AUTO X carbs

[yamaha driver]

so im running a 185s motor with 185s carb. Now is it true 200x carb gives you more power? if so should i get one of the orginal carbs. or a EBAY carb. Auto x guys what jets are you guys running in your 200x carbs? thanks

[atc350xer]

I'm running a stock 185s carb right now, but I'll be putting the 200x carb on in the spring.

[RapidRick]

I'm using both 185S carbs and 200X carbs. Frankly, I've got too many stock carbs to rebuild, I don't even consider the ebay knockoffs. I think I've gone up two sizes b/c of no air box lid, different air cleaner, and modified exhaust.

[Yamaha_Rules69]

I believe the 185/200s carbs were 24mm, and 200x was 26mm? Not 100% sure, but I believe the 200x carb is indeed bigger, and I know it adds a little power, as I have compared the two myself. The XR 200 carb is a 28mm, and would be better yet, especially if you already had performance pipe, and XR camshaft or better. Remember, when you put the 185 or 200s motor in the 200x chassis, you have to use the 200x intake manifold, as the "s" intake comes out at a different angle, and the carb wont clear the frame. Good luck!

[Vealmonkey]

You can't rely on others jetting. You have to jet for your engine and for your location.

[yamaha driver]

ok. so veal could i take the numbers of the jets in my 185s carb and just get a jet that size for a xr carb? also what year xr carbs fit? (cause im at stock jetting right now and with all my mods still rich lol)

[AutoXer]

get a e-bay carb and put a 110 main in it and ride like the wind and enjoy a wheeler that idles like a brand new one..... my .02

[yamaha driver]

Ok i might get the ebay xr carb, but 110 jet?? that's gonna be way richer than donald trump.

[AutoXer]

I'm 500' above sea level and i use the 200x carb with the 110 main and what ever was in it for the pilot ..... as others have said you really need to jet to your altitude and mods but I would be surprised if my setup dosent work for you

[yamaha driver]

well like i said earlier in the thread im at 95 main in a 185s carb with the needle at the top and when it idols its almost like a diesel with the black smoke coming out... and since im at about 300ft above sea level

[AutoXer]

you have to keep in mind that a new carb with no dirty passages and bigger (allowing more air) could accept more fuel

[Yamaha_Rules69]

It sounds like you need to adjust the air/fuel mix screw located on the bottom of the bowl. If its closest to the engine, then its a fuel screw, so turn it in to lean it, and out to richen. It its on the airbox side of the carb, its an air screw, opposite, so in for richer, and out for leaner. I cant remember off hand what side it is on, but have messed with them a lot. They are hard to get at, and you will need a small, short (thats what she said) standard screwdriver to adjust it. The correct but tricky way to set it is to turn it in slowly and carefully count the number of turns, about 1/4 turn at a time. Do this until the engine slightly stumbles, then start turning it out, until the engine stumbles. If you counted the number of turns correctly, it should be set by turning half the number of turns you just performed. I hope I didnt confuse you.
Adjusting the needle has nothing to do with the low end/idle of the motor. By adjusting the jet needle adjusts the way the engine runs from 1/4 to 3/4 throttle, then after that its the main jet to wide open.

[yamaha driver]

Air screw doesnt help since i have it almost all the way out turned in just a bit to make it stay in and not wobble. and moving the needle helped a little since now im only using like 2 plugs every weekend instead of like 4

AUTOXER: yea i might just get a mikuni xr carb off ebay and tryit. since i know everywhere around here sells mikuni jets and they are relatively cheap

[DasUberKraut]

Sorry to dig up an old thread.

I just picked up an 85 Auto-X with a 200S motor. Not sure which carb is on it at the moment but I know the floats are stuck so it has to come off for a cleaning. I do have a carb off an XR250R... Would I be better off putting that on? I will ID the current carb tomorrow.