Air fuel screws

[Michael66]

Does in or out richen it up?? My jetting looks dead on by the plugs (a nice medium brown color), but I loaded it in the back of the truck and bogged it on the ramps and died. Drove home and it wouldn't start. Spark was good so I gave it a shot of starting fluid and cranked right up. Now it cranks again first kick. Any ideas of why it was not getting fuel?? Are my air fuel screws out of adjustment?? Currently 2 turns out. Mods 240 mains with toomey t-3 pipes, stock silencers, k&n no airlid, bored over a hair W/ Wiseco's.

[mopar1rules]

the air screws adjust the amount of air that gets mixed into the pilot circuit. it pretty much controls the idle to off idle air mixutre. turning the screws out will lean out the mixutre, and turning them in will richen the mixture. what altitude are you at and what is your elevation? 230 mains sound too lean to me. what pilots you have in there now? you should need 27.5's w/pipes and no air box lid. also, try 1 to 1-1/2 turns out on the air screws, to see if that helps your starting issues. pilot circuit needs to be a little richer to help the starting problems, and turning the air screws in will do just that. also, going to a richer pilot jet will help too. how does the engine respond now, when you rev it up in neutral, and does it want to get real boggy on take off? you need to rev it up pretty good and feather the clutch to take off?

Edited September 15, 2009 by mopar1rules

[Michael66]

the air screws adjust the amount of air that gets mixed into the pilot circuit. it pretty much controls the idle to off idle air mixutre. turning the screws out will lean out the mixutre, and turning them in will richen the mixture. what altitude are you at and what is your elevation? 230 mains sound too lean to me. what pilots you have in there now? you should need 27.5's w/pipes and no air box lid. also, try 1 to 1-1/2 turns out on the air screws, to see if that helps your starting issues. pilot circuit needs to be a little richer to help the starting problems, and turning the air screws in will do just that. also, going to a richer pilot jet will help too. how does the engine respond now, when you rev it up in neutral, and does it want to get real boggy on take off? you need to rev it up pretty good and feather the clutch to take off?

You hit it dead on with the throttle, plus this thing is geared 15-40, so that doesnt help takeoff either. Elevation is around 400-500 ft. Im in north Alabama. I have no idea on my pilots, but I do have another set of carbs with 280's in them off of a parts bike I bought for $400. The motor from that bike is better than the one I have now (pistons, reeds, etc.). I bought it for with the juggs off and and found the kickstart spring against the clutch. Guess they thought the bottom end was gone. Anyway I bet the Pilots are bigger in those carbs too. I will pull them out before I swap them and see what they are and clean the carbs real good. I think i am going to run the airbox off the other bike. It has a lid on it with holes and a Twin air foam filter. I dont think i have enough mods for no airlid. Thanks alot, you are the only one that answered my questions dead on so far!!!

[mopar1rules]

no problem. don't mind helping people at all. i'm glad to help to the best of my knowledge. yeah, you probably will be better off putting the other lid on, w/the twin air filter and holes cut in the box lid. i would start in the lower 300's (310 or 320) for mains. 280's will still be small....you gotta give that shee some fuel:) keep stock needles w/clip in the middle position.

Edited September 15, 2009 by mopar1rules