lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Gas Yamaha
Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



Post New Thread  Reply
 
Thread Tools Display Modes
Old 06-03-2011, 10:24 AM   #1
stuff4mason
G8 Club Founding Member
 
stuff4mason's Avatar
Yamaha
 
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
Default Still backfiring!

Guys,

I know I have beat this issue to death over the last few months, but I still got backfiring issues!

OK, the main problem was, when I moved the main throttle cable directly to the carb (bypass gov), I had the end of the cable too close to the carb. I backed the end of the cable way out (away from carb) and it stopped 98% of the backfire.

But, there is a very steep hill at the campground, heading down to the lake. This seems to be the only place it does it now. As I hit the brake coming down that steep hill (Kinda long hill) (no gas pedal) when I get to the bottom, one BLAM!!!

Let me tell you, people at the beach and on the docks JUMP!! Those who know my cart expect it, but others, not so much!! Heck, it even makes me jump, and I am expecting it!!!

Muffler is sealed. No Leaks. Header pipe has new gasket. Gasket between carb and engine, new. Air box is sealed tight. What else could be causing this? And yes, the butterfly is closed with no touchy the gas pedal.
stuff4mason 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 06-03-2011, 02:09 PM   #2
G1-G9
LIFE IS TAKING FOREVER
 
G1-G9's Avatar
Yamaha
 
Join Date: Apr 2010
Location: DANSVILLE NY
Posts: 5,327
Default Re: Still backfiring!

mine did the same thing until i changed my muffler. i dont know why it didnt make any sence i use the same gasket and everything. i had changed the carb with the other two i have and i finaly changed the motor but i used the same muffler on the engine change. but until i changed the muffler it still back fired. no holes or even of any kind.
G1-G9 is offline   Reply With Quote
Old 06-03-2011, 03:47 PM   #3
the.hogman
Not Yet Wild
 
the.hogman's Avatar
Yamaha
 
Join Date: Nov 2010
Location: Central Illinois
Posts: 52
Default Re: Still backfiring!

When you are coasting (especially from a higher speed) you load the exhaust with raw gas fumes. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust.

This is very prevalent on lawnmowers that have been running hard and then shut off with no idle period between. Allowing a short idle period helps theis problem on the mowers.

Now what to do in this particular golf cart case.....

Hope this helps.
the.hogman is offline   Reply With Quote
Old 06-03-2011, 03:59 PM   #4
DOOmsman
Gone Wild
 
DOOmsman's Avatar
Yamaha
 
Join Date: Jul 2008
Location: Reddick IL
Posts: 11,217
Default Re: Still backfiring!

You can changing the air mixture screw a 1/4 turn at a time both in and out.
DOOmsman is offline   Reply With Quote
Old 06-03-2011, 09:18 PM   #5
Mike Mac
G8 Specialist
Yamaha
 
Join Date: Jun 2009
Location: Phoenix
Posts: 7,799
Default Re: Still backfiring!

Exhaust gasket is usually one time use, they get hard when hot. No good when you attempt to use a second time.

After doin some thinking, I bet you have the throttle hingin just a bit open!
Mike Mac is offline   Reply With Quote
Old 06-04-2011, 09:00 AM   #6
stuff4mason
G8 Club Founding Member
 
stuff4mason's Avatar
Yamaha
 
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
Default Re: Still backfiring!

Quote:
Originally Posted by DOOmsman View Post
You can changing the air mixture screw a 1/4 turn at a time both in and out.
You think its a mixture issue?
stuff4mason is offline   Reply With Quote
Old 06-04-2011, 09:02 AM   #7
stuff4mason
G8 Club Founding Member
 
stuff4mason's Avatar
Yamaha
 
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
Default Re: Still backfiring!

Quote:
Originally Posted by Mike Mac View Post
Exhaust gasket is usually one time use, they get hard when hot. No good when you attempt to use a second time.

After doin some thinking, I bet you have the throttle hingin just a bit open!
Possibly Mike. But probably not. As I've checked this like 4 times now.
stuff4mason is offline   Reply With Quote
Old 06-04-2011, 09:05 AM   #8
smallblock450sl
Sometime's............
 
smallblock450sl's Avatar
Yamaha
 
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,868
Default Re: Still backfiring!

Just a thought, Have you adjusted your valves? (4 thousanths on both intake and exhaust, when the engine is cold) Seems you have covered almost everything that could cover the backfireing symptom. Good luck
smallblock450sl is offline   Reply With Quote
Old 06-04-2011, 09:58 AM   #9
stuff4mason
G8 Club Founding Member
 
stuff4mason's Avatar
Yamaha
 
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
Default Re: Still backfiring!

I hate to admit this small, but I have no clue how to do that!
stuff4mason is offline   Reply With Quote
Old 06-04-2011, 10:16 AM   #10
smallblock450sl
Sometime's............
 
smallblock450sl's Avatar
Yamaha
 
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,868
Default Re: Still backfiring!

Quote:
Originally Posted by stuff4mason View Post
I hate to admit this small, but I have no clue how to do that!
No problemo....take the 4 valve cover bolts off and remove the valve cover and remove the spark plug. useing a screwdriver into the spark plug hole, turn the engine over (by hand!) by turning the primary clutch till the piston is at "top dead center" or "TDC". Use a 4 thousanths feeler gauge between the top of the valve stem and the rocker arm addjustment bolt head. If there to tight, the valve can't close, if to loose..you could lose a push rod when reving it up. To adjust, if needed, loosen the 10 mm "jam nut" on the adjuster screw, then ever so slightly, turn the adjuster screw (clockwise to tighten) till there is a "slight drag" on the feeler gauge, then tighten the jam nut and check witthe feeler gauge for tightness. You will need to do this several times, because the "tightening of the jam nut will affect the adjustment. Then, it is VERY important that you turn the engine over (back to TDC) and recheck the settings. I myself usually turn the engine over and check about 5 times to make shure the adjustment is correct. Reinstall the spark plug and the valve cover and give it a run. Good luck
smallblock450sl is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Gas Yamaha


Thread Tools
Display Modes


Similar Threads
Thread Forum
FE 350 Still backfiring Gas Club Car
G1 Backfiring Gas Yamaha
G16 Backfiring! Gas Yamaha
backfiring G9 Gas Yamaha
backfiring Gas EZGO


All times are GMT -5. The time now is 05:26 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.