I have a 70 Mav 250 engine. The carburetor is a carter RBS single barrle. I just got done rebuilting it and trying to set it up on the car. I cann't get it to idle the engine dies. It will run if you keep the gas on. There is no idle adjustment expect for fast idle and the mixture. From what I could see you would have to bend the linkage to adjust the idle. Has anybody else worked on this type of carb? I really need to get this done. Car has been down for 2 weeks. I don't want to rebuild it again.
There are three screws to mess around with, one for the fast idle, one for mixture and one for curb idle, from the passenger side you have got the mixture to the right and the curb idle to the left, on the other side (or the carb) is the fast idle (cam and adjuster)... Before you crank the engine, step on the gas to the floor, to get the choke (fast idle) in the right position, when you got the engine warmed up (10 minutes) you, depress the gas a little and you will go from fast idle to just idle... The fast idle screw is supposed to be on the first mark on the cam when in fast idle. I´ll keep on posting, but tell me if I´m only telling you stuff you alreday know..? Robert.
Make sure you got all the vacuum ports either plugged or hooked up where they are supposed to, and that everything on the carb moves freely without any sticking or binding..
Well said on the vacume lines, impossible to adjust a carb if it has vacume leaks. As for holding it on the floor, hes referring to right at first, not to run it for 10 minutes w/ it on the floor
Sorry I´m such a bad writer, I thought for the first time I could really contribute with something, thank you for straightenig that 10 minutes thing out...
I had this problem a couple years ago. My 77 had no idle screw, some of the later cars did not have idle screws. But, mine did have the threaded hole to put one in. The carb was junk and I used another carb. But I learned that at least the threaded hole is there. Just need to get a screw to put in it. If yours does not have a threaded hole for some reason, have you thought about drilling and tapping one in? Dan
I've never heard of them not having one... I've seen the missing before, and it run like crap, but never not having one. Of course, you learn something new everyday. So, this may be the case. As for drillling and tapping it, I'd just go w/ a new carb
OK, I'll try to answer everyboby here. There is only 2 adjustment fast idle and the mixture both on the passenger side. The linkage is setup to where there is no place to put a screw for idle. This is a 70 carb the ones after would have a screw for idle. The vaccuam lines are good no leaks.
