Factory carb settings for a 1990 yamaha rt 180 two stroke

SOURCE: flaot setting for 81 yamaha 650 maxim (4 ea.)

# 1carb left 0.04+or-0.04 inches mm 1.0+or-1.0 # 2 carb right 0.08+or-0.04 2.0+or-1.0 hope this gets you there

SOURCE: settings needed for mixture screws

Turn both screws inward and seat them GENTLY. Now turn both screws one and one half turns outward. This is the factory setting.

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SOURCE: Bought a 2000 yamaha yzf600r

You can fail emissions on a bike in arizona ? Wow i thought california was bad....anyhoo let's get to your concerns....All those srews should be very close to the same setting....rule of thumb is start at 1and1/2 turns out on each screw, almost any gasoline engine will run at these setting then you can fine tune from there.....no wonder you had bad idling problems...Good luck to you friend....Tim

SOURCE: whats the best and easiest way to set the carbs on

Your problem is probably the sycronizing as long as you havent messed with the fuel screw or jetting. If you dont have a set of vacuum guages you can eyeball the slides in the carbs to at least get you by and you can usually get them pretty close. Find the carb that is directly linked to the cable. the other carbs are adjustable to that carb so you need to make all the other carbs identical to that one. Look at the gap from the bottom of the slide to the bottom of the bore of the carb on that base carb with the throttle at idle bike not running. With the adjustments on the linkage to the other carbs adjust the other slides to the same height as that base carb as close as you can. Measure if possible to get all the carbs as close as possible to each other. you may have to adjust the idle after. If the adjustments on the carbs are all cables, for example there is a cable to each carb directly connected to the slide just adjust each cable accordingly and achieve the same as above. make sure you have a little freeplay at the throttle when you are done. you can adjust that by the cable adjustment by the throttle which will keep all the carbs in sync

SOURCE: 1986 YF 60 4-Zinger. carb settings

The air/fuel screws won't have any effect on the top end. That would be governed by the main jet. Did you install the Boyseen Reeds? If this is a new addition it could be the problem. Another thing could be the fuel level in the carburetor bowl. When you tore down the carb it is possible the float got out of adjustment. You could drop the bowl and see if the fuel level is correct. If not, bend the tab on the float to adjust it.