I ride a Harley Davidson Road King, I noticed last weekend when I was riding down Sutton Bank on my way home from the Farmyard that I was hearing some fairly loud back firing from the exhausts . I was in a low gear for the gradient of the hill, not sure if this is normal or if there is something wrong ? Can anyone help with advice please.
Many thanks in advance
I don't think you have a serious problem there BK
It sounds like unburned fuel igniting in the exhaust on the "over-run"
Which can happen in prolonged deceleration
As you were on Sutton Bank that is a very likely place for it to show up
I assume that this was a "rare" event (backfiring) for you and your bike
If its not doing when you "shut off" normally I wouldn't worry
But there are plenty of HD "experts" on here so I may be proved wrong
bluesbiker In: Birmingham in th
Posts: 2510
Karma:
Exactly wot emzed sed
you'll hear it mainly when sports bikes are shutting off for cornirs and coming down the box when engine is on over run. just build up of fuel in chamber. if exhaust was short enough you'd get flames as well. now there's an idea.
As above (bluesbiker) That's my fav way of "discouraging" Boy (or girl) racers, driving too close in slow Moving tragic (in town) Even better in a tunnel with a big twin, Am sure this is why I keep melting the Right side of my number- plate and indicator :-))
Is it the rotary engined Mazda apriliamad
Rotary engines are well known for serious over-run detonations as they only really like to rev, not slow down
I've seen the "factory" Norton's shooting a foot or more of flames out the back
Sure made the following riders "back off" into the hairpin
Wicked mate
Trust a biker to go for sumat "out the ordinary"
I'd love to put that lump in an outfit
I think rear tyres might not last very long
But it would be great fun while they lasted
Sorry BK for "hijacking" your thread
There you have it BK
In a "nutshell" if it's only happened the once (or very rarely)
Then in all probability it's what I said in the earlier post
Unburnt fuel igniting in the exhaust
As Wierdoraptor says though, you can get similar symptoms
(If it is happening on a regular basis)
When you have a "leaky" exhaust system which will draw air in on the "overrun"
(There are a few "technical" explanations for this phenomena, but you don't need to know them)
So "I" don't think you need to worry
Hope this helps to put your mind at rest
Hi Bobkat, My T100 Bonnie does it as well, it's got aftermarket pipes on and it sounds "Magnificent" yar. I agree with all that has been siad, unburnt fuel in the exhaust system, absolutely correct! Mark Possum51181
my sportster does it too on deceleration sometimes, i love it - i thought maybe it was due to "leaky" exhaust system bt from reading above i guess it would do it all time if this was case.
which pipes have you got on your beastie BK? xx
Unburnt fuel in the exhaust system shouldn't be normal - it might sound good occassionaly - but I'd be checking other things with suspicion. Could be a weak ignition coil, lead or plug , if it happens at start up?
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