trh71 Posted May 7, 2012 Report Share Posted May 7, 2012 I got my and my lads bike out of the van, started them up (2nd kick) put my helmet on, rode down to the beck (100 yds) My bike (2001 sherco 290) was a bit choked up so i rev'd it to clear it, when the rev's droped it stalled, not wanting to start! At home i tried a new plug, no go, cleaned the carb, still no go?? Now, I've got fuel and spark, even put yet another new plug on. When i kick it over, it backfires, but won't catch and start? Ive tried it with the air box off, exhaust off, filler cap off, feels like i'm banging my head against a brick wall! I'm sure someone with more knowlage than me will know what's up with the old girl! Thanks Tim Quote Link to comment Share on other sites More sharing options...
tltel Posted May 7, 2012 Report Share Posted May 7, 2012 woodruff key could have sheared, so timing has gone out. TLTEL Quote Link to comment Share on other sites More sharing options...
trh71 Posted May 7, 2012 Author Report Share Posted May 7, 2012 would it shear just like that? seams strange. I'll get hold of a flywheel puller and have a look, thanks Quote Link to comment Share on other sites More sharing options...
tonybroad Posted May 7, 2012 Report Share Posted May 7, 2012 the key is very small and mine sheared putting my timing out so it's possible Quote Link to comment Share on other sites More sharing options...
tltel Posted May 7, 2012 Report Share Posted May 7, 2012 It shouldnt really shear that easy, but maybe if the flywheel wasnt as tight as it should be and then you reving it, it could have sheared. I had one shear on a road bike once, when I took the cover off, the flywheel nut was only finger tight. (not touched from new) The key is only there to locate, its not meant to take any strain. Might be worth checking the reeds! Hope you get it sorted. TLTEL Quote Link to comment Share on other sites More sharing options...
neo Posted May 7, 2012 Report Share Posted May 7, 2012 I know you have a spark but have you tried a brand new spark plug?... They can break down under pressure (compression). Best of luck. Neo Quote Link to comment Share on other sites More sharing options...
trh71 Posted May 8, 2012 Author Report Share Posted May 8, 2012 YES woodruff key it was!! The flywheel nut wasn't that tight, but the flywheel came off with a good pop. I'll order one, or maybe two tomorrow! Let's hope that's all it is. Thanks again guys!! Quote Link to comment Share on other sites More sharing options...
trh71 Posted May 8, 2012 Author Report Share Posted May 8, 2012 Flywheel nut 73ftlbs torque?? Thought I'd check Quote Link to comment Share on other sites More sharing options...
tltel Posted May 8, 2012 Report Share Posted May 8, 2012 Hi its always nice to be right ! Before you put it back together make sure you remove any burrs from inside the flywheel and from the taper on the shaft. Try fitting the flwheel on the shaft with out the key just to make sure it fits snug. TLTEL Quote Link to comment Share on other sites More sharing options...
ham2 Posted May 9, 2012 Report Share Posted May 9, 2012 'Lil' bit of grinding paste and lap it on but don't go at it too long as I think there has to be a slight difference in the male and female tapers. When you nip it up with the torque wrench that last turn is what binds the interference fit. IMHO Quote Link to comment Share on other sites More sharing options...
trh71 Posted May 10, 2012 Author Report Share Posted May 10, 2012 Thanks guys, she's purring like a kitten again!! I'll know where to come for help next time, there'll no doubt be one!! Quote Link to comment Share on other sites More sharing options...
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