I have a John Deere 345 mower with a 54 in. deck (95 or 96 year model), with an 18hp kawasaki motor. I started getting excessive smoking everytime I start it up. This got worse each use till I had to do something to find the cause. I found that the valve covers were melted on the bottom, these seem to be made of some sort of high temp plastic. I replaced the valve covers only to melt the new ones. The exhaust pipes going to the muffler are directly below these covers so I took the muffler off to see if it was clogged causing excessive heat, but no problems were found. I'm a bit stumped about what's going on now, any help would be appreciated.
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