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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No compression
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<blockquote data-quote="timetraveller" data-source="post: 133183" data-attributes="member: 456"><p>Take out the spark plug. Take off the two screw caps which cover the tappets. Do this carefully and if you feel some resistance, screw the cap down a little, turn the engine over half a stroke and then take the cap off. Turn the engine over so that both valves are fully shut, that is the adjusters at their minimum height and see if there is any up and down play. Ideally there should be none but when you are learning then make sure there is a thou or two up and down movement. Put the spark plug back in and then test for compression. Turn over so that there is compression and then do whatever it is that gets rid of the compression. If it is a sticky valve then you will now find that you have lots of slop in one or other of the tappets, If you have then you know which valve is sticking. If not then it is not a sticky valve problem and you might be looking for something to do with the valve lifter. If that is the case then before you take off the timing cover to delve in there, check the cable going into the rear of the timing cover which operated the valve lifter and make sure it is not hanging up on something. If nothing is obvious then come back on here with more symptoms or questions.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 133183, member: 456"] Take out the spark plug. Take off the two screw caps which cover the tappets. Do this carefully and if you feel some resistance, screw the cap down a little, turn the engine over half a stroke and then take the cap off. Turn the engine over so that both valves are fully shut, that is the adjusters at their minimum height and see if there is any up and down play. Ideally there should be none but when you are learning then make sure there is a thou or two up and down movement. Put the spark plug back in and then test for compression. Turn over so that there is compression and then do whatever it is that gets rid of the compression. If it is a sticky valve then you will now find that you have lots of slop in one or other of the tappets, If you have then you know which valve is sticking. If not then it is not a sticky valve problem and you might be looking for something to do with the valve lifter. If that is the case then before you take off the timing cover to delve in there, check the cable going into the rear of the timing cover which operated the valve lifter and make sure it is not hanging up on something. If nothing is obvious then come back on here with more symptoms or questions. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No compression
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