lexpaul Posted April 11, 2014 Share Posted April 11, 2014 Hey guys, New member, look at my pictures. I just picked up, what appears to be, a 1973 AT3. The frame and motor # AT1-219394. It runs but not very good. It has a new battery in it and starts easy, but it is a bit of a bogger, and so I am going to start this project by cleaning the carb and replacing the points and condenser / plug. Here's the deal, I will get a book but don't have one now. Question, I have two different plugs in this thing, it's hooked up to a NGK B8ES and the spare is a W24ES-U ( not sure of what brand this is). So, is either of these the correct plug for the bike? Does this look like the original carb Mikuni - what would be the basic start point for the two screws in the side, how many turns out from closed? The bikes in nice shape but dirty, chrome is good after wiping off, seat is trashed (where can I get new foam), Electricals work, baffles in pipe, brakes are shot and cables need replacing, hi/lo works, tank is almost clean, doesn't appear to leak anything. Shifts nice Any suggestions would be appreciated. I am not a mechanic, but I went through the restoration from hell with my T500 and this one looks to be baby stuff compared to that,, thanks Link to comment Share on other sites More sharing options...
obriens65 Posted April 12, 2014 Share Posted April 12, 2014 Link to comment Share on other sites More sharing options...
Moderator Cynic Posted April 12, 2014 Moderator Share Posted April 12, 2014 2 plug head dates back to when plugs were less effective outside their optimum, so you had one to start and cold running another for highway (speed) work. its the right carb, why are you worried about the screw settings, is it running bad. As far as it matters the one with the spring behind it sets the tick over speed by lifting the slide slightly, the other is the mixture screw (does precious little apart from the transition from idle to main jet. Its normally around 1.5 turns out. Link to comment Share on other sites More sharing options...
blackhat250 Posted April 12, 2014 Share Posted April 12, 2014 Welcome paul ,,,she looks good,, B8ES is the correct plug,,,, most parts are available on ebay . some OEM even... Link to comment Share on other sites More sharing options...
Recommended Posts