Hello..I'm back this site has helped me alot and I thank you all..my newest issue is backfire when I release the throttle..it started off low but is getting lots worse..where I live harley shops won't touch it cuz it's not a harley any suggestions on my problem..I've heard I will always have this problem doto bigdog having crappy exhaust..but damn it sounds so good
backfire issues
- Thread starter kninekid
- Start date
FrankBDPS
Well-Known Member
Tell who ever told you big dogs have crappy exhaust to go fuck themselves. Then look at installing new gaskets where you're pipes bolt onto the motor. There used to be a post on here about this issue. Also when you back off the throttle make sure you let the throttle go closed completely. Mine has the origional style Kerker Supertrap exhaust on it and does not backfire. Good luck.
FrankBDPS
Well-Known Member
http://tech.bareasschoppers.com/exhaust/decel-popping-causes-solutions/
This is a good read on the subject. Good luck.
This is a good read on the subject. Good luck.
SKOGDOG
One of the old ones.
I just got done reading that article...great post. Thanks, FrankBDPS
Ok so I went to check exhaust finds and found I had a nut missing and all others lose and it did cause some wear on my rings but I tightened up the nuts and replaced the missing one untill I can find rings and much better very little back for but I have to keep in mind I'm straight piped..thanx for your help once again
You can find exhaust gaskets at any bike shop they are all the same. If you can't find them in you area, PM me you address and I'll send you a couple.
Carlos
pauldeepsea
Guru
Appreciate the follow up to the problem. Too many people leave out when they find the answer!
Your solution may be the answer to someone else's problem !
Your solution may be the answer to someone else's problem !
Peckerwood
Active Member
Harley exhaust gaskets work just fine. And if your backfiring issues continue, go to the S&S website, watch the video and tune your carb if you have one.
Yes I have a carb and I'm pretty sure it needs tuned but I've never been a carb guy and like I said ask the Harley shops around here good themselves above me to the point I don't know if I'll ever buy a harley I've talked to 6 different shops in this state and all want nothing to do with me or my bike cuz I'm not cool enough
Peckerwood
Active Member
I get the exact same shitty attitude from the harley shops around here, but here's the deal-FUCK 'EM, you don't need them. I'm not a carb guy myself. As a matter of fact, in all honesty, my mechanical skills are quite limited. That being said, though, I am 100% capable of doing the S&S carb tuning after watching the video. So do yourself a favor and check the video out, it's not rocket science; really quite easy, even for me. There are several possible causes for a backfire condition, and in my opinion, an untuned carb is probably the most likely cause as well as the easiest fix. Start with the easy shit first. And tell us where you're located, I'm sure the guys on this site can steer you to a good local independent shop.
Peckerwood
Active Member
Can anybody recommend a shop in the wastelands of eastern Utah?
Peckerwood
Active Member
Here ya go-happy tuning !
Fuk'em only if you know some theory... Whack the crap theory. Here is my 2-bird kill with carb and pipe.
Carb first. Look at my low speed screw position. If I am on the air cleaner side I am an air screw. If I am on the head side, I am a gas needle. Air cleaner side, I can only close air to begin with. Now I can walk up to any carb, know my gas from air screw... Air is how much I set the bubbles to break apart the gas droplets. Gas side, I am letting in the gas via a faucet.
Pipe and pop goes the Penultimate. When I have the bike sitting in the garage, what is the pressure inside the pipe? 14.7 psi/1 atmosphere = The Penultimate Number. Without this number connecting the dots you are fuked with every diagnostic move is a lot of guessing, unless you place the Penultimate front and center.
When I WOT the throttle and lift, what is the backpressure number? What number is heading back into the end of that pipe? 14.7 Penultimate Says I. So you have to ask the 2 killer bird question, did we bang cold into hot? Is supersonic the bang, or did those muffler spacers sort of slowed down the sonic? Straight in is super, you still hear the pop so sonic is still the wave thru the spacers, yes?
So cold vs. hot is even money, right? Now add fuel like the pwcomder says is fill the first two lines so this richens the lean on lift. Now you add oxygen is backpressure heading back in, and this more or less, chemically heats up the cold air is it keeps lighting off with the oxygen entering - as subtle pop.
Two riding thoughts.
1. Theory wise, I understand air is pop is a thunder cloud effect inside the pipe, means cold meets hot.
2. Novice wise, whaaaaa, my pop is I need to waste more gas, I already have the correct amount of gas entering, but I want to keep wasting gas is that pop needs to shut up?
Who's crying? There's no crying in loud bike is my ride.
bigdog2003
Member
FYI. You can download a carb tuning guide straight off the S&S web site.
I build a motherboard, i have two ways to play with parts. Mono-stable means one shot like a coil to fire off. I only use 1 resistor, 1 capacitor, 1 timer. If I want to run a-stable, I use 2 resistors, one capacitor, one timer. This shows I can keep the flow going, but can ground the capacitor in a controlled flip-flop, whereas, my single resistor is going to slowly or quickly fill my capacitor, then I immediately flip-flop to ground in mono is one after the other. Meaning, let's look at a digital clock. Tick-tick-tick is mono is one shot right after the other. The a-stable is to keep the clock number digitally set is the capacitor holding that number until the flip-flop dumps the capacitor of that number, here is the new a-number 60 mono hits later.
Something in the box is burnt. No wires were either out of a connector, corroded enough to not flow, wire out of connector is none of them. So as was shown with some other e-box thread, you could see the burnt timer thru the semi-clear-bake>>> was the failure of one of 3 components.
Look at how you now have to be computer savvy to understand the failure of the black box. I blow 1 of 3 ways... See the cashier.
Something in the box is burnt. No wires were either out of a connector, corroded enough to not flow, wire out of connector is none of them. So as was shown with some other e-box thread, you could see the burnt timer thru the semi-clear-bake>>> was the failure of one of 3 components.
Look at how you now have to be computer savvy to understand the failure of the black box. I blow 1 of 3 ways... See the cashier.
I build a motherboard, i have two ways to play with parts. Mono-stable means one shot like a coil to fire off. I only use 1 resistor, 1 capacitor, 1 timer. If I want to run a-stable, I use 2 resistors, one capacitor, one timer. This shows I can keep the flow going, but can ground the capacitor in a controlled flip-flop, whereas, my single resistor is going to slowly or quickly fill my capacitor, then I immediately flip-flop to ground in mono is one after the other. Meaning, let's look at a digital clock. Tick-tick-tick is mono is one shot right after the other. The a-stable is to keep the clock number digitally set is the capacitor holding that number until the flip-flop dumps the capacitor of that number, here is the new a-number 60 mono hits later.
Something in the box is burnt. No wires were either out of a connector, corroded enough to not flow, wire out of connector is none of them. So as was shown with some other e-box thread, you could see the burnt timer thru the semi-clear-bake>>> was the failure of one of 3 components.
Look at how you now have to be computer savvy to understand the failure of the black box. I blow 1 of 3 ways... See the cashier.
NO SAVVY, WHAT THE FUCK DOES THIS HAVE TO DO WITH TUNNING A CARBURATOR duh your are the shits
Carlos
Something in the box is burnt. No wires were either out of a connector, corroded enough to not flow, wire out of connector is none of them. So as was shown with some other e-box thread, you could see the burnt timer thru the semi-clear-bake>>> was the failure of one of 3 components.
Look at how you now have to be computer savvy to understand the failure of the black box. I blow 1 of 3 ways... See the cashier.
NO SAVVY, WHAT THE FUCK DOES THIS HAVE TO DO WITH TUNNING A CARBURATOR duh your are the shits
Carlos