Pulled an old Scorpion SC-2 out of the shed that hasn't been run in around 10 years and got it to run for a bit after dumping gas in it. Ran for about 30 seconds and then stopped and couldn't get it started again. Didn't think much of it since we planned to clean the tank and carb and was just happy that it still fired up. After cleaning the tank and carb and installing a new plug, we can't get it to even fire. Tried a couple new plugs and verified there is spark. Also tried starting fluid but nothing. We noticed we have to crank the pedals at a fairly high rate to get spark. Is this typical? Any ideas on what I should try next?