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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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08-23-2010, 03:27 PM | #1 |
Not Yet Wild
Join Date: Jul 2007
Location: Newark, Delaware
Posts: 33
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Cheap G1 CDI - $20.16
Out of curiosity, I was trying to figure out what was in a G1 Cap Discharge Ignition module that was worth $200-$300. I came to the conclusion.... not much, especially for a 1-cylinder, 2-stroke like the G1. The most unique thing about the G1 engine is that it (like a few others) can run backwards. I decided to try and build my own CDI.
In doing a little more research though, I came across some very inexpensive chinese CDIs for ATVs and dirt bikes. They typically come in two flavors, a 5-pin version which gets its power from the magneto source coil and a 4-pin version which is powered by the 12v system and doesn't require a source coil input. I ordered a 5-pin CDI and a harness which I figured could be adapted to my needs. WWW.BESTGPG.COM The pinouts on the 5-pin differ from a 6-pin yamaha oem CDI in that there is only one pulser input on the 5-pin, while the 6-pin yamaha has two, one for forward and one for reverse. I saw a schematic in the yamaha shop manual which seemed to indicate that the two pulser inputs were simply tied together within the CDI through a couple of diodes, so I duplicated that outside the new CDI on the harness (see attached). Anyway, the darn thing works and performance wise I can't tell the difference between the two. Cost to Build Component/ Supplier/ Cost CDI and Harness/ bestgpg.com/ $14.99 1N4004 Diodes(2)/ Radio Shack/ 0.99 PC Board/ Radio Shack/ 1.99 - not really required Snap Connectors/ Radio Shack/ 2.19 Total Cost $20.16 kwest |
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08-23-2010, 05:23 PM | #2 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: Cheap G1 CDI - $20.16
Sticky worthy. Thanks
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08-23-2010, 06:03 PM | #3 |
Not Yet Wild
Join Date: Aug 2010
Location: Texas
Posts: 59
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Re: Cheap G1 CDI - $20.16
Excellent info, I was wondering if these cheaper versions could be adapted as well,
but my electrical knowledge isn't on the highest level. I know only the basic stuff, enough to get by most of the time. |
09-16-2010, 08:10 PM | #4 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
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Re: Cheap G1 CDI - $20.16
If you dig around some of the Chinese motorcycles are yamaha copies but think they are all 4 strokes....if that matters, not sure on the scooters but some are 2 stoke. However you can get adjustable CDI for some of them but they cost more, then you can play with the timing advance curve.
Great post BTW! |
09-17-2010, 02:20 PM | #5 |
Not Yet Wild
Join Date: Jul 2007
Location: Newark, Delaware
Posts: 33
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Re: Cheap G1 CDI - $20.16
Yeh, I thought about getting one with adjustable timing but I wasn't sure this was going to work so I went cheap. Interesting experiment though. I wonder what that would do to the 2-stroke performance?
-kwest |
09-17-2010, 02:57 PM | #6 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
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Re: Cheap G1 CDI - $20.16
It made the one I had go faster, I advanced the plate under the flywheel but then it went slower in reverse. With the CDI that would not be an issue. I can't believe that place has the CDI for $5 though, wow what a deal. I think it was over $40 at a similar place was the cheapest adjustable one I could find. It does not make a huge difference though, but I ran mine down the road and open areas on stock tires, so it really ran the rpms all the time and that is where the advance seems to help more.
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10-12-2010, 05:25 PM | #7 |
Not Yet Wild
Join Date: Oct 2010
Posts: 4
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Re: Cheap G1 CDI - $20.16
can I use this for the ig module on a G9?
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10-13-2010, 09:16 AM | #8 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
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Re: Cheap G1 CDI - $20.16
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10-26-2010, 07:49 PM | #9 | |
Not Yet Wild
Join Date: Oct 2010
Location: Manning, sc
Posts: 1
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Re: Cheap G1 CDI - $20.16
Dude flat out awesome! Im glad im apart of this great forum! I did this same replacement / upgrade. Bought a upgrade cdi from ebay for a 50cc to 250cc motor. Took a look at your pinouts and BAM. Less than20 dollars I have a better and quicker running cart! Thank you sir.
Erik Quote:
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03-26-2011, 09:21 AM | #10 |
Getting Wild
Join Date: Mar 2011
Location: New Paris,Ohio
Posts: 84
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Re: Cheap G1 CDI - $20.16
So all i need to do is order those parts you posted and assemble thats it. Ill have a new cdi unit.
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