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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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08-22-2010, 11:29 PM | #1 |
Not Yet Wild
Join Date: Aug 2010
Location: Texas
Posts: 59
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G1 No Spark
Ok, I managed to get it running yesterday enough to take a few laps
around the block. It ran great the first one or two laps. It got hot enough make my legs warm on the seat. I assume I will have to pull the cowling and clean out all of the mud from the dirt dobbers. After letting it set for a couple of hours with a strong fan blowing over the engine, I took the wife for a ride. It ran great again for about 100 feet, then started missing. Not excessively, but randomy. Varying the throttle made some difference, but not much. I naturally assumed a broken, shorted wire and started checking every one of them with an ohm meter to insure continuity. I only found 1 wire with major chaffing and repaired it, but still no spark. After reading every post on this site under "G1 no spark", I took the 4 wires from under the engine to the magneto and ohmed them out. Black has continuity to engine block. Black to brown has an open. White/green to white/red has 15 ohms. I figure the magneto got too hot and fell apart. Am I on the right course here? |
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08-23-2010, 05:19 AM | #2 |
Not Yet Wild
Join Date: Jul 2007
Location: Newark, Delaware
Posts: 33
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Re: G1 No Spark
Black to Brown is the magneto charging/source coil and should read about 350 ohns. If you have a digital ohm meter, make sure its set on a scale larger the 350 otherwise it will read open.
While your measuring, jiggle the harness and move the crankshaft back and forth by turning the primary sheave. I had a broken black wire that only showed up when the engine was cranked in reverse. -kwest |
08-23-2010, 05:37 AM | #3 |
Gone Wild
Join Date: Jun 2009
Location: Heluvabump,VT
Posts: 623
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Re: G1 No Spark
The black wire is ground. Brown to black is your charge coil and should be about 370 ohms. Your charge coil or the wires to it have failed.
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08-23-2010, 02:51 PM | #4 |
Not Yet Wild
Join Date: Aug 2010
Location: Texas
Posts: 59
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Re: G1 No Spark
I've puilled the magneto assembly and ohmed the larger of the two coils.
It shows 1 when I set the meter to 2K and I place the leads on the brown wire and the frame of the coil. I even pierced the brown wire as close to the coil as possible and the othe lead at the connector end, no ohms. I guess this is why I have ne spark. The other small coil ohms out to 15 ohms so it is good. Which of these two coils control spark? |
08-23-2010, 03:20 PM | #5 |
Not Yet Wild
Join Date: Jul 2007
Location: Newark, Delaware
Posts: 33
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Re: G1 No Spark
The small coil is the pulser coil which sends a signal to the Capacitor Discharge Ignition (CDI) module telling it when to fire a spark.
The big coil is the source/charging coil which provides the power to the CDI and eventually to the spark coil itself. Sounds like you might have a bad source/charging coil, dude. -kwest |
08-23-2010, 09:29 PM | #6 |
Not Yet Wild
Join Date: Aug 2010
Location: Texas
Posts: 59
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Re: G1 No Spark
So I tried to fix this coil by myself today in order to save some time and money. New coils are retail for $98.
I ripped apart an old DC power supply and removed the transformer. The wire was .005 and about 400 ft long. I opened up the source coil and found all of the enamel had been melted off the wire. In the course of counting the number of turns as I unwound it, I ran into several breaks in the wire. I got pissed and just cut the wire off without counting anymore. So I started winding the coil and about 2 hours later, I was done. Everything checked out except the resistance. I got 35 ohms. I don't have anymore wire so I'm not looking to redo this. Found a coil here for $66 https://www.georgiawatersports.com/p...wCart.asp?cs=1 Thanks for your help guys. Hopefully the cart will be up and running again soon. |
09-01-2010, 08:04 PM | #7 |
Not Yet Wild
Join Date: Aug 2010
Location: Texas
Posts: 59
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Re: G1 No Spark
After waiting a few days for my coil to arrive, I finally put everything back together.
Just FYI, the brand new OEM coil measured 370 ohms out of the package. In order to facilitate easy reinstallment, I marked the magneto backing plate and bellhousing so I could get the timing back. It fired right up but would not idle with the cdi bk/w wire disconnected. I ended up pulling the carb to find a load of trash in the bowl. This was a brand new carb put on just a couple of weeks ago along with a new filter and hoses. Turns out, the hard line running around the back of the engine had trash in it. So I moved the filter over to just before the pump ofter cleaning out the pump again. She idles so quietly and at such a low rpm. I hope everything keeps working for awhile so I can get it lifted and some new shoes on it. |
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