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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special
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<blockquote data-quote="greg brillus" data-source="post: 96648" data-attributes="member: 597"><p>Ben, the bike looks good...........Make a good racer..........the oil loss is not good, especially as its coming from that large breather on the timing chest, and this set up normally cures any breathing issue even on the larger twins. Perhaps empty the sump into a clean container to see how much oil ends up in there after a run, about a half a cup full is more than normal if the bike has sat for a week or so. It has a modern twin spark BTH magneto (actually a CDI unit) with external coils. The ignition timing for a twin plug set up is way less than standard, and even these figures are lower these days due to modern fuel. So for a single plug you would want 34 degrees full advance and a twin plug set up would be say 26 to 28 max. You may or may not notice if the engine is pinging (detonating) whilst riding although I have found it to be quite audible on these bikes being air cooled the noise is usually obvious. If you could hear this then that will not help with the oil loss, The BTH has an electronic advance but is the same as for a single spark ignition, and i know some members who have suffered from hard starting and poor running because the advance is too low at a given engine speed. The easier fix would be to disconnect one plug lead and its coil and run it on a single plug at 34 degrees full advance. We can describe how to do this if you are at a loss. Without knowing the internal condition of the engine, it could have piston/bore issues that will contribute to the oil loss as well. Keep asking questions and we will help as best we can. Cheers................Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 96648, member: 597"] Ben, the bike looks good...........Make a good racer..........the oil loss is not good, especially as its coming from that large breather on the timing chest, and this set up normally cures any breathing issue even on the larger twins. Perhaps empty the sump into a clean container to see how much oil ends up in there after a run, about a half a cup full is more than normal if the bike has sat for a week or so. It has a modern twin spark BTH magneto (actually a CDI unit) with external coils. The ignition timing for a twin plug set up is way less than standard, and even these figures are lower these days due to modern fuel. So for a single plug you would want 34 degrees full advance and a twin plug set up would be say 26 to 28 max. You may or may not notice if the engine is pinging (detonating) whilst riding although I have found it to be quite audible on these bikes being air cooled the noise is usually obvious. If you could hear this then that will not help with the oil loss, The BTH has an electronic advance but is the same as for a single spark ignition, and i know some members who have suffered from hard starting and poor running because the advance is too low at a given engine speed. The easier fix would be to disconnect one plug lead and its coil and run it on a single plug at 34 degrees full advance. We can describe how to do this if you are at a loss. Without knowing the internal condition of the engine, it could have piston/bore issues that will contribute to the oil loss as well. Keep asking questions and we will help as best we can. Cheers................Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special
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