I have a 1978 Exciter. I went up to the salvage yard and got cylinders,heads,carbs off a phaer 485. Every thing went well with the build, The cyclinders looked good. I honed them out and installed new pistons. It had boyseen Reed also. Now my problem is it starts and idles great, But when I stab the throttle it pucks. I dont have an air box on it yet and plan on putting foam air cleaners on it. I have cleaned the carbs very well several times. I have put new choke plungers in. The rubber plugs are in ruff shape but seem fine. I have them installed in the middle port and the other in the one with the jet in it. Is this correct? I do have new rubber plugs on order. If I throw the choke on it hits and ribs but then it will puck. I'm thinking its some Kind of fuel problem.:dunno: I am stumped here. Any help would be great. We have a backyard race coming up with pre 1982 and 440cc sleds. I guess this is what I get for trying to pull a fast one.