Yamaha G16 lost spark

mattrourke · 06-07-2019, 08:36 PM

Hey guys,

So since I've rebuilt and built up my cart I have never taken it for more than a 15 minute ride. Today I loaned it to a couple guys for a round of golf. They made it about 10-12 holes with no issues other than running a bit rich which i thought may happen with cheap aftermarket carb (still can't manage to get the stock carb working). Then it started to run for a few seconds and quit and sometimes wouldn't start at all. So we pushed it on the trailer and I got it back to my shop. Ran great around the block a couple times and got it in the shop and then it didn't want to start. I pulled the plug and cleaned it up (it wasnt bad as it was brand new a month ago). When i held it against a bolt on the block I would only occasionally get a spark and didn't seem to be a very hot one. I put the plug back in and again it would only start occasionally and only run for a few seconds and then die.

I was reading around and see some info on g9s with ignition coil issues and other electric problems on various models. What should i be checking/replacing first?

Thanks for the help!

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Dave in VA · 06-07-2019, 09:02 PM

It sounds like the coil/TCI unit is bad. Yamaha OEM part is the way to go. Aftermarket is junk. Search for the best price. It's usually partzilla...

JN6-85640-00-00 T.C.I. UNIT ASSY

mattrourke · 06-08-2019, 10:18 AM

Thank you.

Ordered one up, as well as new spark plug boot and a new voltage regulator because mine looks very corroded and rough. We will see how it goes.

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mattrourke · 06-09-2019, 03:31 PM

I went to start it today and it ran perfectly so I'm even more confident that it is caused by something that gets hot after running for s few hours.

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Dave in VA · 06-09-2019, 06:03 PM

Quote:

Originally Posted by mattrourke

I went to start it today and it ran perfectly so I'm even more confident that it is caused by something that gets hot after running for s few hours.

Sent from my Pixel 3 XL using Tapatalk

Get an inline spark tester. It'll let you know if/when you lose spark.

sformal · 06-10-2019, 02:38 AM

Quote:

Originally Posted by mattrourke

I went to start it today and it ran perfectly so I'm even more confident that it is caused by something that gets hot after running for s few hours.

Sent from my Pixel 3 XL using Tapatalk

It is exactly a symptom of a bad TCI! Did you install your new one?

mattrourke · 06-10-2019, 09:58 AM

Not yet. Ordered the parts on Friday. Likely won't see them until the end of this week. I will update the thread once I've installed.

Thanks!

Sent from my Pixel 3 XL using Tapatalk

06-07-2019, 08:36 PM	#1
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116	Yamaha G16 lost spark Hey guys, So since I've rebuilt and built up my cart I have never taken it for more than a 15 minute ride. Today I loaned it to a couple guys for a round of golf. They made it about 10-12 holes with no issues other than running a bit rich which i thought may happen with cheap aftermarket carb (still can't manage to get the stock carb working). Then it started to run for a few seconds and quit and sometimes wouldn't start at all. So we pushed it on the trailer and I got it back to my shop. Ran great around the block a couple times and got it in the shop and then it didn't want to start. I pulled the plug and cleaned it up (it wasnt bad as it was brand new a month ago). When i held it against a bolt on the block I would only occasionally get a spark and didn't seem to be a very hot one. I put the plug back in and again it would only start occasionally and only run for a few seconds and then die. I was reading around and see some info on g9s with ignition coil issues and other electric problems on various models. What should i be checking/replacing first? Thanks for the help! Sent from my Pixel 3 XL using Tapatalk
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116

06-07-2019, 09:02 PM	#2
Dave in VA maintaining a low profile Join Date: Oct 2009 Location: SW Virginia USA Posts: 6,314	Re: Yamaha G16 lost spark It sounds like the coil/TCI unit is bad. Yamaha OEM part is the way to go. Aftermarket is junk. Search for the best price. It's usually partzilla... JN6-85640-00-00 T.C.I. UNIT ASSY

06-08-2019, 10:18 AM	#3
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116	Re: Yamaha G16 lost spark Thank you. Ordered one up, as well as new spark plug boot and a new voltage regulator because mine looks very corroded and rough. We will see how it goes. Sent from my Pixel 3 XL using Tapatalk
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116

06-09-2019, 03:31 PM	#4
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116	Re: Yamaha G16 lost spark I went to start it today and it ran perfectly so I'm even more confident that it is caused by something that gets hot after running for s few hours. Sent from my Pixel 3 XL using Tapatalk
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116

06-10-2019, 09:58 AM	#7
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116	Re: Yamaha G16 lost spark Not yet. Ordered the parts on Friday. Likely won't see them until the end of this week. I will update the thread once I've installed. Thanks! Sent from my Pixel 3 XL using Tapatalk
mattrourke Getting Wild Join Date: Jul 2013 Posts: 116

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