|
Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
|
Thread Tools | Display Modes |
06-04-2011, 11:03 AM | #11 |
G8 Specialist
Join Date: Jun 2009
Location: Phoenix
Posts: 7,799
|
Re: Still backfiring!
YOU WHAT? Just funnin with ya!
Tight or loose, your gonna see a performance increase!! |
Today | |
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 |
|
06-04-2011, 08:23 PM | #12 | |
G8 Club Founding Member
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
|
Re: Still backfiring!
Quote:
|
|
06-09-2011, 11:42 AM | #13 |
G8 Club Founding Member
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
|
Re: Still backfiring!
Smallblock, I think you hit the nail on the head! I (with some help) adjusted the valves like you said, and they were way off. The gasket around the head was also in bad shape. But, after adjusting and new gasket sealer, she's not backfiring! I won't know for sure until I take it back to the lake to that nasty hill again, but on the hills around here, it didn't do it!! YES man! Thank you!
|
06-09-2011, 11:49 AM | #14 |
Admin
Join Date: Dec 2006
Location: TN
Posts: 101,827
|
Re: Still backfiring!
|
|
|
06-09-2011, 07:26 PM | #15 |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,868
|
Re: Still backfiring!
After all the great suggestions for a fix, I was rolling it around in my head...what could be happening to cause this. I alway's enjoy the posts that said "I think it fixed my problem". That is why myself and so many other BGW members post, I will keep my fingers crossed it did. If I only knew as much about Ezgo and Club Car electrics as Scottyb/Gorno/Roady ect, I'd try to help there too. I think I'll stick with Yamaha's. Let us know what happens on "the hill"
|
06-09-2011, 10:43 PM | #16 |
G8 Specialist
Join Date: Jun 2009
Location: Phoenix
Posts: 7,799
|
Re: Still backfiring!
Block, you blow me away with all your theory. I believe all brands are pretty much the same as far as trouble shooting. Its just part # that would be different. I bet you know more than you think you do.
|
06-13-2011, 08:59 AM | #17 |
G8 Club Founding Member
Join Date: Sep 2010
Location: Middle of Virginia, USA
Posts: 4,265
|
Re: Still backfiring!
So, still poping on that hill at the lake, but instead of a BANG, now it does pluuaa. I am wondering if the reason the hill does it there and no where else, is the hill is asphalt. As soon as you get to the bottom, it turns to gravel. Well who knows. But anyway, it is MUCH better. I won't be giving old ladies heart attacks on the beach any longer!!
|
06-13-2011, 01:36 PM | #18 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
|
Re: Still backfiring!
It is usually too lean a mixture at idle, there is not enough gas to burn at idle so it collects in the muffler. What also happens on carts is they are set to have no idle and when a carb closes the butterfly all the way airflow stops so you have no mixture either. The best way is to set it to a slow idle, then set the idle mix a little rich. On a cart this idle should be just a hair faster than the starter, which is very slow sometimes its hard to get them to run that slow consistently. Anyway, you also have to make sure the throttle cable is not tight, so you can touch the pedal just enough it starts and idles like that, then more pedal makes the carb open and off you go. I've never had a cart backfire after setting it like this, just like a lawnmower, though those can backfire if the muffler is really hot when you shut one down fast from hard running. Another cause is a leak between the muffler and the head letting air into the exhaust, can't have that, but often you can hear it or see black soot leaking out.
Note most lawn engines they recommend ~1,000 rpm idle so they cool and maybe keep a hydrostat spinning fast enough. I have had people tell me on certain carts it worked better to have the idle speed set to nothing, the carb closes all the way, but I have not seen that yet myself. Usually starting is faster with proper idle as well. Of course the real problem is new carbs with no idle mix you can't change this, and they love to set the idle really lean. Note about the first 4 seconds of my video how it idles, how it starts on the first revolution. It will not make the cart move when it idles. |
06-13-2011, 09:34 PM | #19 | |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,868
|
Re: Still backfiring!
Quote:
|
|
06-14-2011, 07:28 AM | #20 |
Gone Wild
Join Date: Feb 2011
Location: Winnipeg, Manitoba
Posts: 177
|
Re: Still backfiring!
This thread has been interesting and it seems like most tuning problems have been addressed. My thoughts are that on the long coast downhill with the foot off the gas pedal should the engine not be stationary? If it has come to a stop then it cannot pump unburned fuel into the exhaust system. The secondary clutch should close and the primary clutch open allowing them to freewheel with the engine stopped. Once the gas pedal is depressed engine should start at its normal idle speed. Please correct me if i am wrong, I'm new to carts as well.
|
|
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 |