Jimmy Spencer was suspended Monday from all NASCAR-sanctioned competition until Aug. 26 for punching Kurt Busch in the garage at Michigan International Speedway.
Spencer was also fined US$25,000 and placed on probation through the end of the year.
Busch, who suffered a bloodied nose and chipped tooth, was put on probation until Dec. 31.
"This was a very unfortunate situation," NASCAR president Mike Helton said. "Emotions are a part of every sport, NASCAR Winston Cup racing included. However there is a fine line. In this instance, that fine line was crossed."
Spencer could still face criminal charges, Sheriff Larry Richardson said Monday
Spencer will miss the Truck Series, Busch Series and Winston Cup race this weekend at Bristol Motor Speedway -- the site of one of the first flare-ups in Spencer and Busch's feud.
Busch, who had surgery last year to correct a deviated septum, was examined on Monday and said doctors told him the swelling to the left side of his face will take three months to heal.
Jack Roush, Busch's car owner, was furious his driver was placed on probation.
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