nath15804 Posted October 11, 2010 Report Share Posted October 11, 2010 Hi, i have recently been told ( by a mechanic) that my cylinder head on my gasgas jtr370 needs skimming but hes not sure whether you can do it on these models because of a groove or something, can anyone shed any light on this situation, i would be very greatful. nath Quote Link to comment Share on other sites More sharing options...
gii Posted October 11, 2010 Report Share Posted October 11, 2010 How distorted is it? If it's not much you could try lapping it flat with grinding paste on a piece of glass On a bike of that age and value, I'd be more inclined to try a couple of new o rings and a healthy application of good quality silicone before I paid someone to skim it. Quote Link to comment Share on other sites More sharing options...
nath15804 Posted October 11, 2010 Author Report Share Posted October 11, 2010 How distorted is it? If it's not much you could try lapping it flat with grinding paste on a piece of glass On a bike of that age and value, I'd be more inclined to try a couple of new o rings and a healthy application of good quality silicone before I paid someone to skim it. Cheers, what do ye mean by lapping it with the glass? Quote Link to comment Share on other sites More sharing options...
nath15804 Posted October 11, 2010 Author Report Share Posted October 11, 2010 How distorted is it? If it's not much you could try lapping it flat with grinding paste on a piece of glass On a bike of that age and value, I'd be more inclined to try a couple of new o rings and a healthy application of good quality silicone before I paid someone to skim it. He has said it is a tenth of a mill out by the way Quote Link to comment Share on other sites More sharing options...
monty_jon Posted October 11, 2010 Report Share Posted October 11, 2010 Place the head on a piece of Very fine wet & dry on top of a sheet of thick glass or a surface table Move the head in a figure of 8 a few time then rotate the head 90 Quote Link to comment Share on other sites More sharing options...
monty_jon Posted October 11, 2010 Report Share Posted October 11, 2010 (edited) 0.10mm shouldn't cause any problems anyway, the head bolts will pull that flat! Edited October 11, 2010 by Monty_Jon Quote Link to comment Share on other sites More sharing options...
nath15804 Posted October 11, 2010 Author Report Share Posted October 11, 2010 Place the head on a piece of Very fine wet & dry on top of a sheet of thick glass or a surface table Move the head in a figure of 8 a few time then rotate the head 90 Quote Link to comment Share on other sites More sharing options...
monty_jon Posted October 11, 2010 Report Share Posted October 11, 2010 (edited) On a bike of that age and value, I'd be more inclined to try a couple of new o rings and a healthy application of good quality silicone before I paid someone to skim it. 0.10mm is nothing on a single, tighten it properly with new O rings as GII says it should sort it out Edited October 11, 2010 by Monty_Jon Quote Link to comment Share on other sites More sharing options...
nath15804 Posted October 11, 2010 Author Report Share Posted October 11, 2010 0.10mm is nothing on a single, tighten it properly with new Quote Link to comment Share on other sites More sharing options...
jse Posted October 12, 2010 Report Share Posted October 12, 2010 Place the head on a piece of Very fine wet & dry on top of a sheet of thick glass or a surface table Move the head in a figure of 8 a few time then rotate the head 90 Quote Link to comment Share on other sites More sharing options...
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