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Only a few reasons.. if engine not turning over at all its seized motor, it could be a bent valve and stopping the piston from completing its full stroke. or a piston rod. If engine turns over and not starting it could be fuel, electrical, or carbies jets, or valve timing.
my gpz 1000rx 1986 would start and rev fine but die on pull away, for weeks tried allsorts (carbs cleaned, plugs changed etc) Solution for me was WD40 the sidestand switch and tighten earth lead from battery where it bolts to engine block, now its fine. Hope this helps WAZZA
17 is correct Frank mesured from the base of the carburetor. Meaning the flat surface that the bowl bolts to, from the part of the float furthest away. With the needle just touching the seat. If you have set this correctly and are not getting fuel the next thing to check is that the needle and seat are not binding with a bit of grit (rarely happens) or that there is a problem with the petcock or filter. If it is vacume operated try sucking the vacume tume and see if fuel runs out of the hose into a container at a decent flow rate. If not vacume operated check the flow into a container when the tap is turned on. lastly check the fuel line does not have a kink or collapse caused by inferior line type or sharp bend. Hope you get it going soon mate.
A service manual is a valuable tool with an aging bike. I suggest the
dealer/mfr. or Clymer books. In the meantime, go to the library
reference section...646 stacks should have what you need.
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