Loud popping back fire

[aspen874]

Sven thank you for taking your time to help Cruz out

 

[Mickeetwo]

Check and make sure you didn't accidently swap the spark plug wires.

 

[Mikeinjersey]

Outside possibility, by chance did you remove and replace your exhaust pipes during the cleaning? If so you may have given yourself a vacuum leak . Also with your rerouting the wires maybe you have a loose connection or actually broke one of the wires you said were worn . A wire can be fractured inside without external evidence. Retrace your steps and check closely.

 

[Cruz Dog]

Wires seem ok how do I check vacuum leak on exhaust

 

[Mikeinjersey]

At the exhaust flanges spray with a soapy solution before you start the bike. Start the bike and look for bubbles or any sign of an air leak. Another method is to put a light ribbon near the flange to see if air hits moves it. At a shop they may have a smoke machine which they use to blow smoke backwards through the system to look for where it may be coming out.
Your original statement sounded to me like you thought you caused the problem during cleaning the bike. I read it again and now I'm not clear on if this was an existing problem prior to you cleaning.
If you didn't remove the pipes for cleaning and cause a possible air leak go back to possible fuel/air/ignition problems. Air leaks on the intake side also cause backfires.
Your comment in #18 would make me look at ignition first. To go from firing on one cylinder to running fine doesn't add up with starving for fuel. If you had a cylinder with intermittent firing you would get the backfire . Your reference to worn wires definitely seems like a place to focus.

 

[Cruz Dog]

Yes it started giving me problems in September just hadn’t had much tune to mess With it. I was only during at idle and not running properly. After looking at exhaust I’m thinking that’s what’s causing the popping. Still dying out. Gonna hook it up to protunes tomorrow or Tuesday. Thanks for all the help o all. Got a mechanic gonna help me out with it but now we have good references

 

[Mikeinjersey]

When you say "looking at exhaust" do you mean you had the pipes off? If so you need new gaskets. The likelihood of an air leak is high if you don't replace them. When you become confident that your fuel system( EFI) is functioning properly I found the following info online. It may help you diagnose further. Good luck and let us know what your mechanic finds to be the source of the problem.

Air Leaks: Any source of fresh air into the exhaust system can create or worsen the conditions that bring about exhaust backfiring. The most common entry point is the junction of the header pipes and mufflers. Even a small air leak can dramatically increase the intensity or likelihood of exhaust system backfiring. Ignition: If exhaust system popping is very loud, irregular and accompanied by loss of power, then you should suspect that the ignition system is not performing as it should. If, for some reason, the ignition sometimes fires at the wrong time, then exhaust popping can become very energetic (loud). Look for failing high tension leads (plug wires), failing ignition coil(s) and especially switches or connectors as possible causes.

 

[Cruz Dog]

Awesome sir really appreciate it. I did put new gaskets went with the tapered ones. Maybe I didn’t put it correctly. Does the tapered end go towards the engine or the exhaust?

 

[Mikeinjersey]

Awesome sir really appreciate it. I did put new gaskets went with the tapered ones. Maybe I didn’t put it correctly. Does the tapered end go towards the engine or the exhaust?

Good. The tapered end goes toward the pipe, flat end goes in the head. By the way, easy to screw up so if you don't find another reason for your backfiring don't discount that you may have damaged the gasket on the way in.
From your description my guess for your problem is in the wiring or ignition system. Especially since you said it was firing on one cylinder. I hope you and the mechanic have some good luck .

 

[Mikeinjersey]

Hey Cruz, this is something I came across that you may find interesting.
A bad crank position sensor can worsen the way the engine idles, or the acceleration behavior. If the engine is revved up with a bad or faulty sensor, it may cause misfiring, motor vibration or backfires. Acceleration might be hesitant, and abnormal shaking during engine idle might occur. In the worst case the car/bike may not start.
Unfortunately, a lot of stuff can cause an issue with your symptoms .

 

[Cruz Dog]

Well got the Mastiff running no more popping stays running. I replaced the ignition one of the relays was bad out in a new battery and she’s starting gonna put air intake back on and take her for a ride. Only thing is I screwed with the screw for the idle so gonna have to do some fine tuning. Have any of ya ever messed with this little sucker?B