lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Big Block Talk! > Clone Engine Swaps


Post New Thread  Reply
 
Thread Tools Display Modes
Old 08-11-2015, 08:49 AM   #1
austinpankratz
Not Yet Wild
Yamaha
 
Join Date: Sep 2011
Location: Butterfield, MN
Posts: 43
Default Backfire/Afterfire

What causes backfire on fast deceleration and afterfire when the motor shuts off? Is it running to lean or to rich? Its a Predator 420 and i currently have the stock main jet in that it comes with from Harbor Freight, aftermarket air filter, and pretty free flowing exhaust (14" tractor muffler). Its kinda annoying. Thanks
austinpankratz is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Old 08-11-2015, 10:27 AM   #2
aladd6
Getting Wild
Club Car
 
Join Date: Sep 2013
Location: Texas
Posts: 106
Default Re: Backfire/Afterfire

Running lean, Had same issue on a VC 420, Was surprised how far I needed to crank open the mixture screw.
aladd6 is offline   Reply With Quote
Old 08-11-2015, 11:17 AM   #3
Field6565
Gone Wild
 
Field6565's Avatar
 
Join Date: Oct 2010
Location: Pittsburgh Pa
Posts: 1,551
Default Re: Backfire/Afterfire

Running lean. They are lean from the factory. Then you open up the air filter and exhaust and that makes it even more lean.
Field6565 is offline   Reply With Quote
Old 08-11-2015, 11:18 AM   #4
austinpankratz
Not Yet Wild
Yamaha
 
Join Date: Sep 2011
Location: Butterfield, MN
Posts: 43
Default Re: Backfire/Afterfire

Ahhhh.... Gotcha. Thanks
austinpankratz is offline   Reply With Quote
Old 08-11-2015, 06:25 PM   #5
sho305
Vegas modded 420
 
sho305's Avatar
Yamaha
 
Join Date: Jun 2009
Location: West MI
Posts: 15,433
Default Re: Backfire/Afterfire

You need to get the idle mix screw working, sometimes you have to enlarge the idle jet. The main is mostly at 1/4 throttle and more. If it goes flat after half throttle or runs better WOT with the choke on a little, or the plug is white, you need a larger main or enlarge it.

Lean idle causes hard starting, wont start warm with no choke, wont idle slow, pops/backfires when you let off the gas as speed.
sho305 is offline   Reply With Quote
Old 08-20-2015, 09:41 PM   #6
austinpankratz
Not Yet Wild
Yamaha
 
Join Date: Sep 2011
Location: Butterfield, MN
Posts: 43
Default Re: Backfire/Afterfire

Is there an idle mix screw on a factory carb?
austinpankratz is offline   Reply With Quote
Old 08-23-2015, 06:05 PM   #7
sho305
Vegas modded 420
 
sho305's Avatar
Yamaha
 
Join Date: Jun 2009
Location: West MI
Posts: 15,433
Default Re: Backfire/Afterfire

Yes but they plug it to cover it, or break it off. Its on the side near the spacer. If you had the head of the engine towards you, you would see it.

Brass screw on the left: http://www.ezbore.net/v/vspfiles/photos/REA035041-2.jpg

The plug is easy to drill out, if broken off you will see a stub of brass there you have to remove.
sho305 is offline   Reply With Quote
Old 08-23-2015, 06:12 PM   #8
austinpankratz
Not Yet Wild
Yamaha
 
Join Date: Sep 2011
Location: Butterfield, MN
Posts: 43
Default Re: Backfire/Afterfire

I found it... they broke the head off of it. Where can I get a screw with a head on it? And is there an easy way to get this broken off one out?
austinpankratz is offline   Reply With Quote
Old 08-28-2015, 06:33 PM   #9
sho305
Vegas modded 420
 
sho305's Avatar
Yamaha
 
Join Date: Jun 2009
Location: West MI
Posts: 15,433
Default Re: Backfire/Afterfire

I took a dremel with a tiny blade on it and cut a slot into the end of it. Then I took a solder gun and got it hot, that released the loctite and it screwed out easily. Then got on ebay and ordered a carb kit with a screw it was cheap. You may be able to get just the screw now I don't know. You need the screw and spring. This one had gobs of loctite on it, I could have screwed it out and left it.
sho305 is offline   Reply With Quote
Old 09-01-2015, 06:05 AM   #10
Robert Yow
Getting Wild
E-Z-GO
 
Join Date: Sep 2010
Location: Sanford, North Carolina
Posts: 88
Default Re: Backfire/Afterfire

I have the VC carb on mine. I had to put a 115 jet in it to get the spark plug color right. I adjusted the idle mixture screw until the idle smoothed out, but mine still back fires when I let off the gas going down a hill and sometimes when I shut it off! Should I open up the idle jet a little?
Robert Yow is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Big Block Talk! > Clone Engine Swaps


Thread Tools
Display Modes


Similar Threads
Thread Forum
Backfire??? Gas EZGO
backfire Gas Yamaha
Backfire? Gas EZGO
Backfire Gas Club Car
'89 G2 backfire Gas Yamaha


All times are GMT -5. The time now is 02:51 PM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
This Website and forum is the property of Buggiesgonewild.com. No material may be taken or duplicated in part or full without prior written consent of the owners of buggiesgonewild.com. © 2006-2017 Buggiesgonewild.com. All rights reserved.