I have a 1999 Suzuki Intruder 1500 LC with 70,000 miles on it. Have kept the oil changed and well maintained since I bought it new in 2000. Have noticed a little popping on deceleration lately. Performed a compression test with the engine hot and found my front cylinder is running 140+ but rear cylinder is 122. Took a trip on it a few weeks back and during the trip, it started backfiring a little at one time, and then seemed to have a light clicking when cold, but then seemed to straighten up. A couple of times since, I noticed when I started it, only one cylinder ran for a few seconds and then the other cylinder kicked in. Any suggestions? Can you overhaul the top end, without changing the rod bearings?