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I am looking for information on the proper valve lash for a 420cc HF clone, ( stock ) - gov. I currently have it set at .004 for both and it seams to run ok but backfires on shut down:worried2: any help or experience would be appreciated

Hi I have found many good things on this forum so I figured I would ask the people with the information. hear it goes I have built a buggy using a 420cc predator clone and Polaris clutches and transmission. my question is has anybody used this setup and what kind of spring/weight setup did the...