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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="KennyNUT" data-source="post: 57542" data-attributes="member: 3057"><p>Thanks gents, for the continued discussion.</p><p></p><p>I have some news!</p><p></p><p>Simon Linford called me on Saturday morning (forum was down for maintenance) and told me that everything in the head was like new. He then indicated that the bike's upper cylinder liner looked a little shiny and suggested that this was fuel glazing and a quick deglaze with a glaze-busting hone and new rings and to go through the bedding-in process once again should sort the top end out. Otherwise, he declared the top end sound and suggested the big end was in great shape too as the skirt of the piston was unmarked.</p><p></p><p>All very honest of him and so this week he is sending barrel, head etc back to me for re-assembly onto the bike.</p><p></p><p>So on Saturday night, I dug around the files that came with the bike and discovered another file (I did say the bike had heaps of history with it) that indicated the bike engine and other areas of the bike were refreshed again in 1997 and then I reviewed every MOT and tax disc from 1997 to 2005 to determine that the bike has never been run in fully by the former owner! Each year the mileage recorded on the MOT form was between 6 miles in one year (I presume 3 miles is the distance to the MOT centre!) and up to 60 miles per year on occasions adding up to a total of 457 miles up to 2005. After 2005 the bike was not used and I have my notes from the purchase indicating that the previous owner, a Mr Pumford, was a motorcycle mechanic of 30 years+ and through poor health eventually let the bike go. The Comet was sold to me with just over 500 miles on the clock with the seller having performed some electrical and other work to recommission the bike before sale together with a service and MOT along with a 30 mile final test ride before I took delivery.</p><p></p><p>So that accounts for the clean oil, new piston, head work and everything else inside still like new. The bike has only done a tiny mileage since that original work in 1997. Today I went back to the piston and looked over the rings again (since I have ordered a replacement set from the VOC for re-assembly). I saw the correct oil ways behind the oil control ring, which I didn't see before as I did not play with the rings at all. One thing I did notice is that the oil control ring gap and the central ring gap were in alignment on the thrust face of the piston and I did notice that when I removed the barrel whereas the other gap to the top ring was 180 degrees on the exhaust end of the piston. I thought that was OK at the time, however, having read up a little more (again), I do not believe this to be correct. I do know the rings were not rotated upon inspection by myself and double checked this against an original photograph I took when the barrel was originally slipped off.</p><p></p><p>[ATTACH=full]3295[/ATTACH]</p><p></p><p>In the original picture (above) from when I removed the barrel, you can just make out the dark gap from the middle ring only a few degrees offset from the oil control ring (shiny spring part also just visible). This is exactly how I remember seeing it and rechecked that today as it played on my mind to check the oil ways in the piston.</p><p></p><p>Was this a small oversight or could it have rotated during installation back in 1997?</p><p></p><p>Should each ring from the first to last have the gap at 90 degrees apart with no gap above the gudgeon pin side? That is my understanding of correct fitting. I wonder if this accounts for some oil blowback into the combustion chamber?</p><p></p><p> I know the rings can move from side to side only a tiny bit but only a degree or two, perhaps. They do not twist round during operation.</p><p></p><p>What do you think?</p><p></p><p>Regards, Kenny.</p></blockquote><p></p>
[QUOTE="KennyNUT, post: 57542, member: 3057"] Thanks gents, for the continued discussion. I have some news! Simon Linford called me on Saturday morning (forum was down for maintenance) and told me that everything in the head was like new. He then indicated that the bike's upper cylinder liner looked a little shiny and suggested that this was fuel glazing and a quick deglaze with a glaze-busting hone and new rings and to go through the bedding-in process once again should sort the top end out. Otherwise, he declared the top end sound and suggested the big end was in great shape too as the skirt of the piston was unmarked. All very honest of him and so this week he is sending barrel, head etc back to me for re-assembly onto the bike. So on Saturday night, I dug around the files that came with the bike and discovered another file (I did say the bike had heaps of history with it) that indicated the bike engine and other areas of the bike were refreshed again in 1997 and then I reviewed every MOT and tax disc from 1997 to 2005 to determine that the bike has never been run in fully by the former owner! Each year the mileage recorded on the MOT form was between 6 miles in one year (I presume 3 miles is the distance to the MOT centre!) and up to 60 miles per year on occasions adding up to a total of 457 miles up to 2005. After 2005 the bike was not used and I have my notes from the purchase indicating that the previous owner, a Mr Pumford, was a motorcycle mechanic of 30 years+ and through poor health eventually let the bike go. The Comet was sold to me with just over 500 miles on the clock with the seller having performed some electrical and other work to recommission the bike before sale together with a service and MOT along with a 30 mile final test ride before I took delivery. So that accounts for the clean oil, new piston, head work and everything else inside still like new. The bike has only done a tiny mileage since that original work in 1997. Today I went back to the piston and looked over the rings again (since I have ordered a replacement set from the VOC for re-assembly). I saw the correct oil ways behind the oil control ring, which I didn't see before as I did not play with the rings at all. One thing I did notice is that the oil control ring gap and the central ring gap were in alignment on the thrust face of the piston and I did notice that when I removed the barrel whereas the other gap to the top ring was 180 degrees on the exhaust end of the piston. I thought that was OK at the time, however, having read up a little more (again), I do not believe this to be correct. I do know the rings were not rotated upon inspection by myself and double checked this against an original photograph I took when the barrel was originally slipped off. [ATTACH=full]3295[/ATTACH] In the original picture (above) from when I removed the barrel, you can just make out the dark gap from the middle ring only a few degrees offset from the oil control ring (shiny spring part also just visible). This is exactly how I remember seeing it and rechecked that today as it played on my mind to check the oil ways in the piston. Was this a small oversight or could it have rotated during installation back in 1997? Should each ring from the first to last have the gap at 90 degrees apart with no gap above the gudgeon pin side? That is my understanding of correct fitting. I wonder if this accounts for some oil blowback into the combustion chamber? I know the rings can move from side to side only a tiny bit but only a degree or two, perhaps. They do not twist round during operation. What do you think? Regards, Kenny. [/QUOTE]
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