This started last year when I tried the "cut spring" mod to get rid of backfire. It got rid of the backfire but the idle was all over the place, So I bought a new spring. Ever since then when I let go of the throttle, or back it off when coming to a stop, it wants to shut off. The idle drops right off. I have to be very careful, and run it at 12-1300 idle speed. Still sometimes it happens. I occurred to me that I had damaged the diaphragm, so I replaced it. No better. Today I pulled the carb, dis assembled it, used a carb cleaning tool in all the passages, cleaned it with carb cleaner, and blew it out with compressed air. I found nothing. The carb was basically clean to start with.
I have a Raask exhaust with baffles, a K&N slab filter in place of the stock filter, a 55 pilot with bleed holes, and a 150 main with a Dial-a-Jet to assist. I did a plug read today and it is a beautiful tan colour.
When I have the choke pulled out a notch it runs rich, but the RPM falls down to idle as it should. I have set the idle mixture as per Serow's thread. It is 2 turns out.
I can only get the smallest wire in the carb cleaning set through the hole from the TEV to the throat. Is that right, or should I be able to get a larger wire through?
Do I need to go up a pilot jet size?
I am stumped, and starting to get very discouraged.