Originally Posted by
OddDuck
Change fuel - unleaded has a nasty habit of going off if sitting for a few weeks
Check kill switch contact resistance and loom wiring - have a look at voltage delivered to the coils while energised - if this is low due to resistances adding up in the wiring then it'll affect the ignition
Check valve tappet clearances
Get to inner spark plugs and check insulators on all plugs for carbon fouling
Check that all spark plugs are tight!
Check compression, all cylinders
Check air filter for holes or bad sealing - any air gap will badly lean out the mixture and make starting a nightmare - on that note also go looking for vacuum leaks through the inlet manifolds. If there's O-rings sealing the manifolds to the cylinder heads then these can flow and set over time and gradually fail to vacuum seal properly.
Good luck and let us know how it goes?
If the OP was capable of checking all of that ... it's unlikely he would have asked in these forums.
Probably his best move is to take it to a motorcycle mechanic ...
When life throws you a curve ... Lean into it ...
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