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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston fit
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<blockquote data-quote="timetraveller" data-source="post: 5125" data-attributes="member: 456"><p>I would always put the heads on first with a little plasticine on the valve cutaways on top of the piston, enough to overlap the top side of the crescent. Assemble with cams timed correctly and tappets done up and then turn the engine over a few times. Dismantle and look at the plasticine, cutting through it with a sharp knife if required in order to look at the cross section of the plasticine. It depends upon what cams you are using and whether you are using standard sized valves. Also on whether someone has shortened the cylinder muff hight in the past. It could save a lot of time and grief later. It is not just that the valves can hit the flat in the cut aways but sometimes the cutaways are not large enough and you need to increase the radius with a scraper or sharp wood chisel. If plasticine is not a word you are familiar with it might be the same as 'play dough' but I am not sure.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 5125, member: 456"] I would always put the heads on first with a little plasticine on the valve cutaways on top of the piston, enough to overlap the top side of the crescent. Assemble with cams timed correctly and tappets done up and then turn the engine over a few times. Dismantle and look at the plasticine, cutting through it with a sharp knife if required in order to look at the cross section of the plasticine. It depends upon what cams you are using and whether you are using standard sized valves. Also on whether someone has shortened the cylinder muff hight in the past. It could save a lot of time and grief later. It is not just that the valves can hit the flat in the cut aways but sometimes the cutaways are not large enough and you need to increase the radius with a scraper or sharp wood chisel. If plasticine is not a word you are familiar with it might be the same as 'play dough' but I am not sure. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston fit
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