Yamaha G9 won't fire

Moose0013 · 05-18-2018, 08:06 PM

My '94 yamaha G9 abruptly quit running on us this weekend and we couldn't get it restarted so we towed it back home. The next day, before tinkering with it, I mashed on the gas and to my surprise, it fired right up. So I drove it around the block and as soon as I let off the throttle to make a turn, it cut off again. I couldn't get it to start back up. So again, I towed it home. Since then, I've tried everything I can think of to get it running right and nothing is working. The motor turns over and the drive clutch and belts move but it just doesn't want to fire. I step on the gas and just get a chug, chug, chug, chug, chug.
This is what I've tried so far:
✔ checked air box, cleaned air filter, and checked air hoses for cracks. Good.
✔ checked fuel pump and in line filter by removing hose from carburater and stepping on throttle. Good.
✔ removed carburater and disassembled. Throughly cleaned bowl and all jets. Checked all hoses entering and leaving carb. Good
✔ attempted to get a reaction by spraying staring fluid in throat... no difference.
✔ checked for spark by removing spark plug and holding plug to valve cover while stepping on gas. Had spark but replaced with a new plug anyway.
✔ Checked compression at spark plug with compression gauge. Consistently reads 140 psi.

What else can I check? The only time I can get it to fire is after its been sitting for a long period of time and it won't restart after letting it idle off.
I've drained the battery over the past 3 days trying to get it to run and I can't think of anything that it's missing for combustion.
I have fuel, spark, compression and air flow! What gives???

nitro1 · 05-18-2018, 08:17 PM

Sounds like your igniter

Moose0013 · 05-18-2018, 08:21 PM

If the igniter was bad, I wouldn't be getting spark on the plug though, right?

nitro1 · 05-18-2018, 08:53 PM

Once the igniter gets hot I think it will loose spark, once it cools down it will work for a short time till it gets hot again, that’s what I’ve read through out the forums

Spicyunicorn · 05-18-2018, 09:29 PM

Pull connection out of the ignitor and check for corrosion on chased a spark issue and this was the problem.... Did you have continuous spark or just one spark? I've been ignitors go bad and will spark once when you step on the throttle then stop let of the throttle step on it again and one spark then nothing

Moose0013 · 05-18-2018, 10:05 PM

Quote:

Originally Posted by Spicyunicorn

Pull connection out of the ignitor and check for corrosion on chased a spark issue and this was the problem.... Did you have continuous spark or just one spark? I've been ignitors go bad and will spark once when you step on the throttle then stop let of the throttle step on it again and one spark then nothing

Spark is continuous

sformal · 05-19-2018, 05:06 AM

Gas quality? Perhaps water/condensation in it...

CP241 · 05-19-2018, 07:48 AM

See my thread G9 bogs and stalls... stumped.

Sounds very similar to what I was chasing. I could pull the plug and have spark. It would run GREAT for a couple minutes when I first got in it then it would die and nothing. Ignitor got wicked hot near where the connector is located. Just because you have spark doesn't necessarily mean it's strong enough to do anything either.

Or what I did was set TDC and mark the top of the primary clutch with a neon green paint pen. Grab a timing light and ride it around the yard until it dies. Once it dies, put it in "neutral" (shifter straight up) and keep the has pedal depressed so it keeps chugging. Shoot at your paint mark with a timing light. I'll bet you've got nothing.

I tried 3 brand new ignitors in it with the same results. They were all the aftermarket one, it appears that no matter WHO you buy it from amazon, eBay, golfcartsunlimited, etc) it's all the EXACT same one. They even use the same picture. It's junk. Either buy an OEM Yamaha for $300 or I did the Chrysler ignition module trick and it runs awesome. Hasn't had a single issue since I put it in.

nitro1 · 05-19-2018, 08:37 AM

What’s the Chrysler ignition module trick

Moose0013 · 05-19-2018, 08:49 AM

Quote:

Originally Posted by sformal

Gas quality? Perhaps water/condensation in it...

I forgot top mention that I drained fuel tank and filled up with fresh non-ethanol rec fuel.

