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Old 12-06-2016, 08:17 PM   #1
brokendown
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Default Yamaha G9a ignitor fix

Ran into the issue recently where I found that my cart had lost spark. Naturally I turned to the web which led me here to find several threads on how I'm not the only one, but nothing super helpful. Tracked down the service manual and followed the steps on lost spark. [see attached pictures for reference on the procedure as I don't intend to type a whole heck of a lot]
Long story short I did all the proper testing with a meter and checked wiring connections and the condition of the harness etc. It all led me to the final step: REPLACE IGNITOR. When I saw that it was a whopping $159.99 I wasn't quite ready yet to take the chance with my money. I pried the old unit open at the front and carefully slid the circuit board out to inspect. Everything looked to be ok as far as anything obvious goes, no broken connections or sign of burning. So I brought it to a good friend of mine who I give a lot of credit to. He gave it a quick glance and pointed to the transistor. [picture attached] Model D1071. He pointed out how on the board it is mounted to a heat sync and it gets very hot is likely to be your first point of failure. So I turned to eBay and found a few replacements that ship from China. I really didn't want to wait a month so I found a cross reference chart for the transistor and went with model BU910. I got a 3 pack for $8 and received the parts rather fast. Carefully soldered the old one off and the new one on and felt very doubtful that it would work, but I figured what the heck. Needless to say that did the trick and now I'm back up and running again for $8. I hope this helps someone. I wish I took more photos at the time but I wasn't really thinking it was gonna work at first. I did however attach a picture of my crude yet effective solder job on the back of the board.
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Old 12-10-2016, 04:35 PM   #2
sho305
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Default Re: Yamaha G9a ignitor fix

Wow thanks for the post, and yes you are right anything that gets hot is often the one to die first. I have two that still work so I never messed with them, might have a use for them so keeping them.
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Old 10-13-2017, 12:52 AM   #3
beer_bandit
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Default Re: Yamaha G9a ignitor fix

Thank You for this
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Old 10-13-2017, 07:05 AM   #4
cfherrman
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Default Re: Yamaha G9a ignitor fix

I just tried this with a same brand and number transistor and it didn't work, I believe the new transistor was different then the old. I didn't have desolder braid so I ruined the old transistor and couldn't reuse it. I would try the other number transistor in the post.
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Old 10-13-2017, 09:03 AM   #5
roncoinc
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Default Re: Yamaha G9a ignitor fix

2SD1071 is what to look for.
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Old 10-13-2017, 05:00 PM   #6
cfherrman
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Default Re: Yamaha G9a ignitor fix

I'll look
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