Question about 2008 Tomos Se 125 F

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Need to know about carb adjustment for tomos st sept 2010 question 1 the screw adjust questtion 2 finger turn adjustment what do either do and if totally screwed in how many turns out do i do to either so that i can begin to proporly tune?

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LIGHTLY seat the air screw and the throttle screw. Now open both of them up one and one-half turns. Adjust idle speed with the throttle screw. Normally, the throttle screw sticks out about 1/2" to 3/4" from the throat of the carb. The air screw is short and usually recessed. If the screws have been tightened down anything more than lightly, the screw seat may have indented the screw face. If the face is ringed, the engine usually will not run well. The screws would need to be replaced. Please rate my answer. Thanks.
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Posted on Apr 08, 2011


Paul bowen

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My bike only goes 15 mile hour it should do 25 it sound like it needs gas

Posted on Dec 02, 2012

  • Paul bowen Dec 02, 2012

    My bike only goes 15 mile hour it should do 25 it sound like it needs gas



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1 Answer

How many turn it take on the air mixture screw to get my 2010 Kawasaki 360 4x4 to start?

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- lightly seat the pilot all the way to the back - lightly, too much torque and you'll ruin the o-ring in there - then back out the pilot screw 1 & 1/2 turns. From there - you let it run for 10 minutes or so and then adjust the idle to 1,300 +/- 50 rpm - turn your handlebars left and right after adjustment of the throttle lever to make sure it's okay and not binding up - and do your adjustment from the throttle stop screw. According to the specs, once you set that pilot at 1,300 +/- the rest of the adjustment is done with the throttle stop screw. If you do all that and it's still not picking up fuel - definitely give the intake/carb boot a good look over for any cracks or anywhere vacuum could escape - and if it still doesn't pick up the fuel - give the throttle set screw a turn or two. Had a 2000 Yamaha XT225 carb I rebuilt a few weeks ago - adjusted everything as instructed - but it wasn't picking up the fuel. I gave the throttle set screw about a 1/3 turn in to put a little nudge on the throttle and it fired right up. All The Best and Good Luck - Justin Lee, 17 South Industries, LLC

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How adjust the carburator???

Be careful while doing this
1. Pull out the air pipe between the carb and the head. You will see that a rubber pipe is fitted to carb insulator. Pull it out.There will be a brass pipe. Close it with your finger. If you do not close it your bike will not idle.
2. Now set the mixture screw to 1.5 turns out.
3. Now start the bike. Be sure to close the air injection at carb insulator with thumb of your left hand.
4. Now increase the idle by idle screw to 2000 rpm.
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6. You will see the idling rising. continue until maximum idling is obtained. Beyond a point idle will not increase at all and instead decrease. At the point where idle is highest stop turning the screw.
7. You will see your idling is highest and also the rpm needle is constant.
8. Now decrease the idle to 1.2k. stop the engine.
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10. restart engine and check idle.

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How do you adjust the high speed mixture screw? I have a Ryobi RLH1100a MK III 31cc line trimmer, and after changing the fuel lines, it will start but not idle more than about 3 - 5 seconds before it...

Hi montex124, I will try to help. In the past few years carb makers have been making changes. Some carbs have no adjustment at all, the ports are all fixed inside the carb. Other carbs have only the idle speed mixture screw that can be adjusted, like yours seems to have. Is this screw you mention at the top and completely outside of the carb to adjust the throttle? If it is it's probably the idle speed screw which can be adjusted to any idle speed you want and has nothing to do with the air fuel mixture but If it is right next to the idle mixture screw, it might be the high speed mixture screw but is capped so it can't be adjusted. The low and high speed mixture screws should be marked next to each screw H and L.
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Two Screw Carb: You adjust the one to remedy either the low or high, high is adjusted until the motor runs smoothly under load at high RPM and the low is adjusted until idle and off idle is smooth.

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