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 Post subject: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 2:45 pm 
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Okay fellas. I got the hammerhead running. I switched out the blown 150cc engine with another from a scooter. I didnt have spark for the longest time. Once I moved the old stator from the blown engine into the scooter engine, it worked. I bought a dc cdi but when I hook it up, I lose spark. Thats the issue I have now. I want to add a no rev cdi and leds to the buggy. I dont want to end up ordering parts I cannot use. If it turns out that this buggy is an ac unit, how can I run LEDS and how can I determine if its DC or AC?

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 3:24 pm 
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with buggies, the easiest way to determine AC or DC is to turn the key on and turn the lights on. if they come on, it's a DC system. If you need to have the buggy running to get the lights to work then it's an AC system.

hope that helps.

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 3:38 pm 
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If the red/black lead is being used off the stator, it is an AC powered CDI. If still in doubt, measure the voltage for AC or DC output at the CDI power pin while cranking the engine.

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 3:48 pm 
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kid4life wrote:
with buggies, the easiest way to determine AC or DC is to turn the key on and turn the lights on. if they come on, it's a DC system. If you need to have the buggy running to get the lights to work then it's an AC system.

hope that helps.


Yeah, problem being is this thing was a basket case. No lights to begin with. Actually there was one light but no wires to or from the stator or battery. I'm fairly sure its an AC system from what little research I've done on the plugs. I imagine its safe to wire leds directly to the battery with an inline fuse.

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 3:53 pm 
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The small 4-pin rectifier only puts out enough DC to keep the battery charged. If you plan to run a constant DC load (LED lights), use the larger rectifier off a 250cc buggy that uses two pigtails.

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 4:14 pm 
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PGH wrote:
The small 4-pin rectifier only puts out enough DC to keep the battery charged. If you plan to run a constant DC load (LED lights), use the larger rectifier off a 250cc buggy that uses two pigtails.


Will the stock harness still plug into the 250cc rectifier or will I need to rewire everything? Would it not be better to upgrade to an 11 pole stator?

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 4:25 pm 
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the hammerheads are dc fired cdi, so when you plug in the harness from the stator to the harness on the buggy you should still have a dc system. the black wire with the red stripe is not used on the hammerhead harness

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 Post subject: Re: DC or AC CDI?
PostPosted: Fri Aug 24, 2012 4:38 pm 
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You will need to rewire the rectifier plugs since they do not match - Buggy Depot does have an adapter cable that does what you need if you are not comfortable with rewiring. Whether you upgrade stators depends on how much electrical load you plan to run. If you keep your total load under 75w (6A), a 6-pole stator will handle it. The 250cc rectifier allows for up to three phases of AC input. Only the 11-pole GY6 stator has three, but 2-phase 6-pole and 8-pole stators will work fine with the upgraded rectifier.

BTW: Most scooters have an 8-pole stator capable of over 100w (8A), so you may have enough capacity for what you need. There is no way to check if you eight poles or six without pulling the flywheel and counting the windings.

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 Post subject: Re: DC or AC CDI?
PostPosted: Sat Aug 25, 2012 2:51 pm 
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PGH wrote:
You will need to rewire the rectifier plugs since they do not match - Buggy Depot does have an adapter cable that does what you need if you are not comfortable with rewiring. Whether you upgrade stators depends on how much electrical load you plan to run. If you keep your total load under 75w (6A), a 6-pole stator will handle it. The 250cc rectifier allows for up to three phases of AC input. Only the 11-pole GY6 stator has three, but 2-phase 6-pole and 8-pole stators will work fine with the upgraded rectifier.

BTW: Most scooters have an 8-pole stator capable of over 100w (8A), so you may have enough capacity for what you need. There is no way to check if you eight poles or six without pulling the flywheel and counting the windings.


Well I had bought a scooter engine to replace the blown hammerhead engine. Couldnt get spark to save my life until I put the original hammerhead stator into the buggy. I thought I had purchased a dc powered cdi but whenever I hook it up, I lose spark. That being said, the scooter motor (supposedly in great condition) is smoking like a freight train. Just ordered a 155cc piston from Mike at BuggypartsNW. Hoping I wont have too hard of a time doing the work. Also having issues with brakes atm. Just tried the reverse bleed with syringe trick, it filled the reservoir but still no brakes or reverse. Just one thing after another.

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 Post subject: Re: DC or AC CDI?
PostPosted: Sat Aug 25, 2012 4:19 pm 
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do the rear brakes work? fronts?

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 Post subject: Re: DC or AC CDI?
PostPosted: Sat Aug 25, 2012 7:38 pm 
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BIGE wrote:
do the rear brakes work? fronts?



Nada. So far on the test runs, I've managed to stop with the head on assistance of my dodge and a steep ditch. Lol. Not real sure what's keeping the brakes from engaging. That being said, I'm actually heading out to buy a gk13b now with a chewed reverse gear or something. Too many buggies that aren't running.

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 Post subject: Re: DC or AC CDI?
PostPosted: Sun Aug 26, 2012 8:52 am 
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check the calipers to make sure the pistons are moving, then bleed them and replace the pads if they need it

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