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no tickover when you turn on the lights
Posted: Wed Jul 13, 2011 9:10 pm
by shilloboxer
Just changed the low voltage coil on the stator after engine stopped and no spark. Scoot now running again but when you put the lights on engine will not tickover. I have changed the light switch and the coil and checked the wiring but nothing found.
Re: no tickover when you turn on the lights
Posted: Thu Jul 14, 2011 10:57 pm
by Knowledge
When you switch on the lights, the demand for extra electricity causes drag on the flywheel and this slows the engine. If it was a bit borderline already on the tickover, the extra drag will tip it over the edge.
However, this does not explain why this has developed after the change of coil. Perhaps the magentic field does not carry enough flux to keep the spark bright and run the lights.
Try borrowing someone else's flywheel. Although I would normally recommend this without checking the timing, as you are only concerned about the tickover, it will be fine for an experiment.
Re: no tickover when you turn on the lights
Posted: Thu Jul 14, 2011 11:30 pm
by coaster
Knowledge wrote:When you switch on the lights, the demand for extra electricity causes drag on the flywheel and this slows the engine. If it was a bit borderline already on the tickover, the extra drag will tip it over the edge.
Are you sure about that Martin? I thought that the load on the stator was constant and the voltage regulator shunts excess current to earth when the lights are off
Re: no tickover when you turn on the lights
Posted: Fri Jul 15, 2011 5:27 pm
by WINTERMODEL150
Hi,from my experience its either the flywheel that needs re-magetising or the spark plug gaps too big.
Try closing the plug gap up a little and see what happens.
Dean
Re: no tickover when you turn on the lights
Posted: Sat Jul 16, 2011 11:02 am
by firekdp
coaster wrote:Are you sure about that Martin? I thought that the load on the stator was constant and the voltage regulator shunts excess current to earth when the lights are off
With a 12v regulated system that is correct, but with a standard balanced 6v system there is no load until the lights are switched on.
Out of interest, I believe, with modern SCR based regulators the load placed on the stator is greater with the lights off than with the lights on. Most aren't designed to be used without a load, especially DC types, so if not using a battery a capacitor needs to be fitted to prevent overloading the stator and reg.