gasgas249uk Posted January 18, 2007 Report Share Posted January 18, 2007 (edited) Just 2 questions folks What is the spring weight in lbs for a standard trials bike for Mr average weight - 12.5st ish How can aluminium from a siezed piston be removed safely from a nicosil barrel without damaging the nicosil with emery cloth ? Thanks as always Edited January 18, 2007 by gasgas249uk Quote Link to comment Share on other sites More sharing options...
sdc Posted January 18, 2007 Report Share Posted January 18, 2007 The chromium barrel is far harder than the aluminium piston left on it so fine emery paper will do no harm. The effect of the piston seizing will already have done some damage but don't make it worse with vertical strokes, use lateral ones. Chances are the the damage will be below the exhaust port so don't worry - it'll be fine. Quote Link to comment Share on other sites More sharing options...
copemech Posted January 19, 2007 Report Share Posted January 19, 2007 a 50/50 DILUTION OF MURATIC(SWIMMING POOL) ACID AND WATER WILL DISSOLVE THE ALUMINUM. aDD ACID TO WATER, NOT THE OTHER WAY AROUND, Oops, caps lock! Quote Link to comment Share on other sites More sharing options...
lineaway Posted January 19, 2007 Report Share Posted January 19, 2007 If my memory is correct. Hydrocloric acid will remove or help to flake off the aluminum. Somebody on this forum will confirm or correct my thoughts. Quote Link to comment Share on other sites More sharing options...
copemech Posted January 19, 2007 Report Share Posted January 19, 2007 Same stuff, different dilution, what he said! Quote Link to comment Share on other sites More sharing options...
rlracer Posted January 19, 2007 Report Share Posted January 19, 2007 What Cope said. I've done it before, just take your time. Quote Link to comment Share on other sites More sharing options...
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