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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Tank Breather Advice
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<blockquote data-quote="BigEd" data-source="post: 154717" data-attributes="member: 161"><p>The breather on the front exhaust spring cap was fitted to later models. The cylinder head was also altered by creating a better passage from where the exhaust spring is into the cap. I modified the front head on my Rapide to provide a path for the engine to breathe through. You can do this by hand with a round file or a rotary cutter but it needs to have the head off. You can see photographs of this earlier in this thread, post #24 by oexing. I have a 'D' cap fitted with a breather pipe to the rear of the bike. It has a small non-return valve fitted near to the cap. I have blanked off the timed breather. Good breathers help reduce leaks but if the engine is worn blow-by past the piston makes the breathers work hard so a good breather system is not guaranteed to fix all leaks.</p><p>It is worthwhile checking the timing of the timed breather. I think the instructions/numbers are in Richardson if you have the book. You don't need to dismantle the timing side to do this. You can blow through the breather pipe to see when it opens or closes. A timing disc is fitted by removing the brass OP9/2 found near the bottom of the timing cover. A timing disc can be mounted on a piece of 1/4" round bar with the end ground to a very shallow taper can then be tapped gently into the hole in the hollow mainshaft.</p><p></p><p>The breather valve I have fitted is similar to the one sold by Ben Kingham. He fits them on his racers to great effect. It is inexpensive and y can see it/buy it on his BSK SpeedWorks website: <span style="color: rgb(44, 130, 201)"><a href="https://www.bskspeedworks.co.uk/pcv-valve.html" target="_blank"><u><strong>PCV valve link</strong></u></a></span></p></blockquote><p></p>
[QUOTE="BigEd, post: 154717, member: 161"] The breather on the front exhaust spring cap was fitted to later models. The cylinder head was also altered by creating a better passage from where the exhaust spring is into the cap. I modified the front head on my Rapide to provide a path for the engine to breathe through. You can do this by hand with a round file or a rotary cutter but it needs to have the head off. You can see photographs of this earlier in this thread, post #24 by oexing. I have a 'D' cap fitted with a breather pipe to the rear of the bike. It has a small non-return valve fitted near to the cap. I have blanked off the timed breather. Good breathers help reduce leaks but if the engine is worn blow-by past the piston makes the breathers work hard so a good breather system is not guaranteed to fix all leaks. It is worthwhile checking the timing of the timed breather. I think the instructions/numbers are in Richardson if you have the book. You don't need to dismantle the timing side to do this. You can blow through the breather pipe to see when it opens or closes. A timing disc is fitted by removing the brass OP9/2 found near the bottom of the timing cover. A timing disc can be mounted on a piece of 1/4" round bar with the end ground to a very shallow taper can then be tapped gently into the hole in the hollow mainshaft. The breather valve I have fitted is similar to the one sold by Ben Kingham. He fits them on his racers to great effect. It is inexpensive and y can see it/buy it on his BSK SpeedWorks website: [COLOR=rgb(44, 130, 201)][URL='https://www.bskspeedworks.co.uk/pcv-valve.html'][U][B]PCV valve link[/B][/U][/URL][/COLOR] [/QUOTE]
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The Series 'A' Rapide was known as the '********' Nightmare?
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Tank Breather Advice
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