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12-23-2017, 12:31 AM | #1 |
Not Yet Wild
Join Date: Jun 2016
Location: Auckland New Zealand
Posts: 71
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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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12-23-2017, 08:07 AM | #2 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Yamaha G2 backfiring and not starting
The air box on these need to be completely sealed to run correctly
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12-23-2017, 04:29 PM | #3 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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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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12-23-2017, 06:52 PM | #4 |
Not Yet Wild
Join Date: Jun 2016
Location: Auckland New Zealand
Posts: 71
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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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12-25-2017, 06:25 PM | #5 |
Not Yet Wild
Join Date: Jun 2016
Location: Auckland New Zealand
Posts: 71
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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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12-25-2017, 07:51 PM | #6 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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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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12-25-2017, 08:19 PM | #7 |
Not Yet Wild
Join Date: Jun 2016
Location: Auckland New Zealand
Posts: 71
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Re: Yamaha G2 backfiring and not starting
Googling!
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12-25-2017, 09:24 PM | #8 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Yamaha G2 backfiring and not starting
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