Call John Deere 888-803-9175 and get an engine manual for your particular engine. I ordered a parts n service manual for my model 100- 12" chipper from a local bandit dealer. They included a generic operating & parts manual for models 90/150/200. That manual gives nos. to call for specific engine n clutch mfgs. I'm glad I got my manuals before using my machine. It's so important to follow manufacturers' maintenance and operating recommendations for safe n efficient use!!