Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

A couple years ago when starting our Ariens ST524 for the season's first snow fall, I had a heck of a time trying to get it to run with the electric start (which never happens).  When it finally did start, the engine raced at several hundred rpm higher than normal.  It was turning so fast I thought for sure it was going to blow up.  The throttle control had no effect but luckily the key did.  I let it sit for a while as the foam dissapated from the oil and then proceeded to pull-start it.  It ran fine and I've been afraid to use the electric start ever since.  What would have caused the over-revving with the electric start?

Thanks!