Ducati Monster Forum

Moto Board => Tech => Topic started by: JDIRECTORJ on July 12, 2017, 07:53:41 AM

Title: Backfire
Post by: JDIRECTORJ on July 12, 2017, 07:53:41 AM
Hello,
I'm getting a decent amount of backfire when decelerating. I have termi slip-ons. I understand that there is some backfiring expected but I feel like it's every time the rpm's drop. I know we all love the sound but it's a bit much for city riding with the echo off the building and all.

Any ideas how I can reduce this?
Title: Re: Backfire
Post by: koko64 on July 12, 2017, 09:25:44 AM
Which model do you have?
Exhaust leaks and incorrect AF ratio for the bikes modifications can cause bad back firing.
Title: Re:
Post by: Buhgaboo on July 12, 2017, 09:39:30 AM
Check your valves.... (closers)closer to their tightest tolerance the quieter they become...when it's really really loud do a leakdown test...valve could be fried

Sent from my Pixel XL using Tapatalk
Title: Re: Backfire
Post by: JDIRECTORJ on July 12, 2017, 09:28:36 PM
Quote from: koko64 on July 12, 2017, 09:25:44 AM
Which model do you have?
Exhaust leaks and incorrect AF ratio for the bikes modifications can cause bad back firing.

AF ratio? It's a 2014 monster 1200s with 4K miles on it. Slip one with baffles.
Title: Re: Backfire
Post by: JDIRECTORJ on July 12, 2017, 09:29:39 PM
Quote from: Buhgaboo on July 12, 2017, 09:39:30 AM
Check your valves.... (closers)closer to their tightest tolerance the quieter they become...when it's really really loud do a leakdown test...valve could be fried

Sent from my Pixel XL using Tapatalk

Leak down test? I think I might need to take her in. This is starting to sound a little out of my expertise.
Title: Re: Backfire
Post by: ducpainter on July 13, 2017, 03:20:08 AM
I wouldn't get too excited, just yet.

It's most likely a leak, combined with the ridiculously lean settings the stock ecu is running.

Check it for a leak and go from there.
Title: Re: Backfire
Post by: Howie on July 13, 2017, 05:08:12 AM
Quote from: ducpainter on July 13, 2017, 03:20:08 AM
I wouldn't get too excited, just yet.

It's most likely a leak, combined with the ridiculously lean settings the stock ecu is running.

Check it for a leak and go from there.

Yep.  Combination of easy, cheap and most likely.  Plus no mention of misfire.