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bwssr 08-10-2005 09:46 AM

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It backfires thru the exhaust

twisty 08-10-2005 10:01 AM

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bwssr wrote:

It backfires thru the exhaust
bwssr, those old Wings use a lost spark type ignition so fire the spark plugs on both compression & exhaust.. Any fuel remaining in the exhaust system or cylinder will fire off on the first spark if air is present. You might try starting it without opening the throttle as that should lessen the air present during starting.

You could also have a slightly leaking carb & allowing fuel to drip into one cylinder.. It can also pull fuel/air into a cylinder & exhaust system from a carb on any cylinder that stops with both the intake & exhaust valve open, the hot exhaust can use convection to keep drawing through the cylinder & carb.

Things to try--

Try turning the kill switch off, then start cranking the engine, once it is cranking flip the kill switch on.

Try different choke settings to see if a different setting will kill that pop.

Try starting with less or more throttle opening.

Try either using or not using the center stand when parked hot.

Verify all exhaust joints are sealed & there are no holes in the exhaust system anywhere.

Try a different type/grade of gasoline as maybe you are getting a hot soak boiling of the fuel in the carbs.


Goldwinger1984 08-10-2005 10:31 AM

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bwssr, does your wing backfire when decelerating from highway speeds?

Also was the backfiring there before you changed the timing belts?

It's not easy to diagnose a problem like this online but if you work with us there is enough knowledge and experience here to get your problem solved if you can bear with us.


mag 08-10-2005 11:44 AM

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You should not be on the throttle at all when starting. Hit the starter, when the bike starts to 'catch,' then open the throttle (instructions from my mechanic). You might be flooding it a little on startup, leading to unburnt fuel=backfire. Any old gas/moisture in the tank could be the culprit too. If the bike backfires on decceleration, it's probably the air-cut valve(s) on the carb(s).

bwssr 08-10-2005 05:53 PM

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I only get the backfire from the cycle when I start while the engine is warm or hot and I give it gas to get it to start. I also noticed that after I get done riding there is a gas smell. Also there is a rapping noise from the area under passenger pegsusually when I am going uphills and when it's hot. Now I am noticing that my starrter stalls when I go to start the bike hot or cold.

wingdawg101 08-10-2005 07:23 PM

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Send a PM to "Jason" he's pretty keen on troubleshooting?!:clapper:

bwssr 08-10-2005 09:25 PM

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Now I could not start the bike at all with the starter. It was like it didn't have enough umph so I push started it on a flat parking lot. Fun aye!

Goldwinger1984 08-11-2005 10:50 AM

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I'm beginning to wonder if your charging system is dying causing a weak spark and slow or no starting. Check the alternator output to be sure.

Have the battery checked by a professional, if good remove the starter and inspect the brushes, ground and lubrication.


bwssr 08-11-2005 11:41 AM

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OK maybe I jumped the gun. I took the battery out added acid to it and cleaned all the connections. PUt it back in and tightened all the conntections hit the startet and it started no problem. Also I put in a ec wiring harness a while back. The former owner had replaced the stator and it starting to melt the plug which prompted me to get the harness.

For the backfire I think I amy need to sync the carbs and I may also have an exhaust leak on the left side which is where it seems that the noise comes from.

SilverDave 08-11-2005 01:08 PM

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¬* Re your "leak" .............................You can tighten up the exhaust stud nuts¬* with¬* a small box wrench ... They should be "Torqued "¬* to 12 ft lbs, or whatever it is [img]/forums/images/emoticons/cool.gif[/img].. but you cannot easily get a socket on a torque wrench¬* ¬*in there, without¬* removing the fairing and crash bars ... UGH !¬* [img]/forums/images/emoticons/mad.gif[/img]¬* ¬*¬* ¬*¬* ¬*I use a small¬* 4 inch flat box wrench.. and tighten them "Thumb Tight "¬* which is about as much as I can easily apply with¬* just a single digit.. not even two ... there is a crush gasket in there , which you are tightening the headers to ..... I have cured several "Exhaust leaks "¬* by this simple gentle¬* tightening .......¬* a slightly rich carb, and a leaky exhaust will¬* indeed cause a backfiring ......¬* ¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* ¬*¬* Re Balancing :¬* a good mech has the¬* manometers to cleanly balance your carbs.. and around here, I have had that job done for less than $50¬*¬*SilverDave¬*[img]/forums/images/emoticons/emoticonsxtra/cooldj.gif[/img]

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