Hello, I'm new here.
My dad has a 1992 CBR 900rr, and he got a Yoshimura slip-on on it (I think its a rs3, but I'm not sure, as I've never seen one like that, at least not with the same plate
" Yoshimura
R&D something
Not for road use")
The shop where the exhaust was fitted, my dad told me, they fiddled" with it ( "afinaram-na" in portuguese), but I don't know what they did to it, but they sais it gave the bike 7hp more.
The bike doesn't have" cats, never had.
My dad bought it when it came out, rode it some years, left it asside for arround 20 years, and now, I'm grown, and he wanted me to experience it. We took the gas out of the tank, as it was left there, and we sent it to a shop to make it work. It came back working, but idk what they did to it. When he took me for a ride, I noticed that everytim we deaccelerated the bike made lots and lots of pops from the exhaust, barely audible when riding thaks to windo noise, but one time I took my phone with me ans recorded the sound. Its not just 3 or 5 as someone sais before, it make pops as long as we are deaccelerating, and it makes them various times a second.
I thought it was pretty cool and didn't worry about it, as the mechanics said they had "fiddled" with it (idk if fiddle is the right word to use, as I want to say tune, but idk if I can say that with a carburated engine). I just started worrying about this right now, as I read all the entries in this thread when I was looking for a way to make my frien's duje 125 do exactly that.
So, I just want to know if those pops and bangs (which I love) hurt the engine in any way. Not because of the bang itself but, as said before, if the engine is running lean or something.
My dad almost doesn't ride it, and when he does he takes me with him, ans we go for about a 15 min. ride.
I love the pops, the bangs and the great deep loud sound the bike+exhaust procuce, so if it doesn't harm the engine, I'm not foing to change it.
I'm sorry if I was to boring explaining things that might be irrelevant for you, but I want to make sure that everything that has happened is understood and so maybe someone can give me an answer.