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2010 St 3.0 Works Replica Sherco Big Bang And Wont Start


tpmadhare
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Hi there really need some help I just brought a 2010 sherco st 3.0 works replica when I went to view it last weekend seemed to be fine run OK rode OK etc got it home put it away all week got it out to ride today fired up ran OK for 10 min then started to die on lower rpm til it cut out found out it was flooding took carb apart found floats where sticking cleaned refitted seem OK led it ticking over for ten min then went to ride it pulled away and bang big backfire flames out the exhuast now won't start got spark got fuel got good comprestion 150 psi on tester all it dose is back fire with flames wont start any ideas please

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Big bang, Probably sheered the woodruff key on flywheel. If it went bang because of too much fuel it can make the

engine fire backwards while the flywheel momentum is going forwards and the key gets sheered.

TLTEL

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Make sure there is no damage to either taper, if there is then a you'll need to remove it so the tapers lock together properly.

A bit of fine wet & dry will work for the crank, using some fine lapping compound between the 2 parts in a twisting motion will match them up, don't go mad on it though as the flywheel will move inwards on the crank if you overdo it

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If the flywheel nut was not properly tightened, the flywheel will move slightly on the shaft and eventually shear the woodruff key. When that happens, the timing goes way out and often results in a storing kick back or simply not starting.

Usually simply , clean up the shaft and bore if they are scored, replace the key and you are back riding.

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