Mutt wrote:So Dave, how are the E or F cams working out for ya?
It's a 54 KH motor, but it was tweaked - E or F cams, KR #7 heads, KR valves, KR double-valve spring setup. When I got it, it had a magneto, straight pipes and a 20 tooth trans and 51 tooth rear wheel sprocket. Very streetable, very perky. Good acceleration, not quite as strong as my 62 XLCH, but no slouch either. The straight pipes were really loud. The previous owner said it had sounded "constipated" with the stock exhaust system.
Engine completely rebuilt. Fixed a crack from one valve seat down into the cylinder - but above the ring lands (using lock and stitch). Replaced valves, no margin left. Stainless KR valves from Enfield Racing. Replaced the double valve springs - RD Valve Spring #1005 (Thanks, Dennis Schoenfeldt). Used stock timer instead of mag. Set timing at KHK setting (mark at rear of inspection hole, ~31-degrees) Stock exhaust system. Went to 21 on the trans sprocket (stock) and 49 on the rear wheel sprocket (stock).
I just got it running a week ago on a rare 60-degree day, and its maiden voyage was 32 miles. The next day it dropped down to 40-degrees, and then we had snow. Tonight down to 13.
Good acceleration, good steady cruising, idles fine. Stock exhaust sounds nice, does NOT sound constipated. Listening to the bike, I can't tell that it has big cams. No poor idle, no loping, no "coming on" at a certain RPM - it just runs strong in all ranges.
I can't wait for the weather to warm up so I can be riding again. Only change I'm gonna make is to advance the timing a degree or two and see if it makes any difference.