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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="Nigel Spaxman" data-source="post: 92799" data-attributes="member: 2907"><p>Tonight I took out the rocker feed bolts. I had enlarged the feed holes to 1mm last year. I think I will drill two holes 1/16" diameter in there now. I think I can enlarge those holes and it won't really make any difference to the oil flow down into the head. Now that I have inspected the whole thing it looks to me as though there is a bigger restriction where the oil has to come out of the bolt. The oil comes out two small holes at the top of the thread, Those holes are only 1/32" but from there it has to go down two tiny holes where it can oil the rocker bushing. The only oil that goes down past the rocker bushing has to get through the clearance around the rocker shaft. There is barely any clearance for the oil to get through. I think that enlarging the holes in the rocker feed bolts last year as everyone suggested was a complete waste of time! I think I will drill a 1/16" hole in the center of the rocker feed bolt. That oil will drip (or hopefully spray) on the top of the rocker arm and make it's way down the push rod tube. Where the oil goes back into the tank the hole must be around 1/4" diameter so I don't think a few holes 1/16" are going to prevent the oil getting back to the tank.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 92799, member: 2907"] Tonight I took out the rocker feed bolts. I had enlarged the feed holes to 1mm last year. I think I will drill two holes 1/16" diameter in there now. I think I can enlarge those holes and it won't really make any difference to the oil flow down into the head. Now that I have inspected the whole thing it looks to me as though there is a bigger restriction where the oil has to come out of the bolt. The oil comes out two small holes at the top of the thread, Those holes are only 1/32" but from there it has to go down two tiny holes where it can oil the rocker bushing. The only oil that goes down past the rocker bushing has to get through the clearance around the rocker shaft. There is barely any clearance for the oil to get through. I think that enlarging the holes in the rocker feed bolts last year as everyone suggested was a complete waste of time! I think I will drill a 1/16" hole in the center of the rocker feed bolt. That oil will drip (or hopefully spray) on the top of the rocker arm and make it's way down the push rod tube. Where the oil goes back into the tank the hole must be around 1/4" diameter so I don't think a few holes 1/16" are going to prevent the oil getting back to the tank. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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