my son has a 07 JM 150- while setting still/ idling or engine off and parked - gas pours from the carb overflow tube- i havent tweaked the carb that much- other than getting the JM to idle smoothly-
this is a pain in the a**- anyone have a similar problem ?
i also have a few other pains but ill deal with them one at a time---------

One of my 07 150's did flow gas out also. I had to readjust the Float in the carb which is not too hard to do and you can even do it with out removing the carb. Just undo the two nuts that hold it to the intake pipe. Rotate the carb to the Left side (if memory servers) then remove the three screws that hold the bowl on. You adjust the float by slightly bending the metal tab that the Needle rests on. Just don't lose any parts and inspect carefully how it goes together before removing the float. Also you want to make sure there is a Vent hole in the Gas cap Rubber piece, if it's not drilled through then do it.
Any other help just ask, I have had my two 150's for a few months now. You may want to cut away at the steering stop also to increase the turning radius! See the "Mod and Repair" page on my site!
My Site

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Our riding Videos: http://myjetmotos.8k.com/whats_new.html
Jetmoto ATV 250 Sport Blue
Jetmoto ATV 250 Sport Red
Jetmoto ATV 150 Sport Blue
Jetmoto ATV 150 Sport Red
Honda CM450c
78 Honda CB750
79 Honda XL500

I've not had that problem yet....what other problems are you having?

Welcome to the forum kyjetmoto !

If the 150 is new, some of them can leak gas for the first 1/2 hour or so. If its been longer than that, outofline gave some great advice on how to fix it.

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07 Jetmoto 250 Sport
07 90cc Mini Ute
06 Jetmoto 200 Enduro
06 Jetmoto 200
06 Jetmoto 150
06 Jetmoto 125
04 Yamoto 150
01 KTM 400 EXC
92 WR 250
91 CR 250
88 YZ 80
85 CR 500
83 XL 600
82 XR 200
79 XR 75
79 Odyssey
73 Bultaco 360
71 Rickman Montessa 250
70 Rupp Enduro
69 Honda 50

The 150's have been a pretty good little quad and I have been quite impressed with the power even pulling my 235lbs around. They have climbed anything I have attempted so far. The only little things are the turning radius is way bad from the factory and needs the Mod. The muffles rattle really bad and need some internal work to stop the arrestor part from rattling. Watch the gas tank bolts, mine have come lose and I have lost a few. Most all the Castle bolts on the front steering need to be lowered to the cotter pin, you can see in my steering mod photo how I added an extra washer to do this. Your steering will come lose and sloppy! Check all your bolts often!

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Our riding Videos: http://myjetmotos.8k.com/whats_new.html
Jetmoto ATV 250 Sport Blue
Jetmoto ATV 250 Sport Red
Jetmoto ATV 150 Sport Blue
Jetmoto ATV 150 Sport Red
Honda CM450c
78 Honda CB750
79 Honda XL500