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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fuel Tap Leak
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<blockquote data-quote="paulpackman" data-source="post: 50640" data-attributes="member: 1804"><p>For many years every winter I have lapped in my petrol taps with Autosol mettle polish.</p><p>The taps are the tapered brass type with a corrugated spring below the lever to ensure engagement of the</p><p>tapered brass plug into the brass body. All held together with an internal circlip.</p><p>I used to knock the pin out that retained the lever, remove the circlip and lap the tapered plug into the body</p><p>of the tap with a small electric drill and a spot of Autosol cleaning thoroughly after before reassembly. </p><p>The taps were petrol tight for about a year before they needed another regrind.</p><p>A couple of years ago I turned a small groove in the outer (larger) end of the tapered plugs and fitted small</p><p>O rings in them which has stopped external leakage from the taps. However I have found that the groove has to be</p><p>dead true to the valve stem and of precise depth otherwise the O ring will hold off the tapered plug against</p><p>its engagement spring and petrol will leek to the carburettor. Get it right and it works a treat.</p><p>No more grinding (I hope !)</p></blockquote><p></p>
[QUOTE="paulpackman, post: 50640, member: 1804"] For many years every winter I have lapped in my petrol taps with Autosol mettle polish. The taps are the tapered brass type with a corrugated spring below the lever to ensure engagement of the tapered brass plug into the brass body. All held together with an internal circlip. I used to knock the pin out that retained the lever, remove the circlip and lap the tapered plug into the body of the tap with a small electric drill and a spot of Autosol cleaning thoroughly after before reassembly. The taps were petrol tight for about a year before they needed another regrind. A couple of years ago I turned a small groove in the outer (larger) end of the tapered plugs and fitted small O rings in them which has stopped external leakage from the taps. However I have found that the groove has to be dead true to the valve stem and of precise depth otherwise the O ring will hold off the tapered plug against its engagement spring and petrol will leek to the carburettor. Get it right and it works a treat. No more grinding (I hope !) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fuel Tap Leak
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