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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Et159
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<blockquote data-quote="GBewley" data-source="post: 14255" data-attributes="member: 583"><p>Tom,</p><p></p><p>That is indeed the way the bikes were originally set up. And I agree with your thoughts that longer hoses make for more resistance.</p><p></p><p>I think the fact is that the original setup tended to oil the machine and so a lot of folk, some years on, and deciding it (the bikes available) wasn't going to get better, so let's improve the one we have, started playing with ways of eliminating the perceived problem. PEI gave us the answer in the upward hose and enlarging the slot in the timing sleeve. Still, I contend that the combination of a very small outlet and the blowby that many of our bikes' rings allow easily overcomes the design. Fresh top ends don't have as much problem.</p><p></p><p>I originally made an extension which ended before the rear axle. On this, Mr. Stevens should have been followed as before the axle will lead to oiling the rear end whereas behind the axle leads to clean running. If they are out or new ones are required, I open up the bore of the breather spindle a bit. Doesn't take much to increase it's volume a great bit, and as it is not terribly stresses (no springs bearing, etc.) I feel safe in doing so. I also open the area of hte case around the breather spindle slot. Still, you are limited by the bore leading to the breather banjo or the part made to allow the hose to go north over the cylinders.</p><p></p><p>Bottom line is that I believe the original system was marginal. As my currently on the road twin is an 1147 or so, it has even more trouble. I tend to just let it be a bit dirty. As the cliche goes...at least it isn't rusting...</p></blockquote><p></p>
[QUOTE="GBewley, post: 14255, member: 583"] Tom, That is indeed the way the bikes were originally set up. And I agree with your thoughts that longer hoses make for more resistance. I think the fact is that the original setup tended to oil the machine and so a lot of folk, some years on, and deciding it (the bikes available) wasn't going to get better, so let's improve the one we have, started playing with ways of eliminating the perceived problem. PEI gave us the answer in the upward hose and enlarging the slot in the timing sleeve. Still, I contend that the combination of a very small outlet and the blowby that many of our bikes' rings allow easily overcomes the design. Fresh top ends don't have as much problem. I originally made an extension which ended before the rear axle. On this, Mr. Stevens should have been followed as before the axle will lead to oiling the rear end whereas behind the axle leads to clean running. If they are out or new ones are required, I open up the bore of the breather spindle a bit. Doesn't take much to increase it's volume a great bit, and as it is not terribly stresses (no springs bearing, etc.) I feel safe in doing so. I also open the area of hte case around the breather spindle slot. Still, you are limited by the bore leading to the breather banjo or the part made to allow the hose to go north over the cylinders. Bottom line is that I believe the original system was marginal. As my currently on the road twin is an 1147 or so, it has even more trouble. I tend to just let it be a bit dirty. As the cliche goes...at least it isn't rusting... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Et159
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