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Old 06-04-2011, 11:03 AM   #11
Mike Mac
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Default Re: Still backfiring!

YOU WHAT? Just funnin with ya!

Tight or loose, your gonna see a performance increase!!
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Old 06-04-2011, 08:23 PM   #12
stuff4mason
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Default Re: Still backfiring!

Quote:
Originally Posted by smallblock450sl View Post
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
Awsome! Thank you for the write up! Sounds like maybe this should be a stickey?
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Old 06-09-2011, 11:42 AM   #13
stuff4mason
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Default 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!
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Old 06-09-2011, 11:49 AM   #14
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Default Re: Still backfiring!

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Originally Posted by stuff4mason View Post
Awsome! Thank you for the write up! Sounds like maybe this should be a stickey?
Done. And thanks Dave.

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Old 06-09-2011, 07:26 PM   #15
smallblock450sl
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Default 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"
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Old 06-09-2011, 10:43 PM   #16
Mike Mac
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Default 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.
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Old 06-13-2011, 08:59 AM   #17
stuff4mason
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Default 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!!
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Old 06-13-2011, 01:36 PM   #18
sho305
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Default 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.
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Old 06-13-2011, 09:34 PM   #19
smallblock450sl
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Default Re: Still backfiring!

Quote:
Originally Posted by stuff4mason View Post
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!!
Sorry to hear it didn't fix the problem. At least the valves are adjusted correctly. If I can think of anything else I'll post it. Dave
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Old 06-14-2011, 07:28 AM   #20
caddylac camper
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Default 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.
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