Well it was raining all day today , so I completed a job on somebody else's carbs and then started work on the racebike cylinder head. Gave it a quick clean with a plastic fibre wheel in my drill. http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1444_zps725f3735.jpg Cleaned up the exhaust threads. Then before I removed the valves, I thought I'd check how well sealed to the head they already were. I poured paraffin into the inlet and then exhaust ports and then checked the combustion chambers. No paraffin at all. http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1446_zps750f0c85.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1443_zps87e3d4cc.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1445_zpsdeb4680a.jpg I removed the paraffin and then thought I'd have a look at the valve seats anyway. I found the valve spring compressor that I'd bought 30 years ago to work on my original sprint bike. http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1447_zps1db4606e.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1449_zps335bca7b.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1450_zpse6ecfc53.jpg Sure enough, the valves had recently been lapped to the head. Saving me a normally laborious job. http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1451_zps450d1355.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1453_zps513e64eb.jpg With the inlet valves out, I felt around the area where the valve seats meet the head and there was a ridge on both valve ports. I set up my Dremel type tool with it's flexible drive and ground the seal and head until there was no step all around it. http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1454_zps801dce60.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1455_zps7c8d02d8.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1457_zps98a447e8.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1458_zpsf96ea4b8.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1462_zpsbe41863f.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1464_zps0db152fa.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1470_zpsff6e3d84.jpg Was going to clean up the casting marks in the inlet ports , but it's already been done! http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1459_zps69ce4d1e.jpg http://i145.photobucket.com/albums/r240/megawattblade/All%20bike%20pix/GSX1100%20project/IMAG1465_zps1a2e3ee4.jpg I know I should grind the tops off the valve guides and blend them to the head, but I'm not that skilled with the grinding tools and I don't wanna risk doing any damage.