Recent content by Wurzel

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