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108cc w/ VM26 adjusting

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I just put my sons XR70R back together with TB parts stroker and big bore kit with a Mikuni VM26. The motor started up the first kick and runs decent but has a stutter off of idle if you blip the throttle quickly. Air screw was set at 1 turn. I have adjusted on it and the stutter is still there. Has anyone else done this kit and know what jets I need to have in. Thanks.:smirk:

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I tried the other jets that came with it today and no improvement. It had a 190 in it so I tried out a 160, 170, 180 and didn't lose the stumble off of idle. I am thinking that it needs a smaller pilot jet. I ended up leaving the 180 in it and let my son ride it and it had power all over but it did stumble on him a few times, mostly when he was lugging it in too high of a gear and low rpm. I am open for suggestions.

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