05-18-2018, 08:06 PM	#1
Moose0013 Not Yet Wild Join Date: May 2018 Posts: 8	Yamaha G9 won't fire My '94 yamaha G9 abruptly quit running on us this weekend and we couldn't get it restarted so we towed it back home. The next day, before tinkering with it, I mashed on the gas and to my surprise, it fired right up. So I drove it around the block and as soon as I let off the throttle to make a turn, it cut off again. I couldn't get it to start back up. So again, I towed it home. Since then, I've tried everything I can think of to get it running right and nothing is working. The motor turns over and the drive clutch and belts move but it just doesn't want to fire. I step on the gas and just get a chug, chug, chug, chug, chug. This is what I've tried so far: ✔ checked air box, cleaned air filter, and checked air hoses for cracks. Good. ✔ checked fuel pump and in line filter by removing hose from carburater and stepping on throttle. Good. ✔ removed carburater and disassembled. Throughly cleaned bowl and all jets. Checked all hoses entering and leaving carb. Good ✔ attempted to get a reaction by spraying staring fluid in throat... no difference. ✔ checked for spark by removing spark plug and holding plug to valve cover while stepping on gas. Had spark but replaced with a new plug anyway. ✔ Checked compression at spark plug with compression gauge. Consistently reads 140 psi. What else can I check? The only time I can get it to fire is after its been sitting for a long period of time and it won't restart after letting it idle off. I've drained the battery over the past 3 days trying to get it to run and I can't think of anything that it's missing for combustion. I have fuel, spark, compression and air flow! What gives???
Moose0013 Not Yet Wild Join Date: May 2018 Posts: 8

05-18-2018, 08:17 PM	#2
nitro1 Gone Wild Join Date: May 2010 Location: OHIO Posts: 1,517	Re: Yamaha G9 won't fire Sounds like your igniter

05-18-2018, 08:21 PM	#3
Moose0013 Not Yet Wild Join Date: May 2018 Posts: 8	Re: Yamaha G9 won't fire If the igniter was bad, I wouldn't be getting spark on the plug though, right?
Moose0013 Not Yet Wild Join Date: May 2018 Posts: 8

05-18-2018, 08:53 PM	#4
nitro1 Gone Wild Join Date: May 2010 Location: OHIO Posts: 1,517	Re: Yamaha G9 won't fire Once the igniter gets hot I think it will loose spark, once it cools down it will work for a short time till it gets hot again, that’s what I’ve read through out the forums

05-18-2018, 09:29 PM	#5
Spicyunicorn Gone Wild Join Date: Jun 2015 Location: NW Iowa Posts: 1,669	Re: Yamaha G9 won't fire Pull connection out of the ignitor and check for corrosion on chased a spark issue and this was the problem.... Did you have continuous spark or just one spark? I've been ignitors go bad and will spark once when you step on the throttle then stop let of the throttle step on it again and one spark then nothing

Today
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05-19-2018, 05:06 AM	#7
sformal Gone Wild Join Date: Jun 2015 Location: Philippines Posts: 570	Re: Yamaha G9 won't fire Gas quality? Perhaps water/condensation in it...

05-19-2018, 07:48 AM	#8
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,666	Re: Yamaha G9 won't fire See my thread G9 bogs and stalls... stumped. Sounds very similar to what I was chasing. I could pull the plug and have spark. It would run GREAT for a couple minutes when I first got in it then it would die and nothing. Ignitor got wicked hot near where the connector is located. Just because you have spark doesn't necessarily mean it's strong enough to do anything either. Or what I did was set TDC and mark the top of the primary clutch with a neon green paint pen. Grab a timing light and ride it around the yard until it dies. Once it dies, put it in "neutral" (shifter straight up) and keep the has pedal depressed so it keeps chugging. Shoot at your paint mark with a timing light. I'll bet you've got nothing. I tried 3 brand new ignitors in it with the same results. They were all the aftermarket one, it appears that no matter WHO you buy it from amazon, eBay, golfcartsunlimited, etc) it's all the EXACT same one. They even use the same picture. It's junk. Either buy an OEM Yamaha for $300 or I did the Chrysler ignition module trick and it runs awesome. Hasn't had a single issue since I put it in.

05-19-2018, 08:37 AM	#9
nitro1 Gone Wild Join Date: May 2010 Location: OHIO Posts: 1,517	Re: Yamaha G9 won't fire What’s the Chrysler ignition module trick

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