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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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<blockquote data-quote="greg brillus" data-source="post: 97692" data-attributes="member: 597"><p>Jerry it is a mixture of mist and splash as the oil passes down from the rocker feed bolts on the oil return pipes across the top of the head. I wonder how tight the cylinder hold down nuts were, when they are done up too tight this can distort the head and cause misalignment of the upper and lower guides, which may explain the top guide seizure. You should be able to refit the upper guide temporarily refit the valve and "Feel" some slight play sideways of the valve head in several directions. If the valve is very snug with no play, then the guides might need reaming slightly. Being air cooled they tend to need some running clearance as the engine temp climbs more so than a modern liquid cooled engine. You might be able to polish the valve stem, lubricate and assemble, and all will be fine. The cylinder head hold down nuts should be torqued to 30 to 32 Ft Lb's in an even opposite manner. Use either some oil, grease, or anti seize on the threads, and be careful to align the pushrod tubes as you lower the head back onto the barrel. Cheers and good luck..............Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 97692, member: 597"] Jerry it is a mixture of mist and splash as the oil passes down from the rocker feed bolts on the oil return pipes across the top of the head. I wonder how tight the cylinder hold down nuts were, when they are done up too tight this can distort the head and cause misalignment of the upper and lower guides, which may explain the top guide seizure. You should be able to refit the upper guide temporarily refit the valve and "Feel" some slight play sideways of the valve head in several directions. If the valve is very snug with no play, then the guides might need reaming slightly. Being air cooled they tend to need some running clearance as the engine temp climbs more so than a modern liquid cooled engine. You might be able to polish the valve stem, lubricate and assemble, and all will be fine. The cylinder head hold down nuts should be torqued to 30 to 32 Ft Lb's in an even opposite manner. Use either some oil, grease, or anti seize on the threads, and be careful to align the pushrod tubes as you lower the head back onto the barrel. Cheers and good luck..............Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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