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Old 12-23-2017, 12:31 AM   #1
nzdrew
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Yamaha
 
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Location: Auckland New Zealand
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Default Yamaha G2 backfiring and not starting

Hi there. I have a yamaha g2 was running fine, but smelled a bit rich. Suddenly, won't start (although the engine sounds like it catches every now and again) and it's backfiring through the air cleaner and puffing black smoke. Any ideas?
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Old 12-23-2017, 08:07 AM   #2
Spicyunicorn
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Default Re: Yamaha G2 backfiring and not starting

The air box on these need to be completely sealed to run correctly
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Old 12-23-2017, 04:29 PM   #3
cgtech
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Location: AZ
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Default Re: Yamaha G2 backfiring and not starting

Puffing black smoke is Way too much fuel issue. Likely a bad needle on the carb float. Check your oil level to see if it is now mysteriously over full, and smelling like fuel.
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Old 12-23-2017, 06:52 PM   #4
nzdrew
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Default Re: Yamaha G2 backfiring and not starting

Ok. So pulled carb out and cleaned. Checked air box for obstructions and re-sealed. Checked spark plug for spark. Check fuel pump is supplying fuel. Plenty of battery. Won’t even try and start. At least it’s not backfiring...
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Old 12-25-2017, 06:25 PM   #5
nzdrew
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Default Re: Yamaha G2 backfiring and not starting

I have it running OK at half throttle. As soon as I floor it it bogs and dies. Is this progress?
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Old 12-25-2017, 07:51 PM   #6
Spicyunicorn
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Default Re: Yamaha G2 backfiring and not starting

Have you ever set valve lash? If not I'd do that and go from there .004"
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Old 12-25-2017, 08:19 PM   #7
nzdrew
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Default Re: Yamaha G2 backfiring and not starting

Googling!
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Old 12-25-2017, 09:24 PM   #8
Spicyunicorn
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Default Re: Yamaha G2 backfiring and not starting

http://www.buggiesgonewild.com/gas-y...djustment.html
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