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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve piston clash
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<blockquote data-quote="b'knighted" data-source="post: 52724" data-attributes="member: 59"><p>Probably not David's problem but decades ago I made a mistake which didn't fail for hundreds of miles. I managed to insert the rear inlet rocker arm too low. It flicked the collar ET35 upwards off the step and operated the valve by working just on the increased diameter until the forked end cracked and jammed on the larger diameter holding the valve open. I was two up on the way home from a Liphook meet when, to steals David's description, it sounded like a Comet but with the power of an allotment wheelbarrow! David may have overestimated the power of a twin running on a single cylinder.</p><p></p><p>Although adjustment will show the experienced assembler that the rocker adjuster is screwed in too far, (it may need the locknut moved to under the rocker) the rocker may contact the top of the lower valve guide earlier than the collar would.</p><p></p><p>It is something else to check out before lifting the heads.</p></blockquote><p></p>
[QUOTE="b'knighted, post: 52724, member: 59"] Probably not David's problem but decades ago I made a mistake which didn't fail for hundreds of miles. I managed to insert the rear inlet rocker arm too low. It flicked the collar ET35 upwards off the step and operated the valve by working just on the increased diameter until the forked end cracked and jammed on the larger diameter holding the valve open. I was two up on the way home from a Liphook meet when, to steals David's description, it sounded like a Comet but with the power of an allotment wheelbarrow! David may have overestimated the power of a twin running on a single cylinder. Although adjustment will show the experienced assembler that the rocker adjuster is screwed in too far, (it may need the locknut moved to under the rocker) the rocker may contact the top of the lower valve guide earlier than the collar would. It is something else to check out before lifting the heads. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve piston clash
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