like what was previously stated, if you exceed the 3600RPMs that the engine was designed to perform at for any long period of time , the most common thing is most likely Rod Failure, or crank shaft breaking, causing the rod to come through the block, giving you possible personal injury to you:thumbdown:. You can run an engine without a govenor ,as long as you dont hold her open for to long , if children are riding ,its best to leave it govorned:smile: