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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
B cylinder oil hole vs C cylinder oil hole
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<blockquote data-quote="aldeburgh" data-source="post: 54163" data-attributes="member: 2692"><p>Many words , measurements ,angles and pictures. </p><p>Getting back to basics , when I was puzzling over where to drill the hole I fitted the piston to the rod with only the oil ring on it , I then smeared grease inside the cylinder bore and fed it over the piston until the oil ring was just into the bottom of it.</p><p>Next I turned the crank to BDC while allowing the barrel to drop with it<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /> and finally pushed the barrel onto the crankcase , then lifting the barrel reveals the position of the oil ring marked by the grease<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />. I then drilled through 3/16" below this point at an angle and filed a flat on the outside face , I then drilled two extra oil holes on the "upper side" of the liner <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> to get more "splashed" oil to the lower piston skirt. Belt & Braces as they say around here<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="aldeburgh, post: 54163, member: 2692"] Many words , measurements ,angles and pictures. Getting back to basics , when I was puzzling over where to drill the hole I fitted the piston to the rod with only the oil ring on it , I then smeared grease inside the cylinder bore and fed it over the piston until the oil ring was just into the bottom of it. Next I turned the crank to BDC while allowing the barrel to drop with it:confused: and finally pushed the barrel onto the crankcase , then lifting the barrel reveals the position of the oil ring marked by the grease:D. I then drilled through 3/16" below this point at an angle and filed a flat on the outside face , I then drilled two extra oil holes on the "upper side" of the liner :eek: to get more "splashed" oil to the lower piston skirt. Belt & Braces as they say around here;) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
B cylinder oil hole vs C cylinder oil hole
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