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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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<blockquote data-quote="Matty" data-source="post: 59412" data-attributes="member: 1339"><p>Hi All</p><p> </p><p>I had blanked off the oil feed to the Comet Cylinder by putting a plastic disc behind the feed in the timing cover. Do not do this on a twin - you will cut off the oil supply to the cams etc.</p><p>I dd this many years ago to try to cure a smokey exhaust problem but it had no effect and neither did I have any siezure problems.</p><p> </p><p>Have now had my rebore and new piston and at first there was no smoke. However now after around 4X 20 mile runs at 40/50mph, it smokes badly (the weather is frosty, salt on roads, and I am 79 so I only did short runs) !!!</p><p> </p><p>Tried disconnecting the oil return and taking it via a pipe to the oil tank, to miss out the valve gear for a few minutes and it still blows out smoke,</p><p>so conclude problem is with the bore/piston not valve guides, which in any case looked very good and have only done 3000miles or so. </p><p> </p><p>Compression is very good, but I think the bore must have glazed up (I took great care that the piston circlips were in correctly so do not think this is the problem)</p><p> </p><p>Obviously I do not want to pull it apart again if possible, but if it is glazed, are ther any magic cures or should I just drive it harder for while to try to bed the rings in.</p><p> </p><p>If it is glazed and I have to have the bore honed to de-glaze it how should I run the bike in to avoid this problem happening again ?</p><p> </p><p>Will post this again as a separate item because Glazing may be of general interest. I think I had the same problem about 10 years ago after a rebore but can not remember the details.</p><p> </p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 59412, member: 1339"] Hi All I had blanked off the oil feed to the Comet Cylinder by putting a plastic disc behind the feed in the timing cover. Do not do this on a twin - you will cut off the oil supply to the cams etc. I dd this many years ago to try to cure a smokey exhaust problem but it had no effect and neither did I have any siezure problems. Have now had my rebore and new piston and at first there was no smoke. However now after around 4X 20 mile runs at 40/50mph, it smokes badly (the weather is frosty, salt on roads, and I am 79 so I only did short runs) !!! Tried disconnecting the oil return and taking it via a pipe to the oil tank, to miss out the valve gear for a few minutes and it still blows out smoke, so conclude problem is with the bore/piston not valve guides, which in any case looked very good and have only done 3000miles or so. Compression is very good, but I think the bore must have glazed up (I took great care that the piston circlips were in correctly so do not think this is the problem) Obviously I do not want to pull it apart again if possible, but if it is glazed, are ther any magic cures or should I just drive it harder for while to try to bed the rings in. If it is glazed and I have to have the bore honed to de-glaze it how should I run the bike in to avoid this problem happening again ? Will post this again as a separate item because Glazing may be of general interest. I think I had the same problem about 10 years ago after a rebore but can not remember the details. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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