TGB R9 151cc bogging on idle  By  unknownuser01 (Read 2,885 times)

I just got done setting the valves. Both were set to .003". I changed the exhaust to .004". I took more of the plastics off so I could reach the fuel ratio screw. For good measure, I decided to turn the screw 1/8 turn, then tried kick starting it. It wouldn't start. I then realized I turned the screw the wrong way. I assumed I flooded the engine. I've pulled the spark and I'm now letting it air out. I have turn the screw the correct direction(clockwise) 1/4 turn to correct my error. Hopefully I'll be able to start it up soon!

[replyingto=unknownuser01]unknownuser01[/replyingto]If you screw it ALL the way in then back it out 1 1/2 turns CCW it should start,,then you can adjust it from that point,,CW in until it starts to die,,then back out until the idle reaches its fastest RPM,,then either leave it there or turn it in an 1/8th or so.

Good Luck..

If its flooding so bad might have a stuck float needle valve,,or maybe the pin that holds the needle valve was not put in correctly,,i would take the float bowl off and make sure the needle seats up into the orfice properly and blow into the fuel line as you push the float up,,and when the needle gets pushed all the way up,,you should not be able to blow any air through,,thats how i check em.Then turn it over a few times without the plug,,clean and reinstall the plug and give it another try.

BTW-Make sure the crankcase is not full of fuel as a sticky needle valve will eventually flood out your crankcase oil also causing hydro lock and other not so pleasant things

So I turned the fuel mixture screw all the way in and back out 1 and 1/2 turns. got the scoot running! Then I started messing with the screw and flooded it again.

I pulled the spark to start airing it out, then pulled the carb to check the needle. Needle was fine. Since I pulled the carb and the fuel was disconnected, I cranked the motor until there was no fuel spraying out of the spark hole.


Now I'm waiting 20 min or so to try again, starting with the screw 1 and 1/2 turns out again.

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[replyingto=unknownuser01]unknownuser01[/replyingto]I like to get a high idle of around 2-2.5k RPM,,then turn the A/F CW until it starts to die,,then back her out till the RPM is at highest,,but dont go any father,,try to fing the spot where it begins to be at its highest RPM then re adjust idle for what you like,,or until the back wheel stops spinning.

I always leave a very small amount of free play in my throttle cable like an 1/8th inch,,if thats what you are asking.