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It depends yes if it's to full it can cause problems. I have a metal cross piece about an inch below the top of the neck I just fill it up to there. It needs some space for air. The gas tank needs to breath. I was riding around with my friend once and his just died so we checked the gas and it had some fuel in it and it started back up but another couple miles it died again. Needless to say he had to keep the gas cap off till he got home. I just don't remember what was wrong. He had to replace either the gas cap or there is a vent hose on the top of the tank that might of been kinked or something I just remember it was a simple fix.
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