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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Power Arc Ignitions
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<blockquote data-quote="timetraveller" data-source="post: 124086" data-attributes="member: 456"><p>Peter, it can be fairly subtle. It is often not the face of the valve hitting the top of the piston cut outs. It is the edge of the valve just hitting the side of the cut out on top of the piston, sometimes only by thous. I have generally only discovered this after dismantling the top end of various bikes. Same with the ET35s on the valve stem. A thou is enough to cause trouble but if the engine is spinning then the inertia of the flywheels can take it past the contact point. I always enlarge the diameter of the top of piston cut outs and make sure that there is clearance on the valves by getting to maximum lift and then levering up the tappet end of the rocker to make sure there is clearance.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 124086, member: 456"] Peter, it can be fairly subtle. It is often not the face of the valve hitting the top of the piston cut outs. It is the edge of the valve just hitting the side of the cut out on top of the piston, sometimes only by thous. I have generally only discovered this after dismantling the top end of various bikes. Same with the ET35s on the valve stem. A thou is enough to cause trouble but if the engine is spinning then the inertia of the flywheels can take it past the contact point. I always enlarge the diameter of the top of piston cut outs and make sure that there is clearance on the valves by getting to maximum lift and then levering up the tappet end of the rocker to make sure there is clearance. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Power Arc Ignitions
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