My motor fires right up and runs perfect but when I run it hard around 5,000rpm or higher it sometimes Boggs down due to fuel starvation. If I squeeze the primer bulb while it is bogging it comes right back to full power. At first I figured it was likely a bad primer bulb but it is not collapsed when this happens. It is soft (not rock hard) but not collapsed. Motor runs perfect at any and all other rpm's. It seems to be an intermittent problem it does not do it every time I run it hard. Any ideas?