I've a nicely broken in 53 that's given great service and, until recently, has always run great However lately it will not consisently hold a needle setting and any range of adjustment is considerably more narrow than it has been when it was "happy." Is this indicative of a regulator needing service or adjustment? That said, is this something I can tackle or should the engine be sent in for inspection and repair? Thanks for any suggestions or encouragement.

Mike