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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
oil hole
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<blockquote data-quote="Marcus Bowden" data-source="post: 125666" data-attributes="member: 3287"><p>To really reduce wear fit a Honda step-through pump, now over 300k miles on a set of NOS Mk2 cams and stelited followers fitted 1970, maintaining a pressure of about 1 bar in the cam rail, liner lubrication blanked off 1990 when pump fitted by Harve' Hamon when sleeving my main bearing housing, pressure in the cam spindle exits the holes which are in line with cam holes on the opening side squirting oil under the follower right where it is required.</p><p> These pumps are all very similar it is just the width of the trockoidle gears inside that differ.</p><p>I do not intend buying double start pumps any more as one of these fitted will supply significantly more oil and if directed into oil filter chamber first then back to a restricted quill feed and up to cams, one could run a plain B/E like Royal Enfield.</p><p>Vincent remarked in his writings that he wished he had kept the series "A" gear pump.</p><p>bananaman.</p><p></p><p>THE PUMP NOW FITTED BIGGER CAPACITY this is from a 90cc my first was a 50cc</p><p></p><p>[URL unfurl="true"]https://www.ebay.co.uk/itm/Honda-High-Capacity-Oil-Pump-suitable-for-use-with-C50-C70-C90-Cub-90-12V-Only/192359184862?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649[/URL]</p><p></p><p>The inlet is on the RH side of pump and outlet is fed into front cylinder follower blind spindle but the banjo feeds into hollow end into cam Rail. The jet holder has had the jet removed and a 4mm ball fitted and jet replaced. If Honda pump fails what little oil pressure is coming from the main pump can still lubricate cams to a degree.</p><p>[ATTACH=full]36691[/ATTACH]</p><p>a suction pipe from inside the catchment area for main pump scavenging</p><p>[ATTACH=full]36692[/ATTACH]</p><p>weir created by tube taped and stuck into scavenge hole and end of pipe 1/4 of pipe diameter away from sump floor. As last year my weir (I believe fell over) as the thickness of the casting at the side is higher so I'm still sucking oil with Honda pump.</p><p>[ATTACH=full]36693[/ATTACH]</p><p>pipe into timing chest then plastic pipe through pipe clip (top LH bolt of idler boss)</p><p>[ATTACH=full]36694[/ATTACH]</p></blockquote><p></p>
[QUOTE="Marcus Bowden, post: 125666, member: 3287"] To really reduce wear fit a Honda step-through pump, now over 300k miles on a set of NOS Mk2 cams and stelited followers fitted 1970, maintaining a pressure of about 1 bar in the cam rail, liner lubrication blanked off 1990 when pump fitted by Harve' Hamon when sleeving my main bearing housing, pressure in the cam spindle exits the holes which are in line with cam holes on the opening side squirting oil under the follower right where it is required. These pumps are all very similar it is just the width of the trockoidle gears inside that differ. I do not intend buying double start pumps any more as one of these fitted will supply significantly more oil and if directed into oil filter chamber first then back to a restricted quill feed and up to cams, one could run a plain B/E like Royal Enfield. Vincent remarked in his writings that he wished he had kept the series "A" gear pump. bananaman. THE PUMP NOW FITTED BIGGER CAPACITY this is from a 90cc my first was a 50cc [URL unfurl="true"]https://www.ebay.co.uk/itm/Honda-High-Capacity-Oil-Pump-suitable-for-use-with-C50-C70-C90-Cub-90-12V-Only/192359184862?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649[/URL] The inlet is on the RH side of pump and outlet is fed into front cylinder follower blind spindle but the banjo feeds into hollow end into cam Rail. The jet holder has had the jet removed and a 4mm ball fitted and jet replaced. If Honda pump fails what little oil pressure is coming from the main pump can still lubricate cams to a degree. [ATTACH type="full" alt="P1040104.jpg"]36691[/ATTACH] a suction pipe from inside the catchment area for main pump scavenging [ATTACH type="full" alt="P1050263.jpg"]36692[/ATTACH] weir created by tube taped and stuck into scavenge hole and end of pipe 1/4 of pipe diameter away from sump floor. As last year my weir (I believe fell over) as the thickness of the casting at the side is higher so I'm still sucking oil with Honda pump. [ATTACH type="full" alt="P1050264.jpg"]36693[/ATTACH] pipe into timing chest then plastic pipe through pipe clip (top LH bolt of idler boss) [ATTACH type="full" alt="P1050265.jpg"]36694[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
oil hole
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