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Yoshimura Hepta low mount

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12K views 47 replies 13 participants last post by  mcclsha  
#1 ·
#25 ·
That's a bad idea. There's a reason nobody puts aluminum plugs in exhausts! Ideally it should match the material the pipe is made of...so steel if it's a steel exhaust, or titanium if it's a titanium exhaust. Aluminum has a larger coefficient of thermal expansion and when it gets up to over 500 degrees which is very common for exhaust pipes it could put a lot of pressure on those thin-walled bungs and potentially crack it. Then you mess up a $1500 exhaust because you're trying to save 15 grams of weight. Also depending on the location of the bung hole, and if you're reving the hell out of the bike (think GSXR squids at a bike night), you could be flirting with temperatures near the melting point of aluminum and then you have bigger problems. Not as likely to happen, but it's a possibility. Another reason is aluminum is soft and those bungs tend to get pretty jammed in there after a while so you'll have a higher chance of rounding off the plug with the wrench when you're trying to take it off.

My opinion....stick with stainless. Save those few grams elsewhere. Of all exhaust brands I've ever seen and installed on bikes over the years that came with bung plugs or adapters, I've never seen a single one made out of aluminum.
 
#26 ·
Jeez sure seems like no one at Yosh tried to install this bracket before sending these out the door because that top bolt is impossible.

And it's really impossible to get a torque wrench on the nuts, so second the approach of using a smaller bolt and loctite here. Really annoying considering they're the ones who decided to mount it to the footpeg bolts, ones I'd really rather have torque'd to spec....
 
5
#27 ·
kaanivore said:
Jeez sure seems like no one at Yosh tried to install this bracket before sending these out the door because that top bolt is impossible.

And it's really impossible to get a torque wrench on the nuts, so second the approach of using a smaller bolt and loctite here. Really annoying considering they're the ones who decided to mount it to the footpeg bolts, ones I'd really rather have torque'd to spec....
Click to expand...
Pics would be helpful. 😁😎
 
#28 ·
@kaanivore @sbk1198 and i installed it in like 10 minutes strapped to the dyno !! @Pmack I don't think had a issues? and everyone else who got one didn't say anything :unsure: it's deff not easy, but we did no prob!! and to add, i put new rearsets on the bike and had to remove and reinstall them same fasteners ! having the right tools helps as well !
 
#29 ·
Yeah I got it after I stepped back and found the thinner wrenches, it's totally doable just was a pain for me and no way to use a torque wrench on the hex nuts as they're right behind the swingarm which is why I was moaning (I got some pics and will post). Also I got big gorilla fingers which doesn't help 👀.

But yeah shouldn't dissuade anyone because the end result is literally my fave exhaust ever on any bike :cool:

@SCracing did you install it with the OEM pegs on?
 
#31 ·
kaanivore said:
Yeah I got it after I stepped back and found the thinner wrenches, it's totally doable just was a pain for me and no way to use a torque wrench on the hex nuts as they're right behind the swingarm which is why I was moaning (I got some pics and will post). Also I got big gorilla fingers which doesn't help 👀.

But yeah shouldn't dissuade anyone because the end result is literally my fave exhaust ever on any bike :cool:

@SCracing did you install it with the OEM pegs on?
Click to expand...
Never mind, I realize I was being thick - I installed the bracket on while trying to keep the footpegs on the bike (i.e one bolt at a time) but obviously you could just take the assembly off the bike to install the bracket...did this at the tail end of working all July 4th weekend and clearly my mental faculties were spent!

I took the bike out for a test drive and can't stress enough how much I love this exhaust. It spits a long flame out on overrev, and generally has this great neutral tone that's not as boomy as the Graves exhaust (which isn't my style). But once you get it up in the rev range it will start to get raw and metallic, kind of like a Jag or Ferrari, and the upshifts sound downright demonic. I swear it's slightly quieter than the Graves slip-on as well, somehow, which I like as I'm mostly using this to commute at the moment (I've obviously got the DB-killer still in there). Thank you to @SCracing for supplying me with this!

Going to get this dyno tuned in a few weekends, and can't wait!
 
#32 ·
Just got back some really exciting news. This is directly from Yoshi:

Hello Shawn,

We actually just had the new ZX4RR in for fitment checks and product development.

We will be posting on the Yoshimura website the new parts (exhaust and fender kit) we will be making for this model soon.

That is when it will show the pricing and the availability on them too.

At the moment, there are no Yoshimura exhausts for the new ZX4RR yet. Although some people have installed the exhausts from the ZX25R on the 400.

The problem is, that the 250 exhaust most like has smaller header tubes, and does not produce as much power as the 400 could make with the correct sized exhaust.

Hopefully both Yoshimura Japan, and Yoshimura R&D (USA) will be getting some exhausts developed for the new 400 soon. Then they will be posted on the Yoshimura website.

Hope this helps with your questions.

Thank you,
 
#35 ·
misnblu said:
A couple of hp at the top end for me won't be a big deal as I'm not racing nor being competitive with this bike. 😉

I will however enjoy the symphony of the exhaust fitted to my 4RR even though it's intended for the 25R.
Thanks for the great comments @mcclsha.
That really got me excited for having it. 🥰👍
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No prob. I agree, there probably isn’t a ton of difference and I’m just hoping the new one makes it a tad easier for oil changes. I did see @SCracing ‘s video though showing it was possible so that was awesome and helpful!
 
#39 ·
@Ditchpig what catching up ? the parts for the 25 have been in circulation since 2020 and i made the move to get most of the needed parts here before the bike hit the show room floors ! now there are a few parts that "businesses" here are either trying to develop and make in house or rebranding things from China and selling. there ISN'T anything i can't get for the bike right now fellow canuk ! if the consumer wants to wait, then he'll wait while the rest of us enjoy what's available NOW !
 
#43 ·
Image

Got the Yoshi Hepta full titanium put on last night. Took it out for the first time today. It sounds (and looks) amazing. I did extend the O2 sensor but smells like it may be running a little rich. Will it take a little time for the computer to adjust or do you guys think it won’t be as good as a tune? I want to avoid doing anything that may void my warranty but obviously want to make sure it’s running right as well.
 
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