July 1, 201214 yr 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?????
July 1, 201214 yr 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, 201214 yr by the centipede
July 1, 201214 yr 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, 201214 yr by petenz
July 1, 201214 yr 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
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