I found a very loose cylinder head bolt on my 2002 Simplicity Conquest (16 HP Vanguard Twin). I have recently heard a noise like an exhaust leak, so when I was checking this out, I found the loose bolt.The engine shroud was the only thing keeping the bolt from vibrating all the way out. I also pulled the top engine cover, and cleaned the dirt and gunk from underneath. The flywheel and the ignition coils are very rusty. I cleaned them up a little, but they are going to need a thorough de-rusting in the future. I should also mention that I put a new voltage regulator on it a few weeks ago, after finishing mowing, and finding a dead battery on attempted restart, and I found a small shorting spring in the seat safety switch plug that wasn't "unshorting" when plugged in to the switch. I removed the spring, and this solved the intermittent problem of the engine dying as soon as I would let out the brake pedal, with the PTO disengaged, and while sitting on the seat. I am learning!
Edited by prosparky, June 04, 2013 - 01:55 PM.