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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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<blockquote data-quote="ClassicBiker" data-source="post: 106824" data-attributes="member: 1632"><p>Well personal circumstance didn't allow me to tear into the motor and find the cause of the problem. So I have resurrected this thread to bring everyone up to date. In another thread I mentioned I had purchased the new extended rockers to install when I figured out what was going on with the sudden smoking. Well over the Easter weekend I pulled the heads. Bur first I started the Shadow to see if by some miracle it had healed itself. Not. So I made a by pass on the oil line to the heads and rockers. That stopped the smoking and lead me to believe that the cause was an worn guide allowing excess oil into the cylinder and/or exhaust causing the smoking. When I removed the muffler/silencer I heard a rattle. I thought it was the baffle loose inside. Until a little something fell out. At first glance it appeared to be a lump of carbon. Closer inspection revealed it was metal. In fact it had a curve to it. I looked up the inlets and exhausts of both heads and could see the top of all the valve guides, except the front exhaust. I could see the valve guide retainers, except the front exhaust. This did not bode well. With both heads off, I removed the valves from the front head. The lower guide is completely gone. The little bit of shrapnel I found in the exhaust is all that remains. The threads for the guide retainer are completely fretted away, only the retainer remains.</p><p>Now I have to decide whether to repair the head by the methods I have seen on the forum of making an insert to retain the lower guide or purchase a new head. But first I must determine if the hole for the lower guide has been worn excessively or not. Does anyone know the standard o.d. of a lower guide?</p><p>Of interest the upper guide appears to have been sufficient to keep the valve aligned as there doesn't appear to be any damage to the valve or head in the seat area.</p><p>Steven</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 106824, member: 1632"] Well personal circumstance didn't allow me to tear into the motor and find the cause of the problem. So I have resurrected this thread to bring everyone up to date. In another thread I mentioned I had purchased the new extended rockers to install when I figured out what was going on with the sudden smoking. Well over the Easter weekend I pulled the heads. Bur first I started the Shadow to see if by some miracle it had healed itself. Not. So I made a by pass on the oil line to the heads and rockers. That stopped the smoking and lead me to believe that the cause was an worn guide allowing excess oil into the cylinder and/or exhaust causing the smoking. When I removed the muffler/silencer I heard a rattle. I thought it was the baffle loose inside. Until a little something fell out. At first glance it appeared to be a lump of carbon. Closer inspection revealed it was metal. In fact it had a curve to it. I looked up the inlets and exhausts of both heads and could see the top of all the valve guides, except the front exhaust. I could see the valve guide retainers, except the front exhaust. This did not bode well. With both heads off, I removed the valves from the front head. The lower guide is completely gone. The little bit of shrapnel I found in the exhaust is all that remains. The threads for the guide retainer are completely fretted away, only the retainer remains. Now I have to decide whether to repair the head by the methods I have seen on the forum of making an insert to retain the lower guide or purchase a new head. But first I must determine if the hole for the lower guide has been worn excessively or not. Does anyone know the standard o.d. of a lower guide? Of interest the upper guide appears to have been sufficient to keep the valve aligned as there doesn't appear to be any damage to the valve or head in the seat area. Steven [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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