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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather Timing: A long description of a different way (Part 1)
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<blockquote data-quote="Monkeypants" data-source="post: 103233" data-attributes="member: 2708"><p>My OZ Rapide was quite oil tight until I took it apart this winter.</p><p>I took the top end apart to find out where all the compression had gone and to fix a very slight oil weep at one cylinder stud.</p><p>I figured that after lots of hard miles it would need a rebore and new valves etc.</p><p>Happily, I was wrong about that!</p><p></p><p>Got the compression back by lapping the valves ( carbon deposits on valve seats) and fixed the leaking stud. Also created about six new leaks!</p><p>Now the one by one leak elimination process begins.</p><p>I seem to go through this every time I touch something on the bike.</p><p>Can't complain, 55,000 miles covered since the top end was last apart. John McDougall put all the good stuff in it at that time and there is still virtually no wear in there. The valve stems( Kemp's tuftrided and stellited ) measure and look as new.</p><p>The cylinders ( Terry Prince supplied sleeves) haven't any ridge at top, still a bit of cross hatch showing and measure less than 1 thou total taper.</p><p>Hastings the ring people say it needs a rebore at 12 thou taper. Ive got some riding to do!</p><p>Honda Chrome rings in there too.</p><p></p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 103233, member: 2708"] My OZ Rapide was quite oil tight until I took it apart this winter. I took the top end apart to find out where all the compression had gone and to fix a very slight oil weep at one cylinder stud. I figured that after lots of hard miles it would need a rebore and new valves etc. Happily, I was wrong about that! Got the compression back by lapping the valves ( carbon deposits on valve seats) and fixed the leaking stud. Also created about six new leaks! Now the one by one leak elimination process begins. I seem to go through this every time I touch something on the bike. Can't complain, 55,000 miles covered since the top end was last apart. John McDougall put all the good stuff in it at that time and there is still virtually no wear in there. The valve stems( Kemp's tuftrided and stellited ) measure and look as new. The cylinders ( Terry Prince supplied sleeves) haven't any ridge at top, still a bit of cross hatch showing and measure less than 1 thou total taper. Hastings the ring people say it needs a rebore at 12 thou taper. Ive got some riding to do! Honda Chrome rings in there too. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather Timing: A long description of a different way (Part 1)
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