belldane Posted June 8, 2009 Report Share Posted June 8, 2009 Hi Got an old 247 for a song the other day ($20 Australian) except the motor had seized. Started pulling things down to get to the problem and found that the twit I bought it from must have gone into deep water, filled the crankcase with the stuff and just left it after it would not start. There is rust in the crankcase chamber and have managed to get the motor turning albeit tightly. I know the proper thing to do is to split the cases, replace bearings etc etc. but before I do that can anyone suggest how I might be able to flush all the rubbish out and getting it turning a bit lighter? If I can do this I will try to start it and see what happens. Any help much appreciated. Thanks. Quote Link to comment Share on other sites More sharing options...
totalshell Posted June 8, 2009 Report Share Posted June 8, 2009 (edited) if its being stood with water in the crankcases its nevr going to be ' loose' enough to spin freely. the surfaces of the bearings will be corroded and pitted and will break up at they turn. you may start it with a bit of luck and effort, but it will not run well or for very long. then when it does stop it will be mechanically seized because something has physically broken and jammed and that will be altogether more expensive to repair than where you are now. better to strip it now and salvage what you can. new bearings, seals, rebore, piston, rings, rod etc shoulkd get it going.. Edited June 8, 2009 by totalshell Quote Link to comment Share on other sites More sharing options...
vintagecota Posted June 8, 2009 Report Share Posted June 8, 2009 I once bought a 247 that suffered the same indignity. There's no way to fix it without replacing the bearings. Quote Link to comment Share on other sites More sharing options...
belldane Posted June 12, 2009 Author Report Share Posted June 12, 2009 Thanks for that. I knew that I had to split the cases to see what was going on but I have so many projects going on that I can hardly scratch myself. Anyway the other day I decided to do it and found that the bearing on the magneto side was absolutely stuffed. The water had leaked through the seal (the side that the bike leans to when on the stand) and ruined the bearing. The other side appears to be fine but while I have it all apart, for the sake of a few bucks, I will replace all bearings etc. I will post photos when finished. Thanks for the advice. Quote Link to comment Share on other sites More sharing options...
belldane Posted June 24, 2009 Author Report Share Posted June 24, 2009 Hi Split the cases and in process of replacing bits and pieces. In the meantime I would like to send photos of the other bikes I have restored but have never posted any before. Can someone tell what to do please? Thanks Quote Link to comment Share on other sites More sharing options...
feetupfun Posted June 24, 2009 Report Share Posted June 24, 2009 Here is the how-to guide for photos http://www.trialscentral.com/forums/index....p;f=13&id=3 If it all goes pearshaped, post you photos on the www.trials.com.au twinshock forum Quote Link to comment Share on other sites More sharing options...
thedktor Posted June 30, 2009 Report Share Posted June 30, 2009 Is the crank seal area corroded and damaged? Here are a couple of pics from my spare engine (a 349) Quote Link to comment Share on other sites More sharing options...
belldane Posted July 9, 2009 Author Report Share Posted July 9, 2009 Thank you people All is honky dory. Apart from replacing crankshaft bearings, seals and other bits and pieces, everything else is fine. Thanks for your help Quote Link to comment Share on other sites More sharing options...
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