Hey guys, I have a sweepster power broom with a 6.5 Briggs I/C engine. The engine smokes excessively. I ordered a replacement today, but I was wondering if it was worth repairing for back up. It starts easy, seems to have good power, and is about 4 years old. (only used for about a month in the spring) Have a feeling it's valve guides but don't have the time to repair and risk misdiagnosing. (need ASAP). Any sugestions would be appreciated.