flatout79 Posted July 1, 2012 Report Share Posted July 1, 2012 i recently bought a sherco 290 03 and before long noticed an oil leek on closer inspection noticed that a couple of the clutch cover bolts have been striped. the bolts are fine its the crankcase that has stripped anyone know how to fix without buying a new one????? Quote Link to comment Share on other sites More sharing options...
the centipede Posted July 1, 2012 Report Share Posted July 1, 2012 (edited) If there is enough meat around the bolt you may get away with helicoiling the crankcase,you can buy a kit that has the correct size drill a selection of helicoil springs a tap and the insert tool you just drill the thread out with the drill to the correct depth and retap it bigger, then insert the helicoil which is like a treaded coil/sleeve to reduce the bolt size back down to origanal.If your unsure you can get it done by a local engineering company I would imagine. http://www.amazon.co.uk/dp/B001C7P9OW/ref=asc_df_B001C7P9OW8564761?smid=A3P5ROKL5A1OLE&tag=googlecouk06-21&linkCode=asn&creative=22206&creativeASIN=B001C7P9OW Edited July 1, 2012 by the centipede Quote Link to comment Share on other sites More sharing options...
petenz Posted July 1, 2012 Report Share Posted July 1, 2012 (edited) 3 quick easy options... first see if you can use a longer bolt... there may still be good thread passed the striped thread... assumeing its a 6mm thread.. you can retap the hole for 1/4" bolt... 1/4" is .4mm bigger than 6mm.. use UNC 1/4" thread.. If the holes not to butchered it will work... done it a few times over the years.. see if you can loc-tight small studs in. Maybe combine options 2 & 3... Edited July 1, 2012 by petenz Quote Link to comment Share on other sites More sharing options...
tony27 Posted July 1, 2012 Report Share Posted July 1, 2012 Fixing stripped threads in cases is not normally a big problem, you need a M6 helicoil kit for the primary drive cover to crankcase screws or M5 for the clutch cover to primary drive cover Most bike shops & engineering firms can do this for you for a small fee if you're not confident in doing the job yourself Quote Link to comment Share on other sites More sharing options...
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