Some time ago I had a new piston (low expansion) and liner in my Comet.
There was some discussion about weather it was necessary to drill the cylinder/piston lubriction hole in the liner, but after some problems with the exact positioning of the sloping hole to ensure that it came out below the lowest level of the scraper ring and mated up properly with the feed from the crankcase, I had the hole drilled.
After this the Comet always used a bit of oil (pint every 200/300 miles) with puffs of blue smoke sometimes and as an experiment - bearing in mind some said it was not necessary - I blanked off the oil feed in the timing cover to the cylinder.
If anything the bike seems mechanically quieter - probably because there is more oil for the crank and cam followers, and I have had no hint of the piston nipping up in the few thousand miles since - I also seem to be using a bit less oil at 400mpp.
So is it a case that with modern oils when the bike is only used for touring, this cylinder lubrication is not necessary any more ?
I am using Miller 20/50 grade oil by the way.
Matty
There was some discussion about weather it was necessary to drill the cylinder/piston lubriction hole in the liner, but after some problems with the exact positioning of the sloping hole to ensure that it came out below the lowest level of the scraper ring and mated up properly with the feed from the crankcase, I had the hole drilled.
After this the Comet always used a bit of oil (pint every 200/300 miles) with puffs of blue smoke sometimes and as an experiment - bearing in mind some said it was not necessary - I blanked off the oil feed in the timing cover to the cylinder.
If anything the bike seems mechanically quieter - probably because there is more oil for the crank and cam followers, and I have had no hint of the piston nipping up in the few thousand miles since - I also seem to be using a bit less oil at 400mpp.
So is it a case that with modern oils when the bike is only used for touring, this cylinder lubrication is not necessary any more ?
I am using Miller 20/50 grade oil by the way.
Matty