fairorth Posted January 5, 2015 Share Posted January 5, 2015 I got my Yoshimura (CF) put on this weekend. I've noticed that now on abrupt off-throttle action, the bike will backfire a bit. Small popping sound, nothing terrible but the stock exhaust did not do that. Normal? My bike history ----------------- 82 VT-500 Ascot 86 VFR Interceptor 04 MV Agusta F4 Brutale S (750) 10 Street Triple R 15 FZ-07 (arrived 12/6/2015)!! Link to comment Share on other sites More sharing options...
Premium Member jake Posted January 5, 2015 Premium Member Share Posted January 5, 2015 My vote is NORMAL. 2015 FZ-07 2003 2014 GSXR 1000 Link to comment Share on other sites More sharing options...
Guest Ralph Posted January 5, 2015 Share Posted January 5, 2015 Check for any leaks in the exhaust system, Link to comment Share on other sites More sharing options...
Cruizin Posted January 5, 2015 Share Posted January 5, 2015 This is perfectly normal, happens when we change exhausts. Its the air being pushed into the exhaust chamber by the emmisons air pump. You can order block off plates or just plug off the hose from the air pump. Im sure that someone on here has done so on the fz07 and will chime in. I got my Yoshimura (CF) put on this weekend. I've noticed that now on abrupt off-throttle action, the bike will backfire a bit. Small popping sound, nothing terrible but the stock exhaust did not do that. Normal? Yamaha MT-10 ForumYamaha Tracer 900 Forum Yamaha Ténéré 700 Forum Link to comment Share on other sites More sharing options...
shadowcat Posted January 5, 2015 Share Posted January 5, 2015 Yeah my delk exhaust pops quite a bit I think it sounds cool. Link to comment Share on other sites More sharing options...
YZEtc Posted January 5, 2015 Share Posted January 5, 2015 Don't think the FZ-07 has an air pump for emissions. Link to comment Share on other sites More sharing options...
FZRDR Posted January 5, 2015 Share Posted January 5, 2015 This is perfectly normal, happens when we change exhausts. Its the air being pushed into the exhaust chamber by the emmisons air pump. You can order block off plates or just plug off the hose from the air pump. Im sure that someone on here has done so on the fz07 and will chime in. I remember reading the FZ-07 did not have back off plates like the FZ-09? Link to comment Share on other sites More sharing options...
FZRDR Posted January 5, 2015 Share Posted January 5, 2015 YZetc, ya beat me to it! Link to comment Share on other sites More sharing options...
YZEtc Posted January 5, 2015 Share Posted January 5, 2015 Happens. Link to comment Share on other sites More sharing options...
FZRDR Posted January 5, 2015 Share Posted January 5, 2015 It's my dang typing skills, slows me down.... (rofl)" Link to comment Share on other sites More sharing options...
Premium Member motomeek Posted January 6, 2015 Premium Member Share Posted January 6, 2015 Totally normal. I'm a fan of it. Instagram: @meekmade | You don't need to flat foot a bike to ride it. Link to comment Share on other sites More sharing options...
Premium Member hobbs Posted January 6, 2015 Premium Member Share Posted January 6, 2015 Dobeck said somewhere that the cause of that is air being pulled into the exhaust inbetween firing pulses. Fresh oxygen, heat and unspent fuel vapors combine to create the popping. They called it... reversion. Everything went braap. Link to comment Share on other sites More sharing options...
Cruizin Posted January 6, 2015 Share Posted January 6, 2015 Some kinda like the sound. Yamaha MT-10 ForumYamaha Tracer 900 Forum Yamaha Ténéré 700 Forum Link to comment Share on other sites More sharing options...
YZEtc Posted January 6, 2015 Share Posted January 6, 2015 I believe this happens even with the stock exhaust, but is more muffled. Link to comment Share on other sites More sharing options...
fairorth Posted January 6, 2015 Author Share Posted January 6, 2015 See, that's what I was thinking. That the large chambers of the stock exhaust masked the sound. OK, cool. I was thinking I may have left out a part .... I do love the new rumble, huge grin now hitting the start button! My bike history ----------------- 82 VT-500 Ascot 86 VFR Interceptor 04 MV Agusta F4 Brutale S (750) 10 Street Triple R 15 FZ-07 (arrived 12/6/2015)!! Link to comment Share on other sites More sharing options...
Premium Member GAZ Posted January 6, 2015 Premium Member Share Posted January 6, 2015 It's normal. It's your bike's way of crying because you're getting off the throttle. I have Akra with baffle removed and some people say (that have this setup) it does it often... mine does it rarely. Maybe they don't have a fuel controller. I like it though wish mine did it more. Link to comment Share on other sites More sharing options...
coleman67 Posted January 6, 2015 Share Posted January 6, 2015 It's normal. It's your bike's way of crying because you're getting off the throttle. I have Akra with baffle removed and some people say (that have this setup) it does it often... mine does it rarely. Maybe they don't have a fuel controller. I like it though wish mine did it more. Interesting. It has always been my impression that this sort of popping coming off throttle was a result of a lean condition with the fuel mixture. That's why we check for air leaks - right ? Lean = Hot = Bad. So, in my mind, installing a fuel controller and enriching the mixture would possibly decrease the popping - just like rejetting carbs would do. But isn't that what the O2 sensor does? Somebody set me straight! Link to comment Share on other sites More sharing options...
Guest Ralph Posted January 7, 2015 Share Posted January 7, 2015 The popping is usually due to un-burnt fuel in the exhaust, if air then gets into the exhaust from air leaks or air injection that fuel then burns and you get the popping. My 07 don't do it on the standard exhaust but my old Morini sounds like the gun fight at the OK corral on the overrun. Link to comment Share on other sites More sharing options...
Premium Member GAZ Posted January 7, 2015 Premium Member Share Posted January 7, 2015 @ralph and @hobbs got it correct. Reversion. The configurations of the Dobeck are awesome so you could feed it more fuel during a certain stage and in that case it might have left over gases. My comment was directed to the Akra setup and if there was no fuel controller, the misconfiguration of the air/fuel might do this as well. However, I can't speak on behalf of Akra without db and no fuel controller as I do have a fuel controller setup in mine. Link to comment Share on other sites More sharing options...
JA50N Posted February 21, 2015 Share Posted February 21, 2015 If it really bothers you, try hi-temp RVT at the exhaust joints to stop any fresh air from being pulled in. If mine does it, that is what I am going to try. Link to comment Share on other sites More sharing options...
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