checked...

Could be a thing, they're composite

Not yet, will do but have good flow at carb inlet

Yep next job, hopefully not 😐

Having some trouble finding a compatible one, the linkages are top mounted on most of the ones that claim to be replacements...

So a couple of videos, the first showing it running flat out with about 80% choke, then the effect of removing choke, shown at the carb, where it starts stumbling and dies. The second is it starting at idle with no choke, then trying to gradually introduce revs. Full revs to no choke...

No that's only if it's running fast with choke and i take the choke off, or when I try to rev it more than it wants to go, without choke. It's like a carb backfire. I'll get a video tomorrow to demonstrate!

Having that much old fuel in the tank (turned out to be about 4l) was a massive oversight given I only put a little fresh in - so I was convinced that would be the issue. But alas after dropping the tank, draining the fuel line and hooking it up to a fresh fuel source, it's made no difference. I...

With workshop facilities still under construction for a couple of weeks I'm a little limited, but nonetheless I did get a bit more done this evening. Carb: Had the carb off again and got into the transition ports and idle port with fine wire, plus compressed air. I can see clearly through the...

I haven't fired compressed air through there yet but it has had a load of carb cleaner through. I'll also try compressed air in case the carb cleaner hasn't moved something, plus a wire guitar string I've found works well. I've pictured the fuel screw port in the venturi below, what do those...

Video showing choke effect:

Am now wondering what it is! It looks like a Vanguard, but is branded John Deere, code plate below and Briggs plate from the other side also pictured. Will check manifold leak with carb spray but it's pretty snug. I'm struggling with it running flat out on choke, evidently getting enough fuel...

@slomo thanks and agreed I can find no pilot jet and there's no evidence of one on the diagram above, so I don't know how the pilot circuit works on this carb. It has a fuel mixture screw which I've checked and the tip and seat it sits in are good. It does seem to be ticking over a touch better...

So have had the carb out again, also emulsion tube out this time as well, but it was already clean. I found three tiny holes just on the air side of the fuel screw hole which I thought might have been blocked, but they're clean as well. All back together and same problem - it will tick over...

Thanks for your pointers @slomo ! I'll double check fuel supply and also drain and refresh the tank so can be sure there - I've run with the tank cap on and off as well. Choke definitely not stuck on, I'm watching it at the carb. I'll take the carb apart a third time and make a note of each...

Hello All - am hoping the knowledge bank here may be able help. I'm resurrecting a John Deere LT166 lawn tractor with 16HP Briggs engine. It has sat for 2-3 years but was running fine, save for a snapped deck belt, previously. I've stripped and cleaned the carb and got it started, driving and...