I recently posted couple of questions initially relating to a starting problem (which was resolved-starter switch). Then the dealership told me I had an issue at 44k miles w/low compression and suggested I was looking at an $1100 top end job. I have got a tap, tap, tap noise in the front cylinder. Intermittently, I have to crank it for an extended period of time and then it will start and run for 2-3 minutes on one cylinder. There's no smoke out the pipes-ever. I followed a lot of advice given previously including changing to a bit hotter plug (my morning start/drive has been in 12-15 degree temps. The plugs I pulled out didn't indicate any problems that I could tell. To make a long question short, l plan to get a leak down test done and if it indicates a top end teardown is necessary. Would a novice-intermediate level mechanic be absolutely foolish to attempt any of the work himself? How about pulling the engine and taking it in whole (saving the labor cost there)? I found a few used Shadow engines on e-bay out of Florida for $800 (the guy had pretty positive ratings). Would it be absolutely foolish to go with a used engine?