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Hi my mate has just purchased a 600 dominator and joined the club but is not yet conversant with the procedure to post a problem so ive done it for him. The bike when cold starts first or second kick  and runs ticks over lovely When hot is a mare to get going. if you take it for a ride 1/2 hour leave for 5 mins and try to start it it will not fire. Leave it for 1/2 hour or more it will start again  Any ideas appreciated Regards G  
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Check you haven't lost the spark? is the coil Hot? Is the carbon brush in the dizzy cap stuck? Is the air hole in the petrol cap blocked?
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As Al says check the spark. Very common problem with an old magneto.  Easy cold start and fine when engine running.  However once engine stopped there is no chance of starting again until everything has cooled down.  The capacitor inside the magneto is the problem.  Rebuild magneto [Paul Wolf] or electronic ignition [preferred].
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Does sound like possible bad condenser, but some bikes need a press on the carburettor tickler for starting under the circumstances you describe.
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OH yea? How is it there is the cry of EI every time a mag misbehaves? The cost of EI can be as much as the cost of a mag rebuild-£400. With EI you need to fit an ignition switch, you are now totally reliant on a decent battery and battery charging. Conversion to 12V is preferred. Is the dynamo up to it? An alternator will have sufficient power.
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I replaced my Concentrics with the correct Monoblocs.  When hot, I now need to give it a lot of throttle opening...which Amals don't usually want on starting.  (I must sort out the pilot screw.  But drawback with monoblocs is poor access) it starts starts normally when cold
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Irregular usage makes it difficult to get the tuning just right. I have  given the pilot screw a half turn (in or out) and used the bike for a few runs and checked the plug condition . Even a quarter turn out of the pilot screw can clean up the plug . and the bike will go from a reluctant warm starter to a first kick   warm starter with just a quarter turn outwards (anti clock) . Summer and winter require a slightly different setting. A new carb makes a huge difference to the reliability of the idle .

 


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