SlowMoe Posted October 18, 2015 Report Share Posted October 18, 2015 Can't get her to crank, there is a spark but it is very weak. The last time I rode it, it ran fine, a couple times it acted like it wanted to die for a few seconds then went back to normal. Saved up for a couple weeks, and now nothing but a very weak spark in both sides. Coil? Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted October 18, 2015 Report Share Posted October 18, 2015 Is your flywheel rusty or pickup gap really big? Quote Link to comment Share on other sites More sharing options...
lil Doobie420 Posted October 18, 2015 Report Share Posted October 18, 2015 have u tried new plugs? Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted October 19, 2015 Author Report Share Posted October 19, 2015 Tried new plugs, flywheel isn't rusty, and I'm not sure exactly what pickup gap is supposed to be but it looks good just eyeballing it; does anyone have the spec? Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted October 19, 2015 Report Share Posted October 19, 2015 .020" Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted October 20, 2015 Author Report Share Posted October 20, 2015 Gap looks fine... Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted October 20, 2015 Author Report Share Posted October 20, 2015 Could it be the pickup thingy going out? Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted October 20, 2015 Report Share Posted October 20, 2015 Could be the stator or cdi Bad ground even Did you pull the flywheel and see if its dirty inside? Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted October 20, 2015 Author Report Share Posted October 20, 2015 No, I havent Quote Link to comment Share on other sites More sharing options...
blowit Posted October 29, 2015 Report Share Posted October 29, 2015 First off, the Banshee has pretty weak spark in general. The pickup gap affects only timing and pickup intensity to trip the triggers in the CDI. It will not affect spark energy. As well, rust on the flywheel will generally not affect spark energy. The magnets in the flywheel are what generate inductive energy through the ignition coil. If the magnets are damaged, that will affect voltage output. The easiest way to troubleshoot these issues is with an oscilloscope. You would be looking for AC voltage from the ignition coil around 50-100V and approx 1V from the pickup coil. The wave frequency is dependent on RPM so most basic meters will not detect it accurately as they are tuned for 60hz AC. Once you have that established, you can examine the wave forms on the primary side of the coil which will again be around 50-100V. DO NOT connect any meter to the secondary or you will fry it. The secondary should be checked with a ohm meter. Common issues are plug caps, and wire lead terminations. Another common issue is the use of resistor plugs WITH the resistor plug caps. These two resistors will work to reduce spark energy so use a non-resistor plug if you use factory spec resistor caps. Brandon Mull Engineering Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted October 29, 2015 Report Share Posted October 29, 2015 I really have had issues with dirty flywheel and excessive pickup gap effecting spark but maybe in theory it shouldnt but real life... it does and will either foul plugs or not rev like it should. Just my experience fwiw Quote Link to comment Share on other sites More sharing options...
lil Doobie420 Posted October 29, 2015 Report Share Posted October 29, 2015 oh.... Quote Link to comment Share on other sites More sharing options...
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