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06-30-2015, 06:16 PM
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#1 |
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Getting Wild
Join Date: Apr 2014
Location: Florida
Posts: 129
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G21 build. ....almost done ....backfire???
Ok, so if you have seen my other post I am rebuilding a 2002 g21a. Here is a photo almost complete. Had to take it for a ride today as way to much wrench time and no ride time. So I ran to my buddies house about 2 miles away and was running full throttle most of the way few stop signs here and there cart seems to run fine I have adjusted governor and throttle cables as I have seen here and in service manuals. I am getting about 20mph so in happy with that but when I let off he has rounding a corner I got a backfire. Then no issues. I the way back I let off the gas to come to a stop and another backfire then no issues. Any thoughts ????
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06-30-2015, 06:17 PM
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#2 |
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Getting Wild
Join Date: Apr 2014
Location: Florida
Posts: 129
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Re: G21 build. ....almost done ....backfire???
**** I phone flipping pictures. By the way the issue is not cause I'm driving upside down!!!
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06-30-2015, 06:46 PM
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#3 |
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Gone Wild
Join Date: Oct 2012
Posts: 1,733
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Re: G21 build. ....almost done ....backfire???
My iPhone6 is the same way with flipping pictures on this forum. If I don't take the pictures with the phone up and down position it will flip them. If I take a picture with the phone sideways (landscape) I have to edit the picture in the library by spinning it then save then spin it back to the original position and save it again. This is the only forum it does this. Hmm
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06-30-2015, 06:48 PM
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#4 |
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Gone Wild
Join Date: Oct 2012
Posts: 1,733
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Re: G21 build. ....almost done ....backfire???
Btw the backfire from what I have read on these forums is caused from the butterfly in the carb not completely closing when letting off the throttle. The cure is to get a spring that puts tension on the butterfly so that when you let off the pedal the spring will pull the butterfly in the carb closed each time.
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06-30-2015, 06:55 PM
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#5 |
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Gone Wild
Join Date: Oct 2012
Posts: 1,733
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Re: G21 build. ....almost done ....backfire???
See if this will half way help you out
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06-30-2015, 07:00 PM
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#6 |
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Sometime's............
 Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,874
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Re: G21 build. ....almost done ....backfire???
Thanks DB...Man I was afraid the little one was going to land on his head
 If the throttle shaft (cable adjustments and throttle stop screw adjaustments are correct), could be an exhaust gasket or head gasket leak. |
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06-30-2015, 07:06 PM
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#7 |
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Gone Wild
Join Date: Oct 2012
Posts: 1,733
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Re: G21 build. ....almost done ....backfire???
That's another possibility like small block mentioned. Sounds like you have a few more hours of wrenching ahead of you. Also seems like I remember some members saying that the plastic spacer between the engine and carb can crack and cause problems.
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06-30-2015, 07:33 PM
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#8 |
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Getting Wild
Join Date: Apr 2014
Location: Florida
Posts: 129
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Re: G21 build. ....almost done ....backfire???
Thanks guys I will check. I'm thinking spring as it's not consistent i put new gaskets on rebuild and the plastic spacer looks ok. I know he return spring didn't look great when input it back together so I will start there.
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