Hedgehog Posted February 24, 2019 Share Posted February 24, 2019 Stuck valves on 1983 katana 650g on 2 cylinders any ideas for a fix other than head off, frees itself now and again bike has stood for 10 years. I've changed oil and filter, when I laid her up I put oil in the cylinders so the rings are free it's definitely the valves, difficult to start and popping from the exhaust. Quote Link to comment
Gixer1460 Posted February 24, 2019 Share Posted February 24, 2019 Having never experienced this I can only think bent stems or massive corrosion on stems or seats. So if you can get it started it may benefit from an 'Italian Tune-up' or if not, i'd top end strip it to check it! Quote Link to comment
bluedog59 Posted February 24, 2019 Share Posted February 24, 2019 Have you taken the cam cover off and turned it over by hand to check ? Quote Link to comment
Hedgehog Posted February 25, 2019 Author Share Posted February 25, 2019 I thought it might clear itself as this wasn't a problem when I laid the bike up, I had a suggestion to put a small quantity of Dextron in the fuel and run it this might clear it, but my next job is to take the valve cover off and inspect the valve tolerance. Quote Link to comment
Hedgehog Posted February 28, 2019 Author Share Posted February 28, 2019 Had valve cover off, 3 valves are so tight I can't get a feeler gauge under them I've got the shims out 2 of them are 2.60mm and 1 2.50mm I've put the 2.50 in 1 off the 2.60 slots and can get a 5mm feeler gauge so in tolerance, so now looking for 2 more 2.50 shims any suggestions the best suppliers. Quote Link to comment
Askamaskinservice Posted March 1, 2019 Share Posted March 1, 2019 8 hours ago, Hedgehog said: Had valve cover off, 3 valves are so tight I can't get a feeler gauge under them I've got the shims out 2 of them are 2.60mm and 1 2.50mm I've put the 2.50 in 1 off the 2.60 slots and can get a 5mm feeler gauge so in tolerance, so now looking for 2 more 2.50 shims any suggestions the best suppliers. I have absolutely no idea what you just wrote, maybe it's just my head.... Robinsonfoundry seems like peoples 1 place to go to. Quote Link to comment
Swiss Toni Posted March 1, 2019 Share Posted March 1, 2019 (edited) For the time it's going to take ... whip the head off! Things of this nature don't usually 'clear themselves', 'Sods Law' it'll catch you out! You could take the cams out, and try pushing/tapping the top of the valve stems. If the valve returns, that's not the problem, if it doesn't, it's either bent stem or corrosion, as said! Edited March 1, 2019 by Swiss Toni Quote Link to comment
Hedgehog Posted March 3, 2019 Author Share Posted March 3, 2019 Cheers, valves are free! awaiting 2 valve shims. Quote Link to comment
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