I've been swapping over the main jet (127.5/130) on my 34PIC3 carb, 1600 engine. After taking the carb off and on and off. I realised that you can change it in situ. By using a screw driver to loosen the main jet and pushing a wooden cocktail stick firmly on to jet then unscrew and remove the jet. You'll need to take the idle shutoff solenoid off to get access. Not rocket science, but works well and saves you distrubing the carb gasket to the manifold.
Mine was a 120 when I brought the bus I changed it to a 130 made the world of difference to mine that was on a 1600sp by the way.
Do you have a stock air cleaner or do you have one of these... https://www.jbugs.com/product/8674.html Or similar ? Or do you have a vacuum leak? Going richer often says something is not standard...
I don't think there's a vacuum leak. Have sprayed quick start around most bits Exhaust was a bit sooty so have gone for a smaller jet. Will run it and see.
Its a bit hard to tell by the exhaust as the engine will start up very rich with the choke on, making a lot of soot that covers the exhaust and the underside of the bumper with some exhaust pipe designs . Then once it warms up it stops making soot. Or if your choke is broken or not powered it carries on idlng very rich. Without other analysis tools the best you can do is to try and look at the plugs after driving a fair distance then letting it cool down so you can handle them. You may find then that they are not sooty but a lot cleaner and the colour may indicate a different story. My progressive spits black soot on start up with choke on but the plugs are not black when I look at them. Mind you I can tell that the oil temperature and cylinder head temperature and air fuel ratio readings are all OK as well.
Yep, take your point, the exhaust could be along way out. I'll go for a run and then check the plugs.
