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'98 XR250R - stalls after valve adjustment

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Guys - looking for some advice. I adjusted my valves the other day using the excellent posts on this site. Much better than the factory manual. - Actually did it several times to make sure - Engine runs good, no tapping, etc, but now when I open the throttle wide from idle, in neutral, it stalls. Never did that before. I'm wondering if I still don't have the valves adjusted right, or do I need to mess with the mixture after doing the adjustment? PS this was before hooking the decompression cable back up - not sure if that matters or not. Thanks in advance.

PS - The bike has the air box, exhaust tip, and jetting mods. Not sure what size jet...... Thanks

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