Need some base carb adjustments for the 2004 crf150 , from full closed...how many turns out to get started ?

Usually when purchasing a new Carb, they are set very close. No adjustment needed. But if you want to play, turn both the High and Low screws all the way in then turn them bot out about 1.5 turns. that should get it started. The you will need to tweak the High sped and then the low speed and then the Idle

100% the issue is too much air. get your carb checked, reduce air intake.

open the air intake on the carb about 4 full turns then start the bike. if it does not want to start open the idle bring it up at least 5 turns. when it start at a very high rev, start closing the air intake slowly until you feel and hear you have hit the right spot. adjust your idle in the process.

NOTE: missfires may also be caused by a fouled out sparks

On an otherwise healthy machine, the carb tuning procedure goes like this:

1) With the engine off, turn both mixture screws clockwise until they lightly "seat". Then turn them back counter clockwise two (2) full turns each.

2) Turn idle screw CCW and observe the throttle shaft movement. When it stops moving, the throttle plate is completely closed. From here, turn idle screw back clockwise two (2) full turns.

These initial settings should be sufficient to get a healthy machine to start up and stay running for the carb-tune procedure.

START THE ENGINE AND ALLOW ONE MINUTE TO WARMUP.

3) Turn the mixture screw closest to the engine (marked "L" ) clockwise in small increments (1/4 turn at a time) until the engine smooths out. Then back CCW until you have a slightly rough idle.

4) Accellerate to full throttle and turn the mixture screw closest to the air filter (marked "H" ) clockwise until the engine revs get higher and eventually begin to fall off again. Turn back CCW beyond ultimate top speed . . . until a very slight flutter is heard at top speed.

5) Release the trigger and adjust base idle speed until the blades barely crawl, then lower it one more touch.

6) Repeat steps 3, 4, and 5 once more and then check throttle response on quick rev-ups. VERY VERY small adjustments to the "L" screw in a CCW direction will give better response but larger adjustments will affect "H" settings.
That's it.

Special note for step 5: When you make the FINAL base idle adjustment, set it as high as possible without allowing the blades to move. This facilitates easier starts when warm.

Hope this helps,
Dolf-

Clean air filter, fresh fuel mix, and saw at operating temperature before adjusting anything. HTH
Lou

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

try disconnecting the throttle cable, loosen carb linkages, assure that both carbs are FULL closed....tighten linkage - and cable ...check for FULL open and close with the throttle....this will be your starting point, advise to get a service manual for your outboard model to correctly adjust the carbs for max performance....GL hope this helps..

You can adjust it by removing the EPA anti tamper caps. When you get them removed, turn the A/F screw out in 1/4 turn increments till you reach the desired result. You can also replace the pilot jet in 1/2 steps